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virtio-grants-v8

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Merge tag 'virtio-grants-v8-tag' of https://gitlab.com/sstabellini/qemu into staging

virtio-grants-v8

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# gpg: Signature made Wed 12 Jun 2024 02:25:34 PM PDT
# gpg:                using RSA key D04E33ABA51F67BA07D30AEA894F8F4870E1AE90
# gpg: Good signature from "Stefano Stabellini <stefano.stabellini@eu.citrix.com>" [unknown]
# gpg:                 aka "Stefano Stabellini <sstabellini@kernel.org>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: D04E 33AB A51F 67BA 07D3  0AEA 894F 8F48 70E1 AE90

* tag 'virtio-grants-v8-tag' of https://gitlab.com/sstabellini/qemu:
  hw/arm: xen: Enable use of grant mappings
  xen: mapcache: Add support for grant mappings
  xen: mapcache: Pass the ram_addr offset to xen_map_cache()
  xen: mapcache: Unmap first entries in buckets
  xen: mapcache: Make MCACHE_BUCKET_SHIFT runtime configurable

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-06-15 20:13:06 -07:00
commit 05ad1440b8
7 changed files with 202 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
hw/arm/xen_arm.c
View File

@ -125,6 +125,11 @@ static void xen_init_ram(MachineState *machine)
GUEST_RAM1_BASE, ram_size[1]);
memory_region_add_subregion(sysmem, GUEST_RAM1_BASE, &ram_hi);
}
/* Setup support for grants. */
memory_region_init_ram(&xen_grants, NULL, "xen.grants", block_len,
&error_fatal);
memory_region_add_subregion(sysmem, XEN_GRANT_ADDR_OFF, &xen_grants);
}
void arch_handle_ioreq(XenIOState *state, ioreq_t *req)

12
hw/xen/xen-hvm-common.c
View File

@ -10,12 +10,18 @@
#include "hw/boards.h"
#include "hw/xen/arch_hvm.h"
MemoryRegion xen_memory;
MemoryRegion xen_memory, xen_grants;
/* Check for xen memory. */
/* Check for any kind of xen memory, foreign mappings or grants. */
bool xen_mr_is_memory(MemoryRegion *mr)
{
return mr == &xen_memory;
return mr == &xen_memory || mr == &xen_grants;
}
/* Check specifically for grants. */
bool xen_mr_is_grants(MemoryRegion *mr)
{
return mr == &xen_grants;
}
void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr,

