1326 lines
34 KiB
C
1326 lines
34 KiB
C
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/*
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* VMware Balloon driver.
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*
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* Copyright (C) 2000-2014, VMware, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License and no later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained by: Xavier Deguillard <xdeguillard@vmware.com>
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* Philip Moltmann <moltmann@vmware.com>
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*/
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/*
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* This is VMware physical memory management driver for Linux. The driver
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* acts like a "balloon" that can be inflated to reclaim physical pages by
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* reserving them in the guest and invalidating them in the monitor,
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* freeing up the underlying machine pages so they can be allocated to
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* other guests. The balloon can also be deflated to allow the guest to
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* use more physical memory. Higher level policies can control the sizes
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* of balloons in VMs in order to manage physical memory resources.
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*/
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//#define DEBUG
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/vmw_vmci_defs.h>
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#include <linux/vmw_vmci_api.h>
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#include <linux/io.h>
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#include <asm/hypervisor.h>
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MODULE_AUTHOR("VMware, Inc.");
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MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
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MODULE_VERSION("1.5.0.0-k");
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MODULE_ALIAS("dmi:*:svnVMware*:*");
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MODULE_ALIAS("vmware_vmmemctl");
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MODULE_LICENSE("GPL");
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/*
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* Various constants controlling rate of inflaint/deflating balloon,
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* measured in pages.
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*/
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/*
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* Rates of memory allocaton when guest experiences memory pressure
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* (driver performs sleeping allocations).
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*/
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#define VMW_BALLOON_RATE_ALLOC_MIN 512U
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#define VMW_BALLOON_RATE_ALLOC_MAX 2048U
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#define VMW_BALLOON_RATE_ALLOC_INC 16U
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/*
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* When guest is under memory pressure, use a reduced page allocation
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* rate for next several cycles.
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*/
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#define VMW_BALLOON_SLOW_CYCLES 4
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/*
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* Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't
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* allow wait (__GFP_RECLAIM) for NOSLEEP page allocations. Use
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* __GFP_NOWARN, to suppress page allocation failure warnings.
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*/
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#define VMW_PAGE_ALLOC_NOSLEEP (__GFP_HIGHMEM|__GFP_NOWARN)
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/*
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* Use GFP_HIGHUSER when executing in a separate kernel thread
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* context and allocation can sleep. This is less stressful to
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* the guest memory system, since it allows the thread to block
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* while memory is reclaimed, and won't take pages from emergency
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* low-memory pools.
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*/
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#define VMW_PAGE_ALLOC_CANSLEEP (GFP_HIGHUSER)
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/* Maximum number of refused pages we accumulate during inflation cycle */
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#define VMW_BALLOON_MAX_REFUSED 16
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/*
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* Hypervisor communication port definitions.
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*/
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#define VMW_BALLOON_HV_PORT 0x5670
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#define VMW_BALLOON_HV_MAGIC 0x456c6d6f
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#define VMW_BALLOON_GUEST_ID 1 /* Linux */
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enum vmwballoon_capabilities {
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/*
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* Bit 0 is reserved and not associated to any capability.
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*/
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VMW_BALLOON_BASIC_CMDS = (1 << 1),
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VMW_BALLOON_BATCHED_CMDS = (1 << 2),
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VMW_BALLOON_BATCHED_2M_CMDS = (1 << 3),
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VMW_BALLOON_SIGNALLED_WAKEUP_CMD = (1 << 4),
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};
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#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_BASIC_CMDS \
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| VMW_BALLOON_BATCHED_CMDS \
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| VMW_BALLOON_BATCHED_2M_CMDS \
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| VMW_BALLOON_SIGNALLED_WAKEUP_CMD)
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#define VMW_BALLOON_2M_SHIFT (9)
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#define VMW_BALLOON_NUM_PAGE_SIZES (2)
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/*
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* Backdoor commands availability:
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*
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* START, GET_TARGET and GUEST_ID are always available,
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*
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* VMW_BALLOON_BASIC_CMDS:
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* LOCK and UNLOCK commands,
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* VMW_BALLOON_BATCHED_CMDS:
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* BATCHED_LOCK and BATCHED_UNLOCK commands.
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* VMW BALLOON_BATCHED_2M_CMDS:
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* BATCHED_2M_LOCK and BATCHED_2M_UNLOCK commands,
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* VMW VMW_BALLOON_SIGNALLED_WAKEUP_CMD:
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* VMW_BALLOON_CMD_VMCI_DOORBELL_SET command.
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*/
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#define VMW_BALLOON_CMD_START 0
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#define VMW_BALLOON_CMD_GET_TARGET 1
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#define VMW_BALLOON_CMD_LOCK 2
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#define VMW_BALLOON_CMD_UNLOCK 3
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#define VMW_BALLOON_CMD_GUEST_ID 4
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#define VMW_BALLOON_CMD_BATCHED_LOCK 6
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#define VMW_BALLOON_CMD_BATCHED_UNLOCK 7
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#define VMW_BALLOON_CMD_BATCHED_2M_LOCK 8
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#define VMW_BALLOON_CMD_BATCHED_2M_UNLOCK 9
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#define VMW_BALLOON_CMD_VMCI_DOORBELL_SET 10
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/* error codes */
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#define VMW_BALLOON_SUCCESS 0
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#define VMW_BALLOON_FAILURE -1
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#define VMW_BALLOON_ERROR_CMD_INVALID 1
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#define VMW_BALLOON_ERROR_PPN_INVALID 2
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#define VMW_BALLOON_ERROR_PPN_LOCKED 3
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#define VMW_BALLOON_ERROR_PPN_UNLOCKED 4
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#define VMW_BALLOON_ERROR_PPN_PINNED 5
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#define VMW_BALLOON_ERROR_PPN_NOTNEEDED 6
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#define VMW_BALLOON_ERROR_RESET 7
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#define VMW_BALLOON_ERROR_BUSY 8
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#define VMW_BALLOON_SUCCESS_WITH_CAPABILITIES (0x03000000)
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/* Batch page description */
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/*
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* Layout of a page in the batch page:
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*
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* +-------------+----------+--------+
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* | | | |
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* | Page number | Reserved | Status |
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* | | | |
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* +-------------+----------+--------+
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* 64 PAGE_SHIFT 6 0
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*
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* The reserved field should be set to 0.
