diff options
Diffstat (limited to 'kernel/drivers/misc/vmw_balloon.c')
| -rw-r--r-- | kernel/drivers/misc/vmw_balloon.c | 957 |
1 files changed, 718 insertions, 239 deletions
diff --git a/kernel/drivers/misc/vmw_balloon.c b/kernel/drivers/misc/vmw_balloon.c index 191617492..1e688bfec 100644 --- a/kernel/drivers/misc/vmw_balloon.c +++ b/kernel/drivers/misc/vmw_balloon.c @@ -1,7 +1,7 @@ /* * VMware Balloon driver. * - * Copyright (C) 2000-2010, 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 @@ -37,16 +37,19 @@ #include <linux/types.h> #include <linux/kernel.h> #include <linux/mm.h> +#include <linux/vmalloc.h> #include <linux/sched.h> #include <linux/module.h> #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("1.2.1.3-k"); +MODULE_VERSION("1.5.0.0-k"); MODULE_ALIAS("dmi:*:svnVMware*:*"); MODULE_ALIAS("vmware_vmmemctl"); MODULE_LICENSE("GPL"); @@ -57,12 +60,6 @@ MODULE_LICENSE("GPL"); */ /* - * Rate of allocating memory when there is no memory pressure - * (driver performs non-sleeping allocations). - */ -#define VMW_BALLOON_NOSLEEP_ALLOC_MAX 16384U - -/* * Rates of memory allocaton when guest experiences memory pressure * (driver performs sleeping allocations). */ @@ -71,13 +68,6 @@ MODULE_LICENSE("GPL"); #define VMW_BALLOON_RATE_ALLOC_INC 16U /* - * Rates for releasing pages while deflating balloon. - */ -#define VMW_BALLOON_RATE_FREE_MIN 512U -#define VMW_BALLOON_RATE_FREE_MAX 16384U -#define VMW_BALLOON_RATE_FREE_INC 16U - -/* * When guest is under memory pressure, use a reduced page allocation * rate for next several cycles. */ @@ -85,7 +75,7 @@ MODULE_LICENSE("GPL"); /* * Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't - * allow wait (__GFP_WAIT) for NOSLEEP page allocations. Use + * allow wait (__GFP_RECLAIM) for NOSLEEP page allocations. Use * __GFP_NOWARN, to suppress page allocation failure warnings. */ #define VMW_PAGE_ALLOC_NOSLEEP (__GFP_HIGHMEM|__GFP_NOWARN) @@ -99,9 +89,6 @@ MODULE_LICENSE("GPL"); */ #define VMW_PAGE_ALLOC_CANSLEEP (GFP_HIGHUSER) -/* Maximum number of page allocations without yielding processor */ -#define VMW_BALLOON_YIELD_THRESHOLD 1024 - /* Maximum number of refused pages we accumulate during inflation cycle */ #define VMW_BALLOON_MAX_REFUSED 16 @@ -110,68 +97,154 @@ MODULE_LICENSE("GPL"); */ #define VMW_BALLOON_HV_PORT 0x5670 #define VMW_BALLOON_HV_MAGIC 0x456c6d6f -#define VMW_BALLOON_PROTOCOL_VERSION 2 #define VMW_BALLOON_GUEST_ID 1 /* Linux */ -#define VMW_BALLOON_CMD_START 0 -#define VMW_BALLOON_CMD_GET_TARGET 1 -#define VMW_BALLOON_CMD_LOCK 2 -#define VMW_BALLOON_CMD_UNLOCK 3 -#define VMW_BALLOON_CMD_GUEST_ID 4 +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_SIGNALLED_WAKEUP_CMD = (1 << 4), +}; + +#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_BASIC_CMDS \ + | VMW_BALLOON_BATCHED_CMDS \ + | VMW_BALLOON_BATCHED_2M_CMDS \ + | VMW_BALLOON_SIGNALLED_WAKEUP_CMD) + +#define VMW_BALLOON_2M_SHIFT (9) +#define VMW_BALLOON_NUM_PAGE_SIZES (2) + +/* + * Backdoor commands availability: + * + * START, GET_TARGET and GUEST_ID are always available, + * + * VMW_BALLOON_BASIC_CMDS: + * LOCK and UNLOCK commands, + * VMW_BALLOON_BATCHED_CMDS: + * BATCHED_LOCK and BATCHED_UNLOCK commands. + * VMW BALLOON_BATCHED_2M_CMDS: + * 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 +#define VMW_BALLOON_CMD_LOCK 2 +#define VMW_BALLOON_CMD_UNLOCK 3 +#define VMW_BALLOON_CMD_GUEST_ID 4 +#define VMW_BALLOON_CMD_BATCHED_LOCK 6 +#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 */ -#define VMW_BALLOON_SUCCESS 0 -#define VMW_BALLOON_FAILURE -1 -#define VMW_BALLOON_ERROR_CMD_INVALID 1 -#define VMW_BALLOON_ERROR_PPN_INVALID 2 -#define VMW_BALLOON_ERROR_PPN_LOCKED 3 -#define VMW_BALLOON_ERROR_PPN_UNLOCKED 4 -#define VMW_BALLOON_ERROR_PPN_PINNED 5 -#define VMW_BALLOON_ERROR_PPN_NOTNEEDED 6 -#define VMW_BALLOON_ERROR_RESET 7 -#define VMW_BALLOON_ERROR_BUSY 