234
hw/xen/xen-mapcache.c
View File

@ -14,6 +14,7 @@
#include <sys/resource.h>
#include "hw/xen/xen-hvm-common.h"
#include "hw/xen/xen_native.h"
#include "qemu/bitmap.h"
@ -21,15 +22,14 @@
#include "sysemu/xen-mapcache.h"
#include "trace.h"
#include <xenevtchn.h>
#include <xengnttab.h>
#if HOST_LONG_BITS == 32
# define MCACHE_BUCKET_SHIFT 16
# define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */
#else
# define MCACHE_BUCKET_SHIFT 20
# define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */
#endif
#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)
/* This is the size of the virtual address space reserve to QEMU that will not
* be use by MapCache.
@ -44,6 +44,7 @@ typedef struct MapCacheEntry {
unsigned long *valid_mapping;
uint32_t lock;
#define XEN_MAPCACHE_ENTRY_DUMMY (1 << 0)
#define XEN_MAPCACHE_ENTRY_GRANT (1 << 1)
uint8_t flags;
hwaddr size;
struct MapCacheEntry *next;
@ -65,7 +66,8 @@ typedef struct MapCache {
/* For most cases (>99.9%), the page address is the same. */
MapCacheEntry *last_entry;
unsigned long max_mcache_size;
unsigned int mcache_bucket_shift;
unsigned int bucket_shift;
unsigned long bucket_size;
phys_offset_to_gaddr_t phys_offset_to_gaddr;
QemuMutex lock;
@ -73,6 +75,8 @@ typedef struct MapCache {
} MapCache;
static MapCache *mapcache;
static MapCache *mapcache_grants;
static xengnttab_handle *xen_region_gnttabdev;
static inline void mapcache_lock(MapCache *mc)
{
@ -95,11 +99,14 @@ static inline int test_bits(int nr, int size, const unsigned long *addr)
static MapCache *xen_map_cache_init_single(phys_offset_to_gaddr_t f,
void *opaque,
unsigned int bucket_shift,
unsigned long max_size)
{
unsigned long size;
MapCache *mc;
assert(bucket_shift >= XC_PAGE_SHIFT);
mc = g_new0(MapCache, 1);
mc->phys_offset_to_gaddr = f;
@ -108,12 +115,14 @@ static MapCache *xen_map_cache_init_single(phys_offset_to_gaddr_t f,
QTAILQ_INIT(&mc->locked_entries);
mc->bucket_shift = bucket_shift;
mc->bucket_size = 1UL << bucket_shift;
mc->max_mcache_size = max_size;
mc->nr_buckets =
(((mc->max_mcache_size >> XC_PAGE_SHIFT) +
(1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
(MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));
(1UL << (bucket_shift - XC_PAGE_SHIFT)) - 1) >>
(bucket_shift - XC_PAGE_SHIFT));
size = mc->nr_buckets * sizeof(MapCacheEntry);
size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
@ -126,6 +135,19 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
{
struct rlimit rlimit_as;
unsigned long max_mcache_size;
unsigned int bucket_shift;
xen_region_gnttabdev = xengnttab_open(NULL, 0);
if (xen_region_gnttabdev == NULL) {
error_report("mapcache: Failed to open gnttab device");
exit(EXIT_FAILURE);
}
if (HOST_LONG_BITS == 32) {
bucket_shift = 16;
} else {
bucket_shift = 20;
}
if (geteuid() == 0) {
rlimit_as.rlim_cur = RLIM_INFINITY;
@ -146,7 +168,18 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
}
}
mapcache = xen_map_cache_init_single(f, opaque, max_mcache_size);
mapcache = xen_map_cache_init_single(f, opaque,
bucket_shift,
max_mcache_size);
/*
* Grant mappings must use XC_PAGE_SIZE granularity since we can't
* map anything beyond the number of pages granted to us.
*/
mapcache_grants = xen_map_cache_init_single(f, opaque,
XC_PAGE_SHIFT,
max_mcache_size);
setrlimit(RLIMIT_AS, &rlimit_as);
}
@ -155,17 +188,25 @@ static void xen_remap_bucket(MapCache *mc,
void *vaddr,
hwaddr size,
hwaddr address_index,
bool dummy)
bool dummy,
bool grant,
bool is_write,
ram_addr_t ram_offset)
{
uint8_t *vaddr_base;
xen_pfn_t *pfns;
int *err;
g_autofree uint32_t *refs = NULL;
g_autofree xen_pfn_t *pfns = NULL;
g_autofree int *err;
unsigned int i;
hwaddr nb_pfn = size >> XC_PAGE_SHIFT;
trace_xen_remap_bucket(address_index);
pfns = g_new0(xen_pfn_t, nb_pfn);
if (grant) {
refs = g_new0(uint32_t, nb_pfn);
} else {
pfns = g_new0(xen_pfn_t, nb_pfn);
}
err = g_new0(int, nb_pfn);
if (entry->vaddr_base != NULL) {
@ -194,21 +235,51 @@ static void xen_remap_bucket(MapCache *mc,
g_free(entry->valid_mapping);
entry->valid_mapping = NULL;
for (i = 0; i < nb_pfn; i++) {
pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i;
if (grant) {
hwaddr grant_base = address_index - (ram_offset >> XC_PAGE_SHIFT);
for (i = 0; i < nb_pfn; i++) {
refs[i] = grant_base + i;
}
} else {
for (i = 0; i < nb_pfn; i++) {