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*/
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#define VMW_BALLOON_BATCH_MAX_PAGES (PAGE_SIZE / sizeof(u64))
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#define VMW_BALLOON_BATCH_STATUS_MASK ((1UL << 5) - 1)
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#define VMW_BALLOON_BATCH_PAGE_MASK (~((1UL << PAGE_SHIFT) - 1))
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struct vmballoon_batch_page {
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u64 pages[VMW_BALLOON_BATCH_MAX_PAGES];
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};
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static u64 vmballoon_batch_get_pa(struct vmballoon_batch_page *batch, int idx)
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{
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return batch->pages[idx] & VMW_BALLOON_BATCH_PAGE_MASK;
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}
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static int vmballoon_batch_get_status(struct vmballoon_batch_page *batch,
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int idx)
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{
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return (int)(batch->pages[idx] & VMW_BALLOON_BATCH_STATUS_MASK);
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}
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static void vmballoon_batch_set_pa(struct vmballoon_batch_page *batch, int idx,
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u64 pa)
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{
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batch->pages[idx] = pa;
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}
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#define VMWARE_BALLOON_CMD(cmd, arg1, arg2, result) \
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({ \
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unsigned long __status, __dummy1, __dummy2, __dummy3; \
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__asm__ __volatile__ ("inl %%dx" : \
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"=a"(__status), \
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"=c"(__dummy1), \
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"=d"(__dummy2), \
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"=b"(result), \
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"=S" (__dummy3) : \
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"0"(VMW_BALLOON_HV_MAGIC), \
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"1"(VMW_BALLOON_CMD_##cmd), \
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"2"(VMW_BALLOON_HV_PORT), \
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"3"(arg1), \
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"4" (arg2) : \
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"memory"); \
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if (VMW_BALLOON_CMD_##cmd == VMW_BALLOON_CMD_START) \
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result = __dummy1; \
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result &= -1UL; \
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__status & -1UL; \
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})
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#ifdef CONFIG_DEBUG_FS
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struct vmballoon_stats {
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unsigned int timer;
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unsigned int doorbell;
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/* allocation statistics */
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unsigned int alloc[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int alloc_fail[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int sleep_alloc;
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unsigned int sleep_alloc_fail;
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unsigned int refused_alloc[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int refused_free[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int free[VMW_BALLOON_NUM_PAGE_SIZES];
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/* monitor operations */
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unsigned int lock[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int lock_fail[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int unlock[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int unlock_fail[VMW_BALLOON_NUM_PAGE_SIZES];
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unsigned int target;
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unsigned int target_fail;
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unsigned int start;
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unsigned int start_fail;
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unsigned int guest_type;
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unsigned int guest_type_fail;
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unsigned int doorbell_set;
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unsigned int doorbell_unset;
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};
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#define STATS_INC(stat) (stat)++
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#else
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#define STATS_INC(stat)
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#endif
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struct vmballoon;
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struct vmballoon_ops {
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void (*add_page)(struct vmballoon *b, int idx, struct page *p);
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int (*lock)(struct vmballoon *b, unsigned int num_pages,
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bool is_2m_pages, unsigned int *target);
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int (*unlock)(struct vmballoon *b, unsigned int num_pages,
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bool is_2m_pages, unsigned int *target);
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};
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struct vmballoon_page_size {
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/* list of reserved physical pages */
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struct list_head pages;
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/* transient list of non-balloonable pages */
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struct list_head refused_pages;
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unsigned int n_refused_pages;
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};
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struct vmballoon {
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struct vmballoon_page_size page_sizes[VMW_BALLOON_NUM_PAGE_SIZES];
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/* supported page sizes. 1 == 4k pages only, 2 == 4k and 2m pages */
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unsigned supported_page_sizes;
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/* balloon size in pages */
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unsigned int size;
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unsigned int target;
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/* reset flag */
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bool reset_required;
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/* adjustment rates (pages per second) */
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unsigned int rate_alloc;
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/* slowdown page allocations for next few cycles */
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unsigned int slow_allocation_cycles;
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unsigned long capabilities;
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struct vmballoon_batch_page *batch_page;
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unsigned int batch_max_pages;
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struct page *page;
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const struct vmballoon_ops *ops;
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#ifdef CONFIG_DEBUG_FS
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/* statistics */
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struct vmballoon_stats stats;
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/* debugfs file exporting statistics */
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struct dentry *dbg_entry;
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#endif
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struct sysinfo sysinfo;
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struct delayed_work dwork;
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struct vmci_handle vmci_doorbell;
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};
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static struct vmballoon balloon;
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/*
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* Send "start" command to the host, communicating supported version
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* of the protocol.
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*/
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static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
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{
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unsigned long status, capabilities, dummy = 0;
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bool success;
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STATS_INC(b->stats.start);
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status = VMWARE_BALLOON_CMD(START, req_caps, dummy, capabilities);
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switch (status) {
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case VMW_BALLOON_SUCCESS_WITH_CAPABILITIES:
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b->capabilities = capabilities;
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success = true;
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break;
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case VMW_BALLOON_SUCCESS:
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b->capabilities = VMW_BALLOON_BASIC_CMDS;
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success = true;
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break;
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default:
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success = false;
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}
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/*
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* 2MB pages are only supported with batching. If batching is for some
|
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* reason disabled, do not use 2MB pages, since otherwise the legacy
|
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* mechanism is used with 2MB pages, causing a failure.