8 - -#define VMWARE_BALLOON_CMD(cmd, data, result) \ -({ \ - unsigned long __stat, __dummy1, __dummy2; \ - __asm__ __volatile__ ("inl %%dx" : \ - "=a"(__stat), \ - "=c"(__dummy1), \ - "=d"(__dummy2), \ - "=b"(result) : \ - "0"(VMW_BALLOON_HV_MAGIC), \ - "1"(VMW_BALLOON_CMD_##cmd), \ - "2"(VMW_BALLOON_HV_PORT), \ - "3"(data) : \ - "memory"); \ - result &= -1UL; \ - __stat & -1UL; \ +#define VMW_BALLOON_SUCCESS 0 +#define VMW_BALLOON_FAILURE -1 +#define VMW_BALLOON_ERROR_CMD_INVALID 1 +#define VMW_BALLOON_ERROR_PPN_INVALID 2 +#define VMW_BALLOON_ERROR_PPN_LOCKED 3 +#define VMW_BALLOON_ERROR_PPN_UNLOCKED 4 +#define VMW_BALLOON_ERROR_PPN_PINNED 5 +#define VMW_BALLOON_ERROR_PPN_NOTNEEDED 6 +#define VMW_BALLOON_ERROR_RESET 7 +#define VMW_BALLOON_ERROR_BUSY 8 + +#define VMW_BALLOON_SUCCESS_WITH_CAPABILITIES (0x03000000) + +/* Batch page description */ + +/* + * Layout of a page in the batch page: + * + * +-------------+----------+--------+ + * | | | | + * | Page number | Reserved | Status | + * | | | | + * +-------------+----------+--------+ + * 64 PAGE_SHIFT 6 0 + * + * The reserved field should be set to 0. + */ +#define VMW_BALLOON_BATCH_MAX_PAGES (PAGE_SIZE / sizeof(u64)) +#define VMW_BALLOON_BATCH_STATUS_MASK ((1UL << 5) - 1) +#define VMW_BALLOON_BATCH_PAGE_MASK (~((1UL << PAGE_SHIFT) - 1)) + +struct vmballoon_batch_page { + u64 pages[VMW_BALLOON_BATCH_MAX_PAGES]; +}; + +static u64 vmballoon_batch_get_pa(struct vmballoon_batch_page *batch, int idx) +{ + return batch->pages[idx] & VMW_BALLOON_BATCH_PAGE_MASK; +} + +static int vmballoon_batch_get_status(struct vmballoon_batch_page *batch, + int idx) +{ + return (int)(batch->pages[idx] & VMW_BALLOON_BATCH_STATUS_MASK); +} + +static void vmballoon_batch_set_pa(struct vmballoon_batch_page *batch, int idx, + u64 pa) +{ + batch->pages[idx] = pa; +} + + +#define VMWARE_BALLOON_CMD(cmd, arg1, arg2, result) \ +({ \ + unsigned long __status, __dummy1, __dummy2, __dummy3; \ + __asm__ __volatile__ ("inl %%dx" : \ + "=a"(__status), \ + "=c"(__dummy1), \ + "=d"(__dummy2), \ + "=b"(result), \ + "=S" (__dummy3) : \ + "0"(VMW_BALLOON_HV_MAGIC), \ + "1"(VMW_BALLOON_CMD_##cmd), \ + "2"(VMW_BALLOON_HV_PORT), \ + "3"(arg1), \ + "4" (arg2) : \ + "memory"); \ + if (VMW_BALLOON_CMD_##cmd == VMW_BALLOON_CMD_START) \ + result = __dummy1; \ + result &= -1UL; \ + __status & -1UL; \ }) #ifdef CONFIG_DEBUG_FS struct vmballoon_stats { unsigned int timer; + unsigned int doorbell; /* allocation statistics */ - unsigned int alloc; - unsigned int alloc_fail; + unsigned int alloc[VMW_BALLOON_NUM_PAGE_SIZES]; + unsigned int alloc_fail[VMW_BALLOON_NUM_PAGE_SIZES]; unsigned int sleep_alloc; unsigned int sleep_alloc_fail; - unsigned int refused_alloc; - unsigned int refused_free; - unsigned int free; + unsigned int refused_alloc[VMW_BALLOON_NUM_PAGE_SIZES]; + unsigned int refused_free[VMW_BALLOON_NUM_PAGE_SIZES]; + unsigned int free[VMW_BALLOON_NUM_PAGE_SIZES]; /* monitor operations */ - unsigned int lock; - unsigned int lock_fail; - unsigned int unlock; - unsigned int unlock_fail; + unsigned int lock[VMW_BALLOON_NUM_PAGE_SIZES]; + unsigned int lock_fail[VMW_BALLOON_NUM_PAGE_SIZES]; + unsigned int unlock[VMW_BALLOON_NUM_PAGE_SIZES]; + unsigned int unlock_fail[VMW_BALLOON_NUM_PAGE_SIZES]; unsigned int target; unsigned int target_fail; unsigned int start; 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)++ @@ -179,14 +252,30 @@ struct vmballoon_stats { #define STATS_INC(stat) #endif -struct vmballoon { +struct vmballoon; +struct vmballoon_ops { + void (*add_page)(struct vmballoon *b, int idx, struct page *p); + int (*lock)(struct vmballoon *b, unsigned int num_pages, + bool is_2m_pages, unsigned int *target); + int (*unlock)(struct vmballoon *b, unsigned int num_pages, + bool is_2m_pages, unsigned int *target); +}; + +struct vmballoon_page_size { /* list of reserved physical pages */ struct list_head pages; /* transient list of non-balloonable pages */ struct list_head refused_pages; unsigned int n_refused_pages; +}; + +struct vmballoon { + struct vmballoon_page_size page_sizes[VMW_BALLOON_NUM_PAGE_SIZES]; + + /* supported page sizes. 