pfns[i] = (address_index << (mc->bucket_shift - XC_PAGE_SHIFT)) + i;
}
}
/*
* If the caller has requested the mapping at a specific address use
* MAP_FIXED to make sure it's honored.
*/
entry->flags &= ~XEN_MAPCACHE_ENTRY_GRANT;
if (!dummy) {
vaddr_base = xenforeignmemory_map2(xen_fmem, xen_domid, vaddr,
PROT_READ | PROT_WRITE,
vaddr ? MAP_FIXED : 0,
nb_pfn, pfns, err);
if (grant) {
int prot = PROT_READ;
if (is_write) {
prot |= PROT_WRITE;
}
entry->flags |= XEN_MAPCACHE_ENTRY_GRANT;
assert(vaddr == NULL);
vaddr_base = xengnttab_map_domain_grant_refs(xen_region_gnttabdev,
nb_pfn,
xen_domid, refs,
prot);
} else {
/*
* If the caller has requested the mapping at a specific address use
* MAP_FIXED to make sure it's honored.
*
* We don't yet support upgrading mappings from RO to RW, to handle
* models using ordinary address_space_rw(), foreign mappings ignore
* is_write and are always mapped RW.
*/
vaddr_base = xenforeignmemory_map2(xen_fmem, xen_domid, vaddr,
PROT_READ | PROT_WRITE,
vaddr ? MAP_FIXED : 0,
nb_pfn, pfns, err);
}
if (vaddr_base == NULL) {
perror("xenforeignmemory_map2");
perror(grant ? "xengnttab_map_domain_grant_refs"
: "xenforeignmemory_map2");
exit(-1);
}
} else {
@ -247,14 +318,13 @@ static void xen_remap_bucket(MapCache *mc,
bitmap_set(entry->valid_mapping, i, 1);
}
}
g_free(pfns);
g_free(err);
}
static uint8_t *xen_map_cache_unlocked(MapCache *mc,
hwaddr phys_addr, hwaddr size,
uint8_t lock, bool dma, bool is_write)
ram_addr_t ram_offset,
uint8_t lock, bool dma,
bool grant, bool is_write)
{
MapCacheEntry *entry, *pentry = NULL,
*free_entry = NULL, *free_pentry = NULL;
@ -266,8 +336,8 @@ static uint8_t *xen_map_cache_unlocked(MapCache *mc,
bool dummy = false;
tryagain:
address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
address_index = phys_addr >> mc->bucket_shift;
address_offset = phys_addr & (mc->bucket_size - 1);
trace_xen_map_cache(phys_addr);
@ -294,14 +364,14 @@ tryagain:
return mc->last_entry->vaddr_base + address_offset;
}
/* size is always a multiple of MCACHE_BUCKET_SIZE */
/* size is always a multiple of mc->bucket_size */
if (size) {
cache_size = size + address_offset;
if (cache_size % MCACHE_BUCKET_SIZE) {
cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
if (cache_size % mc->bucket_size) {
cache_size += mc->bucket_size - (cache_size % mc->bucket_size);
}
} else {
cache_size = MCACHE_BUCKET_SIZE;
cache_size = mc->bucket_size;
}
entry = &mc->entry[address_index % mc->nr_buckets];
@ -325,14 +395,16 @@ tryagain:
if (!entry) {
entry = g_new0(MapCacheEntry, 1);
pentry->next = entry;
xen_remap_bucket(mc, entry, NULL, cache_size, address_index, dummy);
xen_remap_bucket(mc, entry, NULL, cache_size, address_index, dummy,
grant, is_write, ram_offset);
} else if (!entry->lock) {
if (!entry->vaddr_base || entry->paddr_index != address_index ||
entry->size != cache_size ||
!test_bits(address_offset >> XC_PAGE_SHIFT,
test_bit_size >> XC_PAGE_SHIFT,
entry->valid_mapping)) {
xen_remap_bucket(mc, entry, NULL, cache_size, address_index, dummy);
xen_remap_bucket(mc, entry, NULL, cache_size, address_index, dummy,
grant, is_write, ram_offset);
}
}
@ -379,14 +451,30 @@ tryagain:
uint8_t *xen_map_cache(MemoryRegion *mr,
hwaddr phys_addr, hwaddr size,
ram_addr_t ram_addr_offset,
uint8_t lock, bool dma,
bool is_write)
{
bool grant = xen_mr_is_grants(mr);
MapCache *mc = grant ? mapcache_grants : mapcache;
uint8_t *p;
mapcache_lock(mapcache);
p = xen_map_cache_unlocked(mapcache, phys_addr, size, lock, dma, is_write);
mapcache_unlock(mapcache);
if (grant && !lock) {
/*
* Grants are only supported via address_space_map(). Anything
* else is considered a user/guest error.
*
* QEMU generally doesn't expect these mappings to ever fail, so
* if this happens we report an error message and abort().
*/
error_report("Tried to access a grant reference without mapping it.");
abort();
}
mapcache_lock(mc);
p = xen_map_cache_unlocked(mc, phys_addr, size, ram_addr_offset,
lock, dma, grant, is_write);
mapcache_unlock(mc);
return p;
}
@ -422,7 +510,7 @@ static ram_addr_t xen_ram_addr_from_mapcache_single(MapCache *mc, void *ptr)
trace_xen_ram_addr_from_mapcache_not_in_cache(ptr);
raddr = RAM_ADDR_INVALID;
} else {
raddr = (reventry->paddr_index << MCACHE_BUCKET_SHIFT) +
raddr = (reventry->paddr_index << mc->bucket_shift) +
((unsigned long) ptr - (unsigned long) entry->vaddr_base);
}