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*/
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if ((b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS) &&
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(b->capabilities & VMW_BALLOON_BATCHED_CMDS))
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b->supported_page_sizes = 2;
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else
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b->supported_page_sizes = 1;
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if (!success) {
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pr_debug("%s - failed, hv returns %ld\n", __func__, status);
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STATS_INC(b->stats.start_fail);
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}
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||
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return success;
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||
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}
|
||
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||
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static bool vmballoon_check_status(struct vmballoon *b, unsigned long status)
|
||
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{
|
||
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switch (status) {
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case VMW_BALLOON_SUCCESS:
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return true;
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||
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||
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case VMW_BALLOON_ERROR_RESET:
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b->reset_required = true;
|
||
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/* fall through */
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||
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|
||
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default:
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return false;
|
||
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}
|
||
|
}
|
||
|
|
||
|
/*
|
||
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* Communicate guest type to the host so that it can adjust ballooning
|
||
|
* algorithm to the one most appropriate for the guest. This command
|
||
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* is normally issued after sending "start" command and is part of
|
||
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* standard reset sequence.
|
||
|
*/
|
||
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static bool vmballoon_send_guest_id(struct vmballoon *b)
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||
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{
|
||
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unsigned long status, dummy = 0;
|
||
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|
||
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status = VMWARE_BALLOON_CMD(GUEST_ID, VMW_BALLOON_GUEST_ID, dummy,
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dummy);
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STATS_INC(b->stats.guest_type);
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||
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if (vmballoon_check_status(b, status))
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return true;
|
||
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|
||
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pr_debug("%s - failed, hv returns %ld\n", __func__, status);
|
||
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STATS_INC(b->stats.guest_type_fail);
|
||
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return false;
|
||
|
}
|
||
|
|
||
|
static u16 vmballoon_page_size(bool is_2m_page)
|
||
|
{
|
||
|
if (is_2m_page)
|
||
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return 1 << VMW_BALLOON_2M_SHIFT;
|
||
|
|
||
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return 1;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Retrieve desired balloon size from the host.
|
||
|
*/
|
||
|
static bool vmballoon_send_get_target(struct vmballoon *b, u32 *new_target)
|
||
|
{
|
||
|
unsigned long status;
|
||
|
unsigned long target;
|
||
|
unsigned long limit;
|
||
|
unsigned long dummy = 0;
|
||
|
u32 limit32;
|
||
|
|
||
|
/*
|
||
|
* si_meminfo() is cheap. Moreover, we want to provide dynamic
|
||
|
* max balloon size later. So let us call si_meminfo() every
|
||
|
* iteration.
|
||
|
*/
|
||
|
si_meminfo(&b->sysinfo);
|
||
|
limit = b->sysinfo.totalram;
|
||
|
|
||
|
/* Ensure limit fits in 32-bits */
|
||
|
limit32 = (u32)limit;
|
||
|
if (limit != limit32)
|
||
|
return false;
|
||
|
|
||
|
/* update stats */
|
||
|
STATS_INC(b->stats.target);
|
||
|
|
||
|
status = VMWARE_BALLOON_CMD(GET_TARGET, limit, dummy, target);
|
||
|
if (vmballoon_check_status(b, status)) {
|
||
|
*new_target = target;
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
pr_debug("%s - failed, hv returns %ld\n", __func__, status);
|
||
|
STATS_INC(b->stats.target_fail);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Notify the host about allocated page so that host can use it without
|
||
|
* fear that guest will need it. Host may reject some pages, we need to
|
||
|
* check the return value and maybe submit a different page.
|
||
|
*/
|
||
|
static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
|
||
|
unsigned int *hv_status, unsigned int *target)
|
||
|
{
|
||
|
unsigned long status, dummy = 0;
|
||
|
u32 pfn32;
|
||
|
|
||
|
pfn32 = (u32)pfn;
|
||
|
if (pfn32 != pfn)
|
||
|
return -EINVAL;
|
||
|
|
||
|
STATS_INC(b->stats.lock[false]);
|
||
|
|
||
|
*hv_status = status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy, *target);
|
||
|
if (vmballoon_check_status(b, status))
|
||
|
return 0;
|
||
|
|
||
|
pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
|
||
|
STATS_INC(b->stats.lock_fail[false]);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
static int vmballoon_send_batched_lock(struct vmballoon *b,
|
||
|
unsigned int num_pages, bool is_2m_pages, unsigned int *target)
|
||
|
{
|
||
|
unsigned long status;
|
||
|
unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page));
|
||
|
|
||
|
STATS_INC(b->stats.lock[is_2m_pages]);
|
||
|
|
||
|
if (is_2m_pages)
|
||
|
status = VMWARE_BALLOON_CMD(BATCHED_2M_LOCK, pfn, num_pages,
|
||
|
*target);
|
||
|
else
|
||
|
status = VMWARE_BALLOON_CMD(BATCHED_LOCK, pfn, num_pages,
|
||
|
*target);
|
||
|
|
||
|
if (vmballoon_check_status(b, status))
|
||
|
return 0;
|
||
|
|
||
|
pr_debug("%s - batch ppn %lx, hv returns %ld\n", __func__, pfn, status);
|
||
|
STATS_INC(b->stats.lock_fail[is_2m_pages]);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Notify the host that guest intends to release given page back into
|
||
|
* the pool of available (to the guest) pages.
|
||
|
*/
|
||
|
static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn,
|
||
|
unsigned int *target)
|
||
|
{
|
||
|
unsigned long status, dummy = 0;
|
||
|
u32 pfn32;
|
||
|
|
||
|
pfn32 = (u32)pfn;
|
||
|
if (pfn32 != pfn)
|
||
|
return false;
|
||
|
|
||
|
STATS_INC(b->stats.unlock[false]);
|
||
|
|
||
|
status = VMWARE_BALLOON_CMD(UNLOCK, pfn, dummy, *target);
|
||
|
if (vmballoon_check_status(b, status))
|
||
|
return true;
|
||
|
|
||
|
pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
|
||
|
STATS_INC(b->stats.unlock_fail[false]);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
static bool vmballoon_send_batched_unlock(struct vmballoon *b,
|
||
|
unsigned int num_pages, bool is_2m_pages, unsigned int *target)
|
||
|
{
|
||
|
unsigned long status;
|
||
|
unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page));
|
||
|
|
||
|
STATS_INC(b->stats.unlock[is_2m_pages]);
|
||
|
|
||
|
if (is_2m_pages)
|
||
|
status = VMWARE_BALLOON_CMD(BATCHED_2M_UNLOCK, pfn, num_pages,
|
||
|
*target);
|
||
|
else
|
||
|
status = VMWARE_BALLOON_CMD(BATCHED_UNLOCK, pfn, num_pages,
|
||
|
*target);
|
||
|
|
||
|
if (vmballoon_check_status(b, status))
|
||
|
return true;
|
||
|
|
||
|
pr_debug("%s - batch ppn %lx, hv returns %ld\n", __func__, pfn, status);
|
||
|
STATS_INC(b->stats.unlock_fail[is_2m_pages]);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
static struct page *vmballoon_alloc_page(gfp_t flags, bool is_2m_page)
|
||
|
{
|
||
|
if (is_2m_page)
|
||
|
return alloc_pages(flags, VMW_BALLOON_2M_SHIFT);
|
||
|
|
||
|
return alloc_page(flags);
|
||
|
}
|
||
|
|
||
|
static void vmballoon_free_page(struct page *page, bool is_2m_page)
|
||
|
{
|
||
|
if (is_2m_page)
|
||
|
__free_pages(page, VMW_BALLOON_2M_SHIFT);
|
||
|
else
|
||
|
__free_page(page);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Quickly release all pages allocated for the balloon. This function is
|
||
|
* called when host decides to "reset" balloon for one reason or another.
