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VMware balloon: Enable notification via VMCI

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Get notified immediately when a balloon target is set, instead of waiting for
up to one second.

The up-to 1 second gap could be long enough to cause swapping inside of the
VM that receives the VM.

Acked-by: Andy King <acking@vmware.com>
Signed-off-by: Xavier Deguillard <xdeguillard@vmware.com>
Tested-by: Siva Sankar Reddy B <sankars@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Philip P. Moltmann 2015-08-06 15:18:01 -07:00 committed by Greg Kroah-Hartman
parent d7568c130d
commit 48e3d668b7
2 changed files with 97 additions and 10 deletions
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2
drivers/misc/Kconfig
View File

@ -414,7 +414,7 @@ config TI_DAC7512
config VMWARE_BALLOON
tristate "VMware Balloon Driver"
depends on X86 && HYPERVISOR_GUEST
depends on VMWARE_VMCI && X86 && HYPERVISOR_GUEST
help
This is VMware physical memory management driver which acts
like a "balloon" that can be inflated to reclaim physical pages

105
drivers/misc/vmw_balloon.c
View File

@ -1,7 +1,7 @@
/*
* VMware Balloon driver.
*
* Copyright (C) 2000-2013, VMware, Inc. All Rights Reserved.
* Copyright (C) 2000-2014, VMware, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@ -43,11 +43,13 @@
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/vmw_vmci_defs.h>
#include <linux/vmw_vmci_api.h>
#include <asm/hypervisor.h>
MODULE_AUTHOR("VMware, Inc.");
MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
MODULE_VERSION("1.4.1.0-k");
MODULE_VERSION("1.5.0.0-k");
MODULE_ALIAS("dmi:*:svnVMware*:*");
MODULE_ALIAS("vmware_vmmemctl");
MODULE_LICENSE("GPL");
@ -101,14 +103,16 @@ enum vmwballoon_capabilities {
/*
* Bit 0 is reserved and not associated to any capability.
*/
VMW_BALLOON_BASIC_CMDS = (1 << 1),
VMW_BALLOON_BATCHED_CMDS = (1 << 2),
VMW_BALLOON_BATCHED_2M_CMDS = (1 << 3),
VMW_BALLOON_BASIC_CMDS = (1 << 1),
VMW_BALLOON_BATCHED_CMDS = (1 << 2),
VMW_BALLOON_BATCHED_2M_CMDS = (1 << 3),
VMW_BALLOON_SIGNALLED_WAKEUP_CMD = (1 << 4),
};
#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_BASIC_CMDS \
| VMW_BALLOON_BATCHED_CMDS \
| VMW_BALLOON_BATCHED_2M_CMDS)
| VMW_BALLOON_BATCHED_2M_CMDS \
| VMW_BALLOON_SIGNALLED_WAKEUP_CMD)
#define VMW_BALLOON_2M_SHIFT (9)
#define VMW_BALLOON_NUM_PAGE_SIZES (2)
@ -123,7 +127,9 @@ enum vmwballoon_capabilities {
* VMW_BALLOON_BATCHED_CMDS:
* BATCHED_LOCK and BATCHED_UNLOCK commands.
* VMW BALLOON_BATCHED_2M_CMDS:
* BATCHED_2M_LOCK and BATCHED_2M_UNLOCK commands.
* BATCHED_2M_LOCK and BATCHED_2M_UNLOCK commands,
* VMW VMW_BALLOON_SIGNALLED_WAKEUP_CMD:
* VMW_BALLOON_CMD_VMCI_DOORBELL_SET command.
*/
#define VMW_BALLOON_CMD_START 0
#define VMW_BALLOON_CMD_GET_TARGET 1
@ -134,6 +140,7 @@ enum vmwballoon_capabilities {
#define VMW_BALLOON_CMD_BATCHED_UNLOCK 7
#define VMW_BALLOON_CMD_BATCHED_2M_LOCK 8
#define VMW_BALLOON_CMD_BATCHED_2M_UNLOCK 9
#define VMW_BALLOON_CMD_VMCI_DOORBELL_SET 10
/* error codes */
@ -214,6 +221,7 @@ static void vmballoon_batch_set_pa(struct vmballoon_batch_page *batch, int idx,
#ifdef CONFIG_DEBUG_FS
struct vmballoon_stats {
unsigned int timer;
unsigned int doorbell;
/* allocation statistics */
unsigned int alloc[VMW_BALLOON_NUM_PAGE_SIZES];
@ -235,6 +243,8 @@ struct vmballoon_stats {
unsigned int start_fail;
unsigned int guest_type;
unsigned int guest_type_fail;
unsigned int doorbell_set;
unsigned int doorbell_unset;
};
#define STATS_INC(stat) (stat)++
@ -299,6 +309,8 @@ struct vmballoon {
struct sysinfo sysinfo;
struct delayed_work dwork;
struct vmci_handle vmci_doorbell;
};
static struct vmballoon balloon;
@ -992,6 +1004,65 @@ static bool vmballoon_init_batching(struct vmballoon *b)
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)
{
int error = 0;
if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) != 0) {
error = vmci_doorbell_create(&b->vmci_doorbell,
VMCI_FLAG_DELAYED_CB,
VMCI_PRIVILEGE_FLAG_RESTRICTED,
vmballoon_doorbell, b);
if (error == VMCI_SUCCESS) {
VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET,
b->vmci_doorbell.context,
b->vmci_doorbell.resource, error);
STATS_INC(b->stats.doorbell_set);
}
}
if (error != 0) {
vmballoon_vmci_cleanup(b);
return -EIO;
}
return 0;
}
/*
* Perform standard reset sequence by popping the balloon (in case it
* is not empty) and then restarting protocol. This operation normally
@ -999,6 +1070,10 @@ static bool vmballoon_init_batching(struct vmballoon *b)
*/
static void vmballoon_reset(struct vmballoon *b)
{
int error;
vmballoon_vmci_cleanup(b);
/* free all pages, skipping monitor unlock */
vmballoon_pop(b);
@ -1024,6 +1099,11 @@ static void vmballoon_reset(struct vmballoon *b)
}
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");
}
@ -1097,6 +1177,7 @@ static int vmballoon_debug_show(struct seq_file *f, void *offset)
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"
@ -1112,8 +1193,11 @@ static int vmballoon_debug_show(struct seq_file *f, void *offset)
"err2mAlloc: %8u\n"
"errAlloc: %8u\n"
"err2mFree: %8u\n"
"errFree: %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],
@ -1127,7 +1211,8 @@ static int vmballoon_debug_show(struct seq_file *f, void *offset)
stats->free[true],
stats->free[false],
stats->refused_alloc[true], stats->refused_alloc[false],
stats->refused_free[true], stats->refused_free[false]);
stats->refused_free[true], stats->refused_free[false],
stats->doorbell_set, stats->doorbell_unset);
return 0;
}
@ -1204,6 +1289,7 @@ static int __init vmballoon_init(void)
if (error)
return error;
balloon.vmci_doorbell = VMCI_INVALID_HANDLE;
balloon.batch_page = NULL;
balloon.page = NULL;
balloon.reset_required = true;
@ -1216,6 +1302,7 @@ module_init(vmballoon_init);
static void __exit vmballoon_exit(void)
{
vmballoon_vmci_cleanup(&balloon);
cancel_delayed_work_sync(&balloon.dwork);
vmballoon_debugfs_exit(&balloon);