1 == 4k pages only, 2 == 4k and 2m pages */ + unsigned supported_page_sizes; /* balloon size in pages */ unsigned int size; @@ -197,11 +286,18 @@ struct vmballoon { /* adjustment rates (pages per second) */ unsigned int rate_alloc; - unsigned int rate_free; /* slowdown page allocations for next few cycles */ unsigned int slow_allocation_cycles; + unsigned long capabilities; + + struct vmballoon_batch_page *batch_page; + unsigned int batch_max_pages; + struct page *page; + + const struct vmballoon_ops *ops; + #ifdef CONFIG_DEBUG_FS /* statistics */ struct vmballoon_stats stats; @@ -213,6 +309,8 @@ struct vmballoon { struct sysinfo sysinfo; struct delayed_work dwork; + + struct vmci_handle vmci_doorbell; }; static struct vmballoon balloon; @@ -221,19 +319,38 @@ static struct vmballoon balloon; * Send "start" command to the host, communicating supported version * of the protocol. */ -static bool vmballoon_send_start(struct vmballoon *b) +static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps) { - unsigned long status, dummy; + unsigned long status, capabilities, dummy = 0; + bool success; STATS_INC(b->stats.start); - status = VMWARE_BALLOON_CMD(START, VMW_BALLOON_PROTOCOL_VERSION, dummy); - if (status == VMW_BALLOON_SUCCESS) - return true; + status = VMWARE_BALLOON_CMD(START, req_caps, dummy, capabilities); - pr_debug("%s - failed, hv returns %ld\n", __func__, status); - STATS_INC(b->stats.start_fail); - return false; + switch (status) { + case VMW_BALLOON_SUCCESS_WITH_CAPABILITIES: + b->capabilities = capabilities; + success = true; + break; + case VMW_BALLOON_SUCCESS: + b->capabilities = VMW_BALLOON_BASIC_CMDS; + success = true; + break; + default: + success = false; + } + + if (b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS) + b->supported_page_sizes = 2; + else + b->supported_page_sizes = 1; + + if (!success) { + pr_debug("%s - failed, hv returns %ld\n", __func__, status); + STATS_INC(b->stats.start_fail); + } + return success; } static bool vmballoon_check_status(struct vmballoon *b, unsigned long status) @@ -259,9 +376,10 @@ static bool vmballoon_check_status(struct vmballoon *b, unsigned long status) */ static bool vmballoon_send_guest_id(struct vmballoon *b) { - unsigned long status, dummy; + unsigned long status, dummy = 0; - status = VMWARE_BALLOON_CMD(GUEST_ID, VMW_BALLOON_GUEST_ID, dummy); + status = VMWARE_BALLOON_CMD(GUEST_ID, VMW_BALLOON_GUEST_ID, dummy, + dummy); STATS_INC(b->stats.guest_type); @@ -273,6 +391,14 @@ static bool vmballoon_send_guest_id(struct vmballoon *b) return false; } +static u16 vmballoon_page_size(bool is_2m_page) +{ + if (is_2m_page) + return 1 << VMW_BALLOON_2M_SHIFT; + + return 1; +} + /* * Retrieve desired balloon size from the host. */ @@ -281,6 +407,7 @@ 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; /* @@ -299,7 +426,7 @@ static bool vmballoon_send_get_target(struct vmballoon *b, u32 *new_target) /* update stats */ STATS_INC(b->stats.target); - status = VMWARE_BALLOON_CMD(GET_TARGET, limit, target); + status = VMWARE_BALLOON_CMD(GET_TARGET, limit, dummy, target); if (vmballoon_check_status(b, status)) { *new_target = target; return true; @@ -316,23 +443,46 @@ static bool vmballoon_send_get_target(struct vmballoon *b, u32 *new_target) * 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 *hv_status, unsigned int *target) { - unsigned long status, dummy; + unsigned long status, dummy = 0; u32 pfn32; pfn32 = (u32)pfn; if (pfn32 != pfn) return -1; - STATS_INC(b->stats.lock); + STATS_INC(b->stats.lock[false]); - *hv_status = status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy); + *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); + STATS_INC(b->stats.lock_fail[false]); + return 1; +} + +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 = page_to_pfn(b->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; } @@ -340,26 +490,66 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn, * 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) +static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn, + unsigned int *target) { - unsigned long status, dummy; + unsigned long status, dummy = 0; u32 pfn32; pfn32 = (u32)pfn; if (pfn32 != pfn) return false; - STATS_INC(b->stats.unlock); + STATS_INC(b->stats.unlock[false]); - status = VMWARE_BALLOON_CMD(UNLOCK, pfn, dummy); + 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); + 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 = page_to_pfn(b->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. @@ -369,91 +559,75 @@ static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn) static void vmballoon_pop(struct vmballoon *b) { struct page *page, *next; - unsigned int count = 0; - - list_for_each_entry_safe(page, next, &b->pages, lru) { - list_del(&page->lru); - __free_page(page); - STATS_INC(b->stats.free); - b->size--; - - if (++count >= b->rate_free) { - count = 0; + 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(); } } -} -/* - * 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) -{ - /* free all pages, skipping monitor unlock */ - vmballoon_pop(b); + if (b->batch_page) { + vunmap(b->batch_page); + b->batch_page = NULL; + } - if (vmballoon_send_start(b)) { - b->reset_required = false; - if (!vmballoon_send_guest_id(b)) - pr_err("failed to send guest ID to the host\n"); + if (b->page) { + __free_page(b->page); + b->page = NULL; } } /* - * Allocate (or reserve) a page for the balloon and notify the host. If host - * refuses the page put it on "refuse" list and allocate another one until host - * is satisfied. "Refused" pages are released at the end of inflation cycle - * (when we allocate b->rate_alloc pages). + * 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_reserve_page(struct vmballoon *b, bool can_sleep) +static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages, + bool is_2m_pages, unsigned int *target) { - struct page *page; - gfp_t flags; - unsigned int hv_status; - int locked; - flags = can_sleep ? VMW_PAGE_ALLOC_CANSLEEP : VMW_PAGE_ALLOC_NOSLEEP; - - do { - if (!can_sleep) - STATS_INC(b->stats.alloc); - else - STATS_INC(b->stats.sleep_alloc); + int locked, hv_status; + struct page *page = b->page; + struct vmballoon_page_size *page_size = &b->page_sizes[false]; - page = alloc_page(flags); - if (!page) { - if (!can_sleep) - STATS_INC(b->stats.alloc_fail); - else - STATS_INC(b->stats.sleep_alloc_fail); - return -ENOMEM; - } + /* is_2m_pages can never happen as 2m pages support implies batching */ - /* inform monitor */ - locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status); - if (locked > 0) { - STATS_INC(b->stats.refused_alloc); + locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status, + target); + if (locked > 0) { + STATS_INC(b->stats.refused_alloc[false]); - if (hv_status == VMW_BALLOON_ERROR_RESET || - hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED) { - __free_page(page); - return -EIO; - } + if (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. - */ - list_add(&page->lru, &b->refused_pages); - if (++b->n_refused_pages >= VMW_BALLOON_MAX_REFUSED) - 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); } - } while (locked != 0); + return -EIO; + } /* track allocated page */ - list_add(&page->lru, &b->pages); + list_add(&page->lru, &page_size->pages); /* update balloon size */ b->size++; @@ -461,21 +635,81 @@ static int vmballoon_reserve_page(struct vmballoon *b, bool can_sleep) 