|
||
|
* Unlike normal "deflate" we do not (shall not) notify host of the pages
|
||
|
* being released.
|
||
|
*/
|
||
|
static void vmballoon_pop(struct vmballoon *b)
|
||
|
{
|
||
|
struct page *page, *next;
|
||
|
unsigned is_2m_pages;
|
||
|
|
||
|
for (is_2m_pages = 0; is_2m_pages < VMW_BALLOON_NUM_PAGE_SIZES;
|
||
|
is_2m_pages++) {
|
||
|
struct vmballoon_page_size *page_size =
|
||
|
&b->page_sizes[is_2m_pages];
|
||
|
u16 size_per_page = vmballoon_page_size(is_2m_pages);
|
||
|
|
||
|
list_for_each_entry_safe(page, next, &page_size->pages, lru) {
|
||
|
list_del(&page->lru);
|
||
|
vmballoon_free_page(page, is_2m_pages);
|
||
|
STATS_INC(b->stats.free[is_2m_pages]);
|
||
|
b->size -= size_per_page;
|
||
|
cond_resched();
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Clearing the batch_page unconditionally has no adverse effect */
|
||
|
free_page((unsigned long)b->batch_page);
|
||
|
b->batch_page = NULL;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Notify the host of a ballooned page. If host rejects the page put it on the
|
||
|
* refuse list, those refused page are then released at the end of the
|
||
|
* inflation cycle.
|
||
|
*/
|
||
|
static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages,
|
||
|
bool is_2m_pages, unsigned int *target)
|
||
|
{
|
||
|
int locked, hv_status;
|
||
|
struct page *page = b->page;
|
||
|
struct vmballoon_page_size *page_size = &b->page_sizes[false];
|
||
|
|
||
|
/* is_2m_pages can never happen as 2m pages support implies batching */
|
||
|
|
||
|
locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status,
|
||
|
target);
|
||
|
if (locked) {
|
||
|
STATS_INC(b->stats.refused_alloc[false]);
|
||
|
|
||
|
if (locked == -EIO &&
|
||
|
(hv_status == VMW_BALLOON_ERROR_RESET ||
|
||
|
hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED)) {
|
||
|
vmballoon_free_page(page, false);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Place page on the list of non-balloonable pages
|
||
|
* and retry allocation, unless we already accumulated
|
||
|
* too many of them, in which case take a breather.
|
||
|
*/
|
||
|
if (page_size->n_refused_pages < VMW_BALLOON_MAX_REFUSED) {
|
||
|
page_size->n_refused_pages++;
|
||
|
list_add(&page->lru, &page_size->refused_pages);
|
||
|
} else {
|
||
|
vmballoon_free_page(page, false);
|
||
|
}
|
||
|
return locked;
|
||
|
}
|
||
|
|
||
|
/* track allocated page */
|
||
|
list_add(&page->lru, &page_size->pages);
|
||
|
|
||
|
/* update balloon size */
|
||
|
b->size++;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int vmballoon_lock_batched_page(struct vmballoon *b,
|
||
|
unsigned int num_pages, bool is_2m_pages, unsigned int *target)
|
||
|
{
|
||
|
int locked, i;
|
||
|
u16 size_per_page = vmballoon_page_size(is_2m_pages);
|
||
|
|
||
|
locked = vmballoon_send_batched_lock(b, num_pages, is_2m_pages,
|
||
|
target);
|
||
|
if (locked > 0) {
|
||
|
for (i = 0; i < num_pages; i++) {
|
||
|
u64 pa = vmballoon_batch_get_pa(b->batch_page, i);
|
||
|
struct page *p = pfn_to_page(pa >> PAGE_SHIFT);
|
||
|
|
||
|
vmballoon_free_page(p, is_2m_pages);
|
||
|
}
|
||
|
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
for (i = 0; i < num_pages; i++) {
|
||
|
u64 pa = vmballoon_batch_get_pa(b->batch_page, i);
|
||
|
struct page *p = pfn_to_page(pa >> PAGE_SHIFT);
|
||
|
struct vmballoon_page_size *page_size =
|
||
|
&b->page_sizes[is_2m_pages];
|
||
|
|
||
|
locked = vmballoon_batch_get_status(b->batch_page, i);
|
||
|
|
||
|
switch (locked) {
|
||
|
case VMW_BALLOON_SUCCESS:
|
||
|
list_add(&p->lru, &page_size->pages);
|
||
|
b->size += size_per_page;
|
||
|
break;
|
||
|
case VMW_BALLOON_ERROR_PPN_PINNED:
|
||
|
case VMW_BALLOON_ERROR_PPN_INVALID:
|
||
|
if (page_size->n_refused_pages
|
||
|
< VMW_BALLOON_MAX_REFUSED) {
|
||
|
list_add(&p->lru, &page_size->refused_pages);
|
||
|
page_size->n_refused_pages++;
|
||
|
break;
|
||
|
}
|
||
|
/* Fallthrough */
|
||
|
case VMW_BALLOON_ERROR_RESET:
|
||
|
case VMW_BALLOON_ERROR_PPN_NOTNEEDED:
|
||
|
vmballoon_free_page(p, is_2m_pages);
|
||
|
break;
|
||
|
default:
|
||
|
/* This should never happen */
|
||
|
WARN_ON_ONCE(true);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Release the page allocated for the balloon. Note that we first notify
|
||
|
* the host so it can make sure the page will be available for the guest
|
||
|
* to use, if needed.
