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KVM: Fix memory slot management functions for guest smp 

The memory slot management functions were oriented against vcpu 0, where
they should be kvm-wide.  This causes hangs starting X on guest smp.

Fix by making the functions (and resultant tail in the mmu) non-vcpu-specific.
Unfortunately this reduces the efficiency of the mmu object cache a bit.  We
may have to revisit this later.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-07-17 13:04:56 +03:00
parent d55e2cb201
commit 90cb0529dd
3 changed files with 52 additions and 123 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/kvm/kvm.h
View File

@ -535,8 +535,8 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu);
int kvm_mmu_setup(struct kvm_vcpu *vcpu);
int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
void kvm_mmu_zap_all(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
void kvm_mmu_zap_all(struct kvm *kvm);
hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)

68
drivers/kvm/kvm_main.c
View File

@ -238,23 +238,6 @@ static void vcpu_load(struct kvm_vcpu *vcpu)
kvm_arch_ops->vcpu_load(vcpu);
}
/*
* Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
* if the slot is not populated.
*/
static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
{
struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
mutex_lock(&vcpu->mutex);
if (!vcpu->vmcs) {
mutex_unlock(&vcpu->mutex);
return NULL;
}
kvm_arch_ops->vcpu_load(vcpu);
return vcpu;
}
static void vcpu_put(struct kvm_vcpu *vcpu)
{
kvm_arch_ops->vcpu_put(vcpu);
@ -663,13 +646,6 @@ void fx_init(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(fx_init);
static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
{
spin_lock(&vcpu->kvm->lock);
kvm_mmu_slot_remove_write_access(vcpu, slot);
spin_unlock(&vcpu->kvm->lock);
}
/*
* Allocate some memory and give it an address in the guest physical address
* space.
@ -792,20 +768,11 @@ static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
*memslot = new;
++kvm->memory_config_version;
kvm_mmu_slot_remove_write_access(kvm, mem->slot);
kvm_flush_remote_tlbs(kvm);
spin_unlock(&kvm->lock);
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
struct kvm_vcpu *vcpu;
vcpu = vcpu_load_slot(kvm, i);
if (!vcpu)
continue;
if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
do_remove_write_access(vcpu, mem->slot);
kvm_mmu_reset_context(vcpu);
vcpu_put(vcpu);
}
kvm_free_physmem_slot(&old, &new);
return 0;
@ -826,7 +793,6 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
struct kvm_memory_slot *memslot;
int r, i;
int n;
int cleared;
unsigned long any = 0;
spin_lock(&kvm->lock);
@ -855,23 +821,11 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
goto out;
if (any) {
cleared = 0;
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
struct kvm_vcpu *vcpu;
vcpu = vcpu_load_slot(kvm, i);
if (!vcpu)
continue;
if (!cleared) {
do_remove_write_access(vcpu, log->slot);
memset(memslot->dirty_bitmap, 0, n);
cleared = 1;
}
kvm_arch_ops->tlb_flush(vcpu);
vcpu_put(vcpu);
}
}
spin_lock(&kvm->lock);
kvm_mmu_slot_remove_write_access(kvm, log->slot);
kvm_flush_remote_tlbs(kvm);
memset(memslot->dirty_bitmap, 0, n);
spin_unlock(&kvm->lock);
r = 0;
@ -920,13 +874,9 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
break;
kvm->naliases = n;
spin_unlock(&kvm->lock);
kvm_mmu_zap_all(kvm);
vcpu_load(&kvm->vcpus[0]);
spin_lock(&kvm->lock);
kvm_mmu_zap_all(&kvm->vcpus[0]);
spin_unlock(&kvm->lock);
vcpu_put(&kvm->vcpus[0]);
return 0;