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_release_page(struct vmballoon *b, struct page *page) +static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages, + bool is_2m_pages, unsigned int *target) { - if (!vmballoon_send_unlock_page(b, page_to_pfn(page))) - return -EIO; + struct page *page = b->page; + struct vmballoon_page_size *page_size = &b->page_sizes[false]; - list_del(&page->lru); + /* 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 */ - __free_page(page); - STATS_INC(b->stats.free); + vmballoon_free_page(page, false); + STATS_INC(b->stats.free[false]); /* update balloon size */ b->size--; @@ -483,21 +717,76 @@ static int vmballoon_release_page(struct vmballoon *b, struct page *page) 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) +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, &b->refused_pages, lru) { + list_for_each_entry_safe(page, next, &page_size->refused_pages, lru) { list_del(&page->lru); - __free_page(page); - STATS_INC(b->stats.refused_free); + vmballoon_free_page(page, is_2m_pages); + STATS_INC(b->stats.refused_free[is_2m_pages]); } - b->n_refused_pages = 0; + 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); } /* @@ -507,12 +796,12 @@ static void vmballoon_release_refused_pages(struct vmballoon *b) */ static void vmballoon_inflate(struct vmballoon *b) { - unsigned int goal; - unsigned int rate; - unsigned int i; + unsigned rate; unsigned int allocations = 0; + unsigned int num_pages = 0; int error = 0; - bool alloc_can_sleep = false; + gfp_t flags = VMW_PAGE_ALLOC_NOSLEEP; + bool is_2m_pages; pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target); @@ -531,31 +820,51 @@ static void vmballoon_inflate(struct vmballoon *b) * slowdown page allocations considerably. */ - goal = b->target - b->size; /* * Start with no sleep allocation rate which may be higher * than sleeping allocation rate. */ - rate = b->slow_allocation_cycles ? - b->rate_alloc : VMW_BALLOON_NOSLEEP_ALLOC_MAX; + 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; - pr_debug("%s - goal: %d, no-sleep rate: %d, sleep rate: %d\n", - __func__, goal, rate, b->rate_alloc); + 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]); - for (i = 0; i < goal; i++) { + if (is_2m_pages) { + b->ops->lock(b, num_pages, true, &b->target); - error = vmballoon_reserve_page(b, alloc_can_sleep); - if (error) { - if (error != -ENOMEM) { /* - * Not a page allocation failure, stop this - * cycle. Maybe we'll get new target from - * the host soon. + * ignore errors from locking as we now switch + * to 4k pages and we might get different + * errors. */ - break; + + num_pages = 0; + is_2m_pages = false; + continue; } - if (alloc_can_sleep) { + if (flags == VMW_PAGE_ALLOC_CANSLEEP) { /* * CANSLEEP page allocation failed, so guest * is under severe memory pressure. Quickly @@ -563,6 +872,7 @@ static void vmballoon_inflate(struct vmballoon *b) */ b->rate_alloc = max(b->rate_alloc / 2, VMW_BALLOON_RATE_ALLOC_MIN); + STATS_INC(b->stats.sleep_alloc_fail); break; } @@ -576,38 +886,49 @@ static void vmballoon_inflate(struct vmballoon *b) */ b->slow_allocation_cycles = VMW_BALLOON_SLOW_CYCLES; - if (i >= b->rate_alloc) + if (allocations >= b->rate_alloc) break; - alloc_can_sleep = true; + flags = VMW_PAGE_ALLOC_CANSLEEP; /* Lower rate for sleeping allocations. */ rate = b->rate_alloc; + continue; } - if (++allocations > VMW_BALLOON_YIELD_THRESHOLD) { - cond_resched(); - allocations = 0; + 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; } - if (i >= rate) { + 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 && i >= b->rate_alloc) { - unsigned int mult = i / b->rate_alloc; + 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); + vmballoon_release_refused_pages(b, true); + vmballoon_release_refused_pages(b, false); } /* @@ -615,35 +936,176 @@ static void vmballoon_inflate(struct vmballoon *b) */ static void