|
||
|
*/
|
||
|
static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages,
|
||
|
bool is_2m_pages, unsigned int *target)
|
||
|
{
|
||
|
struct page *page = b->page;
|
||
|
struct vmballoon_page_size *page_size = &b->page_sizes[false];
|
||
|
|
||
|
/* is_2m_pages can never happen as 2m pages support implies batching */
|
||
|
|
||
|
if (!vmballoon_send_unlock_page(b, page_to_pfn(page), target)) {
|
||
|
list_add(&page->lru, &page_size->pages);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
/* deallocate page */
|
||
|
vmballoon_free_page(page, false);
|
||
|
STATS_INC(b->stats.free[false]);
|
||
|
|
||
|
/* update balloon size */
|
||
|
b->size--;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int vmballoon_unlock_batched_page(struct vmballoon *b,
|
||
|
unsigned int num_pages, bool is_2m_pages,
|
||
|
unsigned int *target)
|
||
|
{
|
||
|
int locked, i, ret = 0;
|
||
|
bool hv_success;
|
||
|
u16 size_per_page = vmballoon_page_size(is_2m_pages);
|
||
|
|
||
|
hv_success = vmballoon_send_batched_unlock(b, num_pages, is_2m_pages,
|
||
|
target);
|
||
|
if (!hv_success)
|
||
|
ret = -EIO;
|
||
|
|
||
|
for (i = 0; i < num_pages; i++) {
|
||
|
u64 pa = vmballoon_batch_get_pa(b->batch_page, i);
|
||
|
struct page *p = pfn_to_page(pa >> PAGE_SHIFT);
|
||
|
struct vmballoon_page_size *page_size =
|
||
|
&b->page_sizes[is_2m_pages];
|
||
|
|
||
|
locked = vmballoon_batch_get_status(b->batch_page, i);
|
||
|
if (!hv_success || locked != VMW_BALLOON_SUCCESS) {
|
||
|
/*
|
||
|
* That page wasn't successfully unlocked by the
|
||
|
* hypervisor, re-add it to the list of pages owned by
|
||
|
* the balloon driver.
|
||
|
*/
|
||
|
list_add(&p->lru, &page_size->pages);
|
||
|
} else {
|
||
|
/* deallocate page */
|
||
|
vmballoon_free_page(p, is_2m_pages);
|
||
|
STATS_INC(b->stats.free[is_2m_pages]);
|
||
|
|
||
|
/* update balloon size */
|
||
|
b->size -= size_per_page;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Release pages that were allocated while attempting to inflate the
|
||
|
* balloon but were refused by the host for one reason or another.
|
||
|
*/
|
||
|
static void vmballoon_release_refused_pages(struct vmballoon *b,
|
||
|
bool is_2m_pages)
|
||
|
{
|
||
|
struct page *page, *next;
|
||
|
struct vmballoon_page_size *page_size =
|
||
|
&b->page_sizes[is_2m_pages];
|
||
|
|
||
|
list_for_each_entry_safe(page, next, &page_size->refused_pages, lru) {
|
||
|
list_del(&page->lru);
|
||
|
vmballoon_free_page(page, is_2m_pages);
|
||
|
STATS_INC(b->stats.refused_free[is_2m_pages]);
|
||
|
}
|
||
|
|
||
|
page_size->n_refused_pages = 0;
|
||
|
}
|
||
|
|
||
|
static void vmballoon_add_page(struct vmballoon *b, int idx, struct page *p)
|
||
|
{
|
||
|
b->page = p;
|
||
|
}
|
||
|
|
||
|
static void vmballoon_add_batched_page(struct vmballoon *b, int idx,
|
||
|
struct page *p)
|
||
|
{
|
||
|
vmballoon_batch_set_pa(b->batch_page, idx,
|
||
|
(u64)page_to_pfn(p) << PAGE_SHIFT);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Inflate the balloon towards its target size. Note that we try to limit
|
||
|
* the rate of allocation to make sure we are not choking the rest of the
|
||
|
* system.
|
||
|
*/
|
||
|
static void vmballoon_inflate(struct vmballoon *b)
|
||
|
{
|
||
|
unsigned rate;
|
||
|
unsigned int allocations = 0;
|
||
|
unsigned int num_pages = 0;
|
||
|
int error = 0;
|
||
|
gfp_t flags = VMW_PAGE_ALLOC_NOSLEEP;
|
||
|
bool is_2m_pages;
|
||
|
|
||
|
pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target);
|
||
|
|
||
|
/*
|
||
|
* First try NOSLEEP page allocations to inflate balloon.
|
||
|
*
|
||
|
* If we do not throttle nosleep allocations, we can drain all
|
||
|
* free pages in the guest quickly (if the balloon target is high).
|
||
|
* As a side-effect, draining free pages helps to inform (force)
|
||
|
* the guest to start swapping if balloon target is not met yet,
|
||
|
* which is a desired behavior. However, balloon driver can consume
|
||
|
* all available CPU cycles if too many pages are allocated in a
|
||
|
* second. Therefore, we throttle nosleep allocations even when
|
||
|
* the guest is not under memory pressure. OTOH, if we have already
|
||
|
* predicted that the guest is under memory pressure, then we
|
||
|
* slowdown page allocations considerably.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* Start with no sleep allocation rate which may be higher
|
||
|
* than sleeping allocation rate.
|
||
|
*/
|
||
|
if (b->slow_allocation_cycles) {
|
||
|
rate = b->rate_alloc;
|
||
|
is_2m_pages = false;
|
||
|
} else {
|
||
|
rate = UINT_MAX;
|
||
|
is_2m_pages =
|
||
|
b->supported_page_sizes == VMW_BALLOON_NUM_PAGE_SIZES;
|
||
|
}
|
||
|
|
||
|
pr_debug("%s - goal: %d, no-sleep rate: %u, sleep rate: %d\n",
|
||
|
__func__, b->target - b->size, rate, b->rate_alloc);
|
||
|
|
||
|
while (!b->reset_required &&
|
||
|
b->size + num_pages * vmballoon_page_size(is_2m_pages)
|
||
|
< b->target) {
|
||
|
struct page *page;
|
||
|
|
||
|
if (flags == VMW_PAGE_ALLOC_NOSLEEP)
|
||
|
STATS_INC(b->stats.alloc[is_2m_pages]);
|
||
|
else
|
||
|
STATS_INC(b->stats.sleep_alloc);
|
||
|
|
||
|
page = vmballoon_alloc_page(flags, is_2m_pages);
|
||
|
if (!page) {
|
||
|
STATS_INC(b->stats.alloc_fail[is_2m_pages]);
|
||
|
|
||
|
if (is_2m_pages) {
|
||
|
b->ops->lock(b, num_pages, true, &b->target);
|
||
|
|
||
|
/*
|
||
|
* ignore errors from locking as we now switch
|
||
|
* to 4k pages and we might get different
|
||
|
* errors.