mapcache_unlock(mc);
@ -431,7 +519,14 @@ static ram_addr_t xen_ram_addr_from_mapcache_single(MapCache *mc, void *ptr)
ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
{
return xen_ram_addr_from_mapcache_single(mapcache, ptr);
ram_addr_t addr;
addr = xen_ram_addr_from_mapcache_single(mapcache, ptr);
if (addr == RAM_ADDR_INVALID) {
addr = xen_ram_addr_from_mapcache_single(mapcache_grants, ptr);
}
return addr;
}
static void xen_invalidate_map_cache_entry_unlocked(MapCache *mc,
@ -442,6 +537,7 @@ static void xen_invalidate_map_cache_entry_unlocked(MapCache *mc,
hwaddr paddr_index;
hwaddr size;
int found = 0;
int rc;
QTAILQ_FOREACH(reventry, &mc->locked_entries, next) {
if (reventry->vaddr_req == buffer) {
@ -479,18 +575,30 @@ static void xen_invalidate_map_cache_entry_unlocked(MapCache *mc,
return;
}
entry->lock--;
if (entry->lock > 0 || pentry == NULL) {
if (entry->lock > 0) {
return;
}
pentry->next = entry->next;
ram_block_notify_remove(entry->vaddr_base, entry->size, entry->size);
if (munmap(entry->vaddr_base, entry->size) != 0) {
if (entry->flags & XEN_MAPCACHE_ENTRY_GRANT) {
rc = xengnttab_unmap(xen_region_gnttabdev, entry->vaddr_base,
entry->size >> mc->bucket_shift);
} else {
rc = munmap(entry->vaddr_base, entry->size);
}
if (rc) {
perror("unmap fails");
exit(-1);
}
g_free(entry->valid_mapping);
g_free(entry);
if (pentry) {
pentry->next = entry->next;
g_free(entry);
} else {
memset(entry, 0, sizeof *entry);
}
}
typedef struct XenMapCacheData {
@ -498,14 +606,24 @@ typedef struct XenMapCacheData {
uint8_t *buffer;
} XenMapCacheData;
static void xen_invalidate_map_cache_entry_single(MapCache *mc, uint8_t *buffer)
{
mapcache_lock(mc);
xen_invalidate_map_cache_entry_unlocked(mc, buffer);
mapcache_unlock(mc);
}
static void xen_invalidate_map_cache_entry_all(uint8_t *buffer)
{
xen_invalidate_map_cache_entry_single(mapcache, buffer);
xen_invalidate_map_cache_entry_single(mapcache_grants, buffer);
}
static void xen_invalidate_map_cache_entry_bh(void *opaque)
{
XenMapCacheData *data = opaque;
mapcache_lock(mapcache);
xen_invalidate_map_cache_entry_unlocked(mapcache, data->buffer);
mapcache_unlock(mapcache);
xen_invalidate_map_cache_entry_all(data->buffer);
aio_co_wake(data->co);
}
@ -520,9 +638,7 @@ void coroutine_mixed_fn xen_invalidate_map_cache_entry(uint8_t *buffer)
xen_invalidate_map_cache_entry_bh, &data);
qemu_coroutine_yield();
} else {
mapcache_lock(mapcache);
xen_invalidate_map_cache_entry_unlocked(mapcache, buffer);
mapcache_unlock(mapcache);
xen_invalidate_map_cache_entry_all(buffer);
}
}
@ -574,6 +690,7 @@ void xen_invalidate_map_cache(void)
bdrv_drain_all();
xen_invalidate_map_cache_single(mapcache);
xen_invalidate_map_cache_single(mapcache_grants);
}
static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc,
@ -585,8 +702,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc,
hwaddr address_index, address_offset;
hwaddr test_bit_size, cache_size = size;
address_index = old_phys_addr >> MCACHE_BUCKET_SHIFT;
address_offset = old_phys_addr & (MCACHE_BUCKET_SIZE - 1);
address_index = old_phys_addr >> mc->bucket_shift;
address_offset = old_phys_addr & (mc->bucket_size - 1);
assert(size);
/* test_bit_size is always a multiple of XC_PAGE_SIZE */
@ -595,8 +712,8 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc,
test_bit_size += XC_PAGE_SIZE - (test_bit_size % XC_PAGE_SIZE);
}
cache_size = size + address_offset;
if (cache_size % MCACHE_BUCKET_SIZE) {
cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
if (cache_size % mc->bucket_size) {
cache_size += mc->bucket_size - (cache_size % mc->bucket_size);
}
entry = &mc->entry[address_index % mc->nr_buckets];
@ -609,13 +726,16 @@ static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc,
return NULL;
}
address_index = new_phys_addr >> MCACHE_BUCKET_SHIFT;
address_offset = new_phys_addr & (MCACHE_BUCKET_SIZE - 1);
assert((entry->flags & XEN_MAPCACHE_ENTRY_GRANT) == 0);
address_index = new_phys_addr >> mc->bucket_shift;
address_offset = new_phys_addr & (mc->bucket_size - 1);
trace_xen_replace_cache_entry_dummy(old_phys_addr, new_phys_addr);
xen_remap_bucket(mc, entry, entry->vaddr_base,
cache_size, address_index, false);
cache_size, address_index, false,
false, false, old_phys_addr);
if (!test_bits(address_offset >> XC_PAGE_SHIFT,
test_bit_size >> XC_PAGE_SHIFT,
entry->valid_mapping)) {