vmballoon_deflate(struct vmballoon *b) { - struct page *page, *next; - unsigned int i = 0; - unsigned int goal; - int error; + unsigned is_2m_pages; pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target); - /* limit deallocation rate */ - goal = min(b->size - b->target, b->rate_free); + /* 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; - pr_debug("%s - goal: %d, rate: %d\n", __func__, goal, b->rate_free); + list_del(&page->lru); + b->ops->add_page(b, num_pages++, page); - /* free pages to reach target */ - list_for_each_entry_safe(page, next, &b->pages, lru) { - error = vmballoon_release_page(b, page); - if (error) { - /* quickly decrease rate in case of error */ - b->rate_free = max(b->rate_free / 2, - VMW_BALLOON_RATE_FREE_MIN); - return; + 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 (++i >= goal) - break; + 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) +{ + b->page = alloc_page(VMW_PAGE_ALLOC_NOSLEEP); + if (!b->page) + return false; + + b->batch_page = vmap(&b->page, 1, VM_MAP, PAGE_KERNEL); + if (!b->batch_page) { + __free_page(b->page); + return false; + } + + 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; } - /* slowly increase rate if there were no errors */ - b->rate_free = min(b->rate_free + VMW_BALLOON_RATE_FREE_INC, - VMW_BALLOON_RATE_FREE_MAX); + return 0; +} + +/* + * 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"); } /* @@ -664,13 +1126,14 @@ static void vmballoon_work(struct work_struct *work) if (b->slow_allocation_cycles > 0) b->slow_allocation_cycles--; - if (vmballoon_send_get_target(b, &target)) { + 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 (b->size > target) + else if (target == 0 || + b->size > target + vmballoon_page_size(true)) vmballoon_deflate(b); } @@ -692,6 +1155,14 @@ 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" @@ -700,35 +1171,48 @@ static int vmballoon_debug_show(struct seq_file *f, void *offset) /* format rate info */ seq_printf(f, - "rateNoSleepAlloc: %8d pages/sec\n" - "rateSleepAlloc: %8d pages/sec\n" - "rateFree: %8d pages/sec\n", - VMW_BALLOON_NOSLEEP_ALLOC_MAX, - b->rate_alloc, b->rate_free); + "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" - "errFree: %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, stats->lock_fail, - stats->unlock, stats->unlock_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, stats->alloc_fail, + stats->alloc[true], stats->alloc_fail[true], + stats->alloc[false], stats->alloc_fail[false], stats->sleep_alloc, stats->sleep_alloc_fail, - stats->free, - stats->refused_alloc, stats->refused_free); + 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; } @@ -782,7 +1266,7 @@ static inline void vmballoon_debugfs_exit(struct vmballoon *b) 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. @@ -790,32 +1274,26 @@ static int __init vmballoon_init(void) if (x86_hyper != &x86_hyper_vmware) return -ENODEV; - INIT_LIST_HEAD(&balloon.pages); - INIT_LIST_HEAD(&balloon.refused_pages); + 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; - balloon.rate_free = VMW_BALLOON_RATE_FREE_MAX; INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work); - /* - * Start balloon. - */ - if (!vmballoon_send_start(&balloon)) { - pr_err("failed to send start command to the host\n"); - return -EIO; - } - - if (!vmballoon_send_guest_id(&balloon)) { - pr_err("failed to send guest ID to the host\n"); - return -EIO; - } - 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; @@ -824,6 +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); @@ -833,7 +1312,7 @@ static void __exit vmballoon_exit(void) * Reset connection before deallocating memory to avoid potential for * additional spurious resets from guest touching deallocated pages. */ - vmballoon_send_start(&balloon); + vmballoon_send_start(&balloon, 0); vmballoon_pop(&balloon); } module_exit(vmballoon_exit); |