|
||
|
*/
|
||
|
|
||
|
num_pages = 0;
|
||
|
is_2m_pages = false;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
if (flags == VMW_PAGE_ALLOC_CANSLEEP) {
|
||
|
/*
|
||
|
* CANSLEEP page allocation failed, so guest
|
||
|
* is under severe memory pressure. Quickly
|
||
|
* decrease allocation rate.
|
||
|
*/
|
||
|
b->rate_alloc = max(b->rate_alloc / 2,
|
||
|
VMW_BALLOON_RATE_ALLOC_MIN);
|
||
|
STATS_INC(b->stats.sleep_alloc_fail);
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* NOSLEEP page allocation failed, so the guest is
|
||
|
* under memory pressure. Let us slow down page
|
||
|
* allocations for next few cycles so that the guest
|
||
|
* gets out of memory pressure. Also, if we already
|
||
|
* allocated b->rate_alloc pages, let's pause,
|
||
|
* otherwise switch to sleeping allocations.
|
||
|
*/
|
||
|
b->slow_allocation_cycles = VMW_BALLOON_SLOW_CYCLES;
|
||
|
|
||
|
if (allocations >= b->rate_alloc)
|
||
|
break;
|
||
|
|
||
|
flags = VMW_PAGE_ALLOC_CANSLEEP;
|
||
|
/* Lower rate for sleeping allocations. */
|
||
|
rate = b->rate_alloc;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
b->ops->add_page(b, num_pages++, page);
|
||
|
if (num_pages == b->batch_max_pages) {
|
||
|
error = b->ops->lock(b, num_pages, is_2m_pages,
|
||
|
&b->target);
|
||
|
num_pages = 0;
|
||
|
if (error)
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
cond_resched();
|
||
|
|
||
|
if (allocations >= rate) {
|
||
|
/* We allocated enough pages, let's take a break. */
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (num_pages > 0)
|
||
|
b->ops->lock(b, num_pages, is_2m_pages, &b->target);
|
||
|
|
||
|
/*
|
||
|
* We reached our goal without failures so try increasing
|
||
|
* allocation rate.
|
||
|
*/
|
||
|
if (error == 0 && allocations >= b->rate_alloc) {
|
||
|
unsigned int mult = allocations / b->rate_alloc;
|
||
|
|
||
|
b->rate_alloc =
|
||
|
min(b->rate_alloc + mult * VMW_BALLOON_RATE_ALLOC_INC,
|
||
|
VMW_BALLOON_RATE_ALLOC_MAX);
|
||
|
}
|
||
|
|
||
|
vmballoon_release_refused_pages(b, true);
|
||
|
vmballoon_release_refused_pages(b, false);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Decrease the size of the balloon allowing guest to use more memory.
|
||
|
*/
|
||
|
static void vmballoon_deflate(struct vmballoon *b)
|
||
|
{
|
||
|
unsigned is_2m_pages;
|
||
|
|
||
|
pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target);
|
||
|
|
||
|
/* free pages to reach target */
|
||
|
for (is_2m_pages = 0; is_2m_pages < b->supported_page_sizes;
|
||
|
is_2m_pages++) {
|
||
|
struct page *page, *next;
|
||
|
unsigned int num_pages = 0;
|
||
|
struct vmballoon_page_size *page_size =
|
||
|
&b->page_sizes[is_2m_pages];
|
||
|
|
||
|
list_for_each_entry_safe(page, next, &page_size->pages, lru) {
|
||
|
if (b->reset_required ||
|
||
|
(b->target > 0 &&
|
||
|
b->size - num_pages
|
||
|
* vmballoon_page_size(is_2m_pages)
|
||
|
< b->target + vmballoon_page_size(true)))
|
||
|
break;
|
||
|
|
||
|
list_del(&page->lru);
|
||
|
b->ops->add_page(b, num_pages++, page);
|
||
|
|
||
|
if (num_pages == b->batch_max_pages) {
|
||
|
int error;
|
||
|
|
||
|
error = b->ops->unlock(b, num_pages,
|
||
|
is_2m_pages, &b->target);
|
||
|
num_pages = 0;
|
||
|
if (error)
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
cond_resched();
|
||
|
}
|
||
|
|
||
|
if (num_pages > 0)
|
||
|
b->ops->unlock(b, num_pages, is_2m_pages, &b->target);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static const struct vmballoon_ops vmballoon_basic_ops = {
|
||
|
.add_page = vmballoon_add_page,
|
||
|
.lock = vmballoon_lock_page,
|
||
|
.unlock = vmballoon_unlock_page
|
||
|
};
|
||
|
|
||
|
static const struct vmballoon_ops vmballoon_batched_ops = {
|
||
|
.add_page = vmballoon_add_batched_page,
|
||
|
.lock = vmballoon_lock_batched_page,
|
||
|
.unlock = vmballoon_unlock_batched_page
|
||
|
};
|
||
|
|
||
|
static bool vmballoon_init_batching(struct vmballoon *b)
|
||
|
{
|
||
|
struct page *page;
|
||
|
|
||
|
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
|
||
|
if (!page)
|
||
|
return false;
|
||
|
|
||
|
b->batch_page = page_address(page);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Receive notification and resize balloon
|
||
|
*/
|
||
|
static void vmballoon_doorbell(void *client_data)
|
||
|
{
|
||
|
struct vmballoon *b = client_data;
|
||
|
|
||
|
STATS_INC(b->stats.doorbell);
|
||
|
|
||
|
mod_delayed_work(system_freezable_wq, &b->dwork, 0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Clean up vmci doorbell
|
||
|
*/
|
||
|
static void vmballoon_vmci_cleanup(struct vmballoon *b)
|
||
|
{
|
||
|
int error;
|
||
|
|
||
|
VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, VMCI_INVALID_ID,
|
||
|
VMCI_INVALID_ID, error);
|
||
|
STATS_INC(b->stats.doorbell_unset);
|
||
|
|
||
|
if (!vmci_handle_is_invalid(b->vmci_doorbell)) {
|
||
|
vmci_doorbell_destroy(b->vmci_doorbell);
|
||
|
b->vmci_doorbell = VMCI_INVALID_HANDLE;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Initialize vmci doorbell, to get notified as soon as balloon changes
|
||
|
*/
|
||
|
static int vmballoon_vmci_init(struct vmballoon *b)
|
||
|
{
|
||
|
unsigned long error, dummy;
|
||
|
|
||
|
if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) == 0)
|
||
|
return 0;
|
||
|
|
||
|
error = vmci_doorbell_create(&b->vmci_doorbell, VMCI_FLAG_DELAYED_CB,
|
||
|
VMCI_PRIVILEGE_FLAG_RESTRICTED,
|
||
|
vmballoon_doorbell, b);
|
||
|
|
||
|
if (error != VMCI_SUCCESS)
|
||
|
goto fail;
|
||
|
|
||
|
error = VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, b->vmci_doorbell.context,
|
||
|
b->vmci_doorbell.resource, dummy);
|
||
|
|
||
|
STATS_INC(b->stats.doorbell_set);
|
||
|
|
||
|
if (error != VMW_BALLOON_SUCCESS)
|
||
|
goto fail;
|
||
|
|
||
|
return 0;
|
||
|
fail:
|
||
|
vmballoon_vmci_cleanup(b);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Perform standard reset sequence by popping the balloon (in case it
|
||
|
* is not empty) and then restarting protocol. This operation normally
|
||
|
* happens when host responds with VMW_BALLOON_ERROR_RESET to a command.