3
include/hw/xen/xen-hvm-common.h
View File

@ -16,6 +16,7 @@
#include <xen/hvm/ioreq.h>
extern MemoryRegion xen_memory;
extern MemoryRegion xen_grants;
extern MemoryListener xen_io_listener;
extern DeviceListener xen_device_listener;
@ -29,6 +30,8 @@ extern DeviceListener xen_device_listener;
do { } while (0)
#endif
#define XEN_GRANT_ADDR_OFF (1ULL << 63)
static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
{
return shared_page->vcpu_ioreq[i].vp_eport;

2
include/sysemu/xen-mapcache.h
View File

@ -19,6 +19,7 @@ typedef hwaddr (*phys_offset_to_gaddr_t)(hwaddr phys_offset,
void xen_map_cache_init(phys_offset_to_gaddr_t f,
void *opaque);
uint8_t *xen_map_cache(MemoryRegion *mr, hwaddr phys_addr, hwaddr size,
ram_addr_t ram_addr_offset,
uint8_t lock, bool dma,
bool is_write);
ram_addr_t xen_ram_addr_from_mapcache(void *ptr);
@ -37,6 +38,7 @@ static inline void xen_map_cache_init(phys_offset_to_gaddr_t f,
static inline uint8_t *xen_map_cache(MemoryRegion *mr,
hwaddr phys_addr,
hwaddr size,
ram_addr_t ram_addr_offset,
uint8_t lock,
bool dma,
bool is_write)

1
include/sysemu/xen.h
View File

@ -50,4 +50,5 @@ static inline void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
#endif /* CONFIG_XEN_IS_POSSIBLE */
bool xen_mr_is_memory(MemoryRegion *mr);
bool xen_mr_is_grants(MemoryRegion *mr);
#endif

9
system/physmem.c
View File

@ -2231,13 +2231,14 @@ static void *qemu_ram_ptr_length(RAMBlock *block, ram_addr_t addr,
*/
if (xen_mr_is_memory(block->mr)) {
return xen_map_cache(block->mr, block->offset + addr,
len, lock, lock,
is_write);
len, block->offset,
lock, lock, is_write);
}
block->host = xen_map_cache(block->mr, block->offset,
block->max_length, 1,
lock, is_write);
block->max_length,
block->offset,
1, lock, is_write);
}
return ramblock_ptr(block, addr);