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Merge remote-tracking branch 'qemu-kvm/uq/master' into staging 

# By Alex Williamson (1) and others
# Via Paolo Bonzini
* qemu-kvm/uq/master:
  target-i386: fix cpuid leaf 0x0d
  qemu: mempath: prefault pages manually (v4)
  kvm: Query KVM for available memory slots

Message-id: 1386345276-9803-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Anthony Liguori <aliguori@amazon.com>
This commit is contained in:
Anthony Liguori 2013-12-07 07:35:25 -08:00
parent 3c88da3c24 33f373d7c5
commit 0c0cb6a237
5 changed files with 71 additions and 30 deletions
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59
exec.c
View File

@ -904,6 +904,13 @@ static long gethugepagesize(const char *path)
return fs.f_bsize;
}
static sigjmp_buf sigjump;
static void sigbus_handler(int signal)
{
siglongjmp(sigjump, 1);
}
static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
const char *path)
@ -913,9 +920,6 @@ static void *file_ram_alloc(RAMBlock *block,
char *c;
void *area;
int fd;
#ifdef MAP_POPULATE
int flags;
#endif
unsigned long hpagesize;
hpagesize = gethugepagesize(path);
@ -963,21 +967,52 @@ static void *file_ram_alloc(RAMBlock *block,
if (ftruncate(fd, memory))
perror("ftruncate");
#ifdef MAP_POPULATE
/* NB: MAP_POPULATE won't exhaustively alloc all phys pages in the case
* MAP_PRIVATE is requested. For mem_prealloc we mmap as MAP_SHARED
* to sidestep this quirk.
*/
flags = mem_prealloc ? MAP_POPULATE | MAP_SHARED : MAP_PRIVATE;
area = mmap(0, memory, PROT_READ | PROT_WRITE, flags, fd, 0);
#else
area = mmap(0, memory, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
#endif
if (area == MAP_FAILED) {
perror("file_ram_alloc: can't mmap RAM pages");
close(fd);
return (NULL);
}
if (mem_prealloc) {
int ret, i;
struct sigaction act, oldact;
sigset_t set, oldset;
memset(&act, 0, sizeof(act));
act.sa_handler = &sigbus_handler;
act.sa_flags = 0;
ret = sigaction(SIGBUS, &act, &oldact);
if (ret) {
perror("file_ram_alloc: failed to install signal handler");
exit(1);
}
/* unblock SIGBUS */
sigemptyset(&set);
sigaddset(&set, SIGBUS);
pthread_sigmask(SIG_UNBLOCK, &set, &oldset);
if (sigsetjmp(sigjump, 1)) {
fprintf(stderr, "file_ram_alloc: failed to preallocate pages\n");
exit(1);
}
/* MAP_POPULATE silently ignores failures */
for (i = 0; i < (memory/hpagesize)-1; i++) {
memset(area + (hpagesize*i), 0, 1);
}
ret = sigaction(SIGBUS, &oldact, NULL);
if (ret) {
perror("file_ram_alloc: failed to reinstall signal handler");
exit(1);
}
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
}
block->fd = fd;
return area;
}

30
kvm-all.c
View File

@ -72,7 +72,8 @@ typedef struct kvm_dirty_log KVMDirtyLog;
struct KVMState
{
KVMSlot slots[32];
KVMSlot *slots;
int nr_slots;
int fd;
int vmfd;
int coalesced_mmio;
@ -125,7 +126,7 @@ static KVMSlot *kvm_alloc_slot(KVMState *s)
{
int i;
for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
for (i = 0; i < s->nr_slots; i++) {
if (s->slots[i].memory_size == 0) {
return &s->slots[i];
}
@ -141,7 +142,7 @@ static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
{
int i;
for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
for (i = 0; i < s->nr_slots; i++) {
KVMSlot *mem = &s->slots[i];
if (start_addr == mem->start_addr &&
@ -163,7 +164,7 @@ static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,
KVMSlot *found = NULL;
int i;
for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
for (i = 0; i < s->nr_slots; i++) {
KVMSlot *mem = &s->slots[i];
if (mem->memory_size == 0 ||
@ -185,7 +186,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
{
int i;
for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
for (i = 0; i < s->nr_slots; i++) {
KVMSlot *mem = &s->slots[i];
if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
@ -357,7 +358,7 @@ static int kvm_set_migration_log(int enable)
s->migration_log = enable;
for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
for (i = 0; i < s->nr_slots; i++) {
mem = &s->slots[i];
if (!mem->memory_size) {
@ -1383,9 +1384,6 @@ int kvm_init(void)
#ifdef KVM_CAP_SET_GUEST_DEBUG
QTAILQ_INIT(&s->kvm_sw_breakpoints);
#endif
for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
s->slots[i].slot = i;
}
s->vmfd = -1;
s->fd = qemu_open("/dev/kvm", O_RDWR);
if (s->fd == -1) {
@ -1409,6 +1407,19 @@ int kvm_init(void)
goto err;
}
s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
/* If unspecified, use the default value */
if (!s->nr_slots) {
s->nr_slots = 32;
}
s->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot));
for (i = 0; i < s->nr_slots; i++) {
s->slots[i].slot = i;
}
/* check the vcpu limits */
soft_vcpus_limit = kvm_recommended_vcpus(s);
hard_vcpus_limit = kvm_max_vcpus(s);
@ -1527,6 +1538,7 @@ err:
if (s->fd != -1) {
close(s->fd);
}
g_free(s->slots);
g_free(s);
return ret;

2
qemu-options.hx
View File

@ -228,7 +228,6 @@ STEXI
Allocate guest RAM from a temporarily created file in @var{path}.
ETEXI
#ifdef MAP_POPULATE
DEF("mem-prealloc", 0, QEMU_OPTION_mem_prealloc,
"-mem-prealloc preallocate guest memory (use with -mem-path)\n",
QEMU_ARCH_ALL)
@ -237,7 +236,6 @@ STEXI
@findex -mem-prealloc
Preallocate memory when using -mem-path.
ETEXI
#endif
DEF("k", HAS_ARG, QEMU_OPTION_k,
"-k language use keyboard layout (for example 'fr' for French)\n",

6
target-i386/cpu.c
View File

@ -335,7 +335,7 @@ typedef struct ExtSaveArea {
static const ExtSaveArea ext_save_areas[] = {
[2] = { .feature = FEAT_1_ECX, .bits = CPUID_EXT_AVX,
.offset = 0x100, .size = 0x240 },
.offset = 0x240, .size = 0x100 },
};
const char *get_register_name_32(unsigned int reg)
@ -2227,8 +2227,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
const ExtSaveArea *esa = &ext_save_areas[count];
if ((env->features[esa->feature] & esa->bits) == esa->bits &&
(kvm_mask & (1 << count)) != 0) {
*eax = esa->offset;
*ebx = esa->size;
*eax = esa->size;
*ebx = esa->offset;
}
}
break;

4
vl.c
View File

@ -188,9 +188,7 @@ static int display_remote;
const char* keyboard_layout = NULL;
ram_addr_t ram_size;
const char *mem_path = NULL;
#ifdef MAP_POPULATE
int mem_prealloc = 0; /* force preallocation of physical target memory */
#endif
int nb_nics;
NICInfo nd_table[MAX_NICS];
int autostart;
@ -3211,11 +3209,9 @@ int main(int argc, char **argv, char **envp)
case QEMU_OPTION_mempath:
mem_path = optarg;
break;
#ifdef MAP_POPULATE
case QEMU_OPTION_mem_prealloc:
mem_prealloc = 1;
break;
#endif
case QEMU_OPTION_d:
log_mask = optarg;
break;