|
||
|
*/
|
||
|
static void vmballoon_reset(struct vmballoon *b)
|
||
|
{
|
||
|
int error;
|
||
|
|
||
|
vmballoon_vmci_cleanup(b);
|
||
|
|
||
|
/* free all pages, skipping monitor unlock */
|
||
|
vmballoon_pop(b);
|
||
|
|
||
|
if (!vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES))
|
||
|
return;
|
||
|
|
||
|
if ((b->capabilities & VMW_BALLOON_BATCHED_CMDS) != 0) {
|
||
|
b->ops = &vmballoon_batched_ops;
|
||
|
b->batch_max_pages = VMW_BALLOON_BATCH_MAX_PAGES;
|
||
|
if (!vmballoon_init_batching(b)) {
|
||
|
/*
|
||
|
* We failed to initialize batching, inform the monitor
|
||
|
* about it by sending a null capability.
|
||
|
*
|
||
|
* The guest will retry in one second.
|
||
|
*/
|
||
|
vmballoon_send_start(b, 0);
|
||
|
return;
|
||
|
}
|
||
|
} else if ((b->capabilities & VMW_BALLOON_BASIC_CMDS) != 0) {
|
||
|
b->ops = &vmballoon_basic_ops;
|
||
|
b->batch_max_pages = 1;
|
||
|
}
|
||
|
|
||
|
b->reset_required = false;
|
||
|
|
||
|
error = vmballoon_vmci_init(b);
|
||
|
if (error)
|
||
|
pr_err("failed to initialize vmci doorbell\n");
|
||
|
|
||
|
if (!vmballoon_send_guest_id(b))
|
||
|
pr_err("failed to send guest ID to the host\n");
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Balloon work function: reset protocol, if needed, get the new size and
|
||
|
* adjust balloon as needed. Repeat in 1 sec.
|
||
|
*/
|
||
|
static void vmballoon_work(struct work_struct *work)
|
||
|
{
|
||
|
struct delayed_work *dwork = to_delayed_work(work);
|
||
|
struct vmballoon *b = container_of(dwork, struct vmballoon, dwork);
|
||
|
unsigned int target;
|
||
|
|
||
|
STATS_INC(b->stats.timer);
|
||
|
|
||
|
if (b->reset_required)
|
||
|
vmballoon_reset(b);
|
||
|
|
||
|
if (b->slow_allocation_cycles > 0)
|
||
|
b->slow_allocation_cycles--;
|
||
|
|
||
|
if (!b->reset_required && vmballoon_send_get_target(b, &target)) {
|
||
|
/* update target, adjust size */
|
||
|
b->target = target;
|
||
|
|
||
|
if (b->size < target)
|
||
|
vmballoon_inflate(b);
|
||
|
else if (target == 0 ||
|
||
|
b->size > target + vmballoon_page_size(true))
|
||
|
vmballoon_deflate(b);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We are using a freezable workqueue so that balloon operations are
|
||
|
* stopped while the system transitions to/from sleep/hibernation.
|
||
|
*/
|
||
|
queue_delayed_work(system_freezable_wq,
|
||
|
dwork, round_jiffies_relative(HZ));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* DEBUGFS Interface
|
||
|
*/
|
||
|
#ifdef CONFIG_DEBUG_FS
|
||
|
|
||
|
static int vmballoon_debug_show(struct seq_file *f, void *offset)
|
||
|
{
|
||
|
struct vmballoon *b = f->private;
|
||
|
struct vmballoon_stats *stats = &b->stats;
|
||
|
|
||
|
/* format capabilities info */
|
||
|
seq_printf(f,
|
||
|
"balloon capabilities: %#4x\n"
|
||
|
"used capabilities: %#4lx\n"
|
||
|
"is resetting: %c\n",
|
||
|
VMW_BALLOON_CAPABILITIES, b->capabilities,
|
||
|
b->reset_required ? 'y' : 'n');
|
||
|
|
||
|
/* format size info */
|
||
|
seq_printf(f,
|
||
|
"target: %8d pages\n"
|
||
|
"current: %8d pages\n",
|
||
|
b->target, b->size);
|
||
|
|
||
|
/* format rate info */
|
||
|
seq_printf(f,
|
||
|
"rateSleepAlloc: %8d pages/sec\n",
|
||
|
b->rate_alloc);
|
||
|
|
||
|
seq_printf(f,
|
||
|
"\n"
|
||
|
"timer: %8u\n"
|
||
|
"doorbell: %8u\n"
|
||
|
"start: %8u (%4u failed)\n"
|
||
|
"guestType: %8u (%4u failed)\n"
|
||
|
"2m-lock: %8u (%4u failed)\n"
|
||
|
"lock: %8u (%4u failed)\n"
|
||
|
"2m-unlock: %8u (%4u failed)\n"
|
||
|
"unlock: %8u (%4u failed)\n"
|
||
|
"target: %8u (%4u failed)\n"
|
||
|
"prim2mAlloc: %8u (%4u failed)\n"
|
||
|
"primNoSleepAlloc: %8u (%4u failed)\n"
|
||
|
"primCanSleepAlloc: %8u (%4u failed)\n"
|
||
|
"prim2mFree: %8u\n"
|
||
|
"primFree: %8u\n"
|
||
|
"err2mAlloc: %8u\n"
|
||
|
"errAlloc: %8u\n"
|
||
|
"err2mFree: %8u\n"
|
||
|
"errFree: %8u\n"
|
||
|
"doorbellSet: %8u\n"
|
||
|
"doorbellUnset: %8u\n",
|
||
|
stats->timer,
|
||
|
stats->doorbell,
|
||
|
stats->start, stats->start_fail,
|
||
|
stats->guest_type, stats->guest_type_fail,
|
||
|
stats->lock[true], stats->lock_fail[true],
|
||
|
stats->lock[false], stats->lock_fail[false],
|
||
|
stats->unlock[true], stats->unlock_fail[true],
|
||
|
stats->unlock[false], stats->unlock_fail[false],
|
||
|
stats->target, stats->target_fail,
|
||
|
stats->alloc[true], stats->alloc_fail[true],
|
||
|
stats->alloc[false], stats->alloc_fail[false],
|
||
|
stats->sleep_alloc, stats->sleep_alloc_fail,
|
||
|
stats->free[true],
|
||
|
stats->free[false],
|
||
|
stats->refused_alloc[true], stats->refused_alloc[false],
|
||
|
stats->refused_free[true], stats->refused_free[false],
|
||
|
stats->doorbell_set, stats->doorbell_unset);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int vmballoon_debug_open(struct inode *inode, struct file *file)
|
||
|
{
|
||
|
return single_open(file, vmballoon_debug_show, inode->i_private);
|
||
|
}
|
||
|
|
||
|
static const struct file_operations vmballoon_debug_fops = {
|
||
|
.owner = THIS_MODULE,
|
||
|
.open = vmballoon_debug_open,
|
||
|
.read = seq_read,
|
||
|
.llseek = seq_lseek,
|
||
|
.release = single_release,
|
||
|
};
|
||
|
|
||
|
static int __init vmballoon_debugfs_init(struct vmballoon *b)
|
||
|
{
|
||
|
int error;
|
||
|
|
||
|
b->dbg_entry = debugfs_create_file("vmmemctl", S_IRUGO, NULL, b,
|
||
|
&vmballoon_debug_fops);
|
||
|
if (IS_ERR(b->dbg_entry)) {
|
||
|
error = PTR_ERR(b->dbg_entry);
|
||
|
pr_err("failed to create debugfs entry, error: %d\n", error);
|
||
|
return error;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void __exit vmballoon_debugfs_exit(struct vmballoon *b)
|
||
|
{
|
||
|
debugfs_remove(b->dbg_entry);
|
||
|
}
|
||
|
|
||
|
#else
|
||
|
|
||
|
static inline int vmballoon_debugfs_init(struct vmballoon *b)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static inline void vmballoon_debugfs_exit(struct vmballoon *b)
|
||
|
{
|
||
|
}
|
||
|
|
||
|
#endif /* CONFIG_DEBUG_FS */
|
||
|
|
||
|
static int __init vmballoon_init(void)
|
||
|
{
|
||
|
int error;
|
||
|
unsigned is_2m_pages;
|
||
|
/*
|
||
|
* Check if we are running on VMware's hypervisor and bail out
|
||
|
* if we are not.
|
||
|
*/
|
||
|
if (x86_hyper != &x86_hyper_vmware)
|
||
|
return -ENODEV;
|
||
|
|
||
|
for (is_2m_pages = 0; is_2m_pages < VMW_BALLOON_NUM_PAGE_SIZES;
|
||
|
is_2m_pages++) {
|
||
|
INIT_LIST_HEAD(&balloon.page_sizes[is_2m_pages].pages);
|
||
|
INIT_LIST_HEAD(&balloon.page_sizes[is_2m_pages].refused_pages);
|
||
|
}
|
||
|
|
||
|
/* initialize rates */
|
||
|
balloon.rate_alloc = VMW_BALLOON_RATE_ALLOC_MAX;
|
||
|
|
||
|
INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work);
|
||
|
|
||
|
error = vmballoon_debugfs_init(&balloon);
|
||
|
if (error)
|
||
|
return error;
|
||
|
|
||
|
balloon.vmci_doorbell = VMCI_INVALID_HANDLE;
|
||
|
balloon.batch_page = NULL;
|
||
|
balloon.page = NULL;
|
||
|
balloon.reset_required = true;
|
||
|
|
||
|
queue_delayed_work(system_freezable_wq, &balloon.dwork, 0);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Using late_initcall() instead of module_init() allows the balloon to use the
|
||
|
* VMCI doorbell even when the balloon is built into the kernel. Otherwise the
|
||
|
* VMCI is probed only after the balloon is initialized. If the balloon is used
|
||
|
* as a module, late_initcall() is equivalent to module_init().
|
||
|
*/
|
||
|
late_initcall(vmballoon_init);
|
||
|
|
||
|
static void __exit vmballoon_exit(void)
|
||
|
{
|
||
|
vmballoon_vmci_cleanup(&balloon);
|
||
|
cancel_delayed_work_sync(&balloon.dwork);
|
||
|
|
||
|
vmballoon_debugfs_exit(&balloon);
|
||
|
|
||
|
/*
|
||
|
* Deallocate all reserved memory, and reset connection with monitor.
|
||
|
* Reset connection before deallocating memory to avoid potential for
|
||
|
* additional spurious resets from guest touching deallocated pages.
|
||
|
*/
|
||
|
vmballoon_send_start(&balloon, 0);
|
||
|
vmballoon_pop(&balloon);
|
||
|
}
|
||
|
module_exit(vmballoon_exit);
|