103
drivers/kvm/mmu.c
View File

@ -281,24 +281,15 @@ static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc,
return p;
}
static void mmu_memory_cache_free(struct kvm_mmu_memory_cache *mc, void *obj)
{
if (mc->nobjs < KVM_NR_MEM_OBJS)
mc->objects[mc->nobjs++] = obj;
else
kfree(obj);
}
static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu)
{
return mmu_memory_cache_alloc(&vcpu->mmu_pte_chain_cache,
sizeof(struct kvm_pte_chain));
}
static void mmu_free_pte_chain(struct kvm_vcpu *vcpu,
struct kvm_pte_chain *pc)
static void mmu_free_pte_chain(struct kvm_pte_chain *pc)
{
mmu_memory_cache_free(&vcpu->mmu_pte_chain_cache, pc);
kfree(pc);
}
static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu)
@ -307,10 +298,9 @@ static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu)
sizeof(struct kvm_rmap_desc));
}
static void mmu_free_rmap_desc(struct kvm_vcpu *vcpu,
struct kvm_rmap_desc *rd)
static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd)
{
mmu_memory_cache_free(&vcpu->mmu_rmap_desc_cache, rd);
kfree(rd);
}
/*
@ -355,8 +345,7 @@ static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte)
}
}
static void rmap_desc_remove_entry(struct kvm_vcpu *vcpu,
struct page *page,
static void rmap_desc_remove_entry(struct page *page,
struct kvm_rmap_desc *desc,
int i,
struct kvm_rmap_desc *prev_desc)
@ -376,10 +365,10 @@ static void rmap_desc_remove_entry(struct kvm_vcpu *vcpu,
prev_desc->more = desc->more;
else
set_page_private(page,(unsigned long)desc->more | 1);
mmu_free_rmap_desc(vcpu, desc);
mmu_free_rmap_desc(desc);
}
static void rmap_remove(struct kvm_vcpu *vcpu, u64 *spte)
static void rmap_remove(u64 *spte)
{
struct page *page;
struct kvm_rmap_desc *desc;
@ -407,7 +396,7 @@ static void rmap_remove(struct kvm_vcpu *vcpu, u64 *spte)
while (desc) {
for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i)
if (desc->shadow_ptes[i] == spte) {
rmap_desc_remove_entry(vcpu, page,
rmap_desc_remove_entry(page,
desc, i,
prev_desc);
return;
@ -442,7 +431,7 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)
BUG_ON(!(*spte & PT_PRESENT_MASK));
BUG_ON(!(*spte & PT_WRITABLE_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
rmap_remove(vcpu, spte);
rmap_remove(spte);
set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
kvm_flush_remote_tlbs(vcpu->kvm);
}
@ -464,14 +453,14 @@ static int is_empty_shadow_page(u64 *spt)
}
#endif
static void kvm_mmu_free_page(struct kvm_vcpu *vcpu,
static void kvm_mmu_free_page(struct kvm *kvm,
struct kvm_mmu_page *page_head)
{
ASSERT(is_empty_shadow_page(page_head->spt));
list_del(&page_head->link);
mmu_memory_cache_free(&vcpu->mmu_page_cache, page_head->spt);
mmu_memory_cache_free(&vcpu->mmu_page_header_cache, page_head);
++vcpu->kvm->n_free_mmu_pages;
kfree(page_head->spt);
kfree(page_head);
++kvm->n_free_mmu_pages;
}
static unsigned kvm_page_table_hashfn(gfn_t gfn)
@ -537,8 +526,7 @@ static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu,
pte_chain->parent_ptes[0] = parent_pte;
}
static void mmu_page_remove_parent_pte(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *page,
static void mmu_page_remove_parent_pte(struct kvm_mmu_page *page,
u64 *parent_pte)
{
struct kvm_pte_chain *pte_chain;
@ -565,7 +553,7 @@ static void mmu_page_remove_parent_pte(struct kvm_vcpu *vcpu,
pte_chain->parent_ptes[i] = NULL;
if (i == 0) {
hlist_del(&pte_chain->link);
mmu_free_pte_chain(vcpu, pte_chain);
mmu_free_pte_chain(pte_chain);
if (hlist_empty(&page->parent_ptes)) {
page->multimapped = 0;
page->parent_pte = NULL;
@ -643,7 +631,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
return page;
}
static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu,
static void kvm_mmu_page_unlink_children(struct kvm *kvm,
struct kvm_mmu_page *page)
{
unsigned i;
@ -655,10 +643,10 @@ static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu,
if (page->role.level == PT_PAGE_TABLE_LEVEL) {
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
if (pt[i] & PT_PRESENT_MASK)
rmap_remove(vcpu, &pt[i]);
rmap_remove(&pt[i]);
pt[i] = 0;
}
kvm_flush_remote_tlbs(vcpu->kvm);
kvm_flush_remote_tlbs(kvm);
return;
}
@ -669,19 +657,18 @@ static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu,
if (!(ent & PT_PRESENT_MASK))
continue;
ent &= PT64_BASE_ADDR_MASK;
mmu_page_remove_parent_pte(vcpu, page_header(ent), &pt[i]);
mmu_page_remove_parent_pte(page_header(ent), &pt[i]);
}
kvm_flush_remote_tlbs(vcpu->kvm);
kvm_flush_remote_tlbs(kvm);
}
static void kvm_mmu_put_page(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *page,
static void kvm_mmu_put_page(struct kvm_mmu_page *page,
u64 *parent_pte)
{
mmu_page_remove_parent_pte(vcpu, page, parent_pte);
mmu_page_remove_parent_pte(page, parent_pte);
}
static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu,
static void kvm_mmu_zap_page(struct kvm *kvm,
struct kvm_mmu_page *page)
{
u64 *parent_pte;
@ -697,15 +684,15 @@ static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu,
parent_pte = chain->parent_ptes[0];
}
BUG_ON(!parent_pte);
kvm_mmu_put_page(vcpu, page, parent_pte);
kvm_mmu_put_page(page, parent_pte);
set_shadow_pte(parent_pte, 0);
}
kvm_mmu_page_unlink_children(vcpu, page);
kvm_mmu_page_unlink_children(kvm, page);
if (!page->root_count) {
hlist_del(&page->hash_link);
kvm_mmu_free_page(vcpu, page);
kvm_mmu_free_page(kvm, page);
} else
list_move(&page->link, &vcpu->kvm->active_mmu_pages);
list_move(&page->link, &kvm->active_mmu_pages);
}
static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn)
@ -724,7 +711,7 @@ static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn)
if (page->gfn == gfn && !page->role.metaphysical) {
pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn,
page->role.word);
kvm_mmu_zap_page(vcpu, page);
kvm_mmu_zap_page(vcpu->kvm, page);
r = 1;
}
return r;
@ -737,7 +724,7 @@ static void mmu_unshadow(struct kvm_vcpu *vcpu, gfn_t gfn)
while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) {
pgprintk("%s: zap %lx %x\n",
__FUNCTION__, gfn, page->role.word);
kvm_mmu_zap_page(vcpu, page);
kvm_mmu_zap_page(vcpu->kvm, page);
}
}
@ -1089,10 +1076,10 @@ static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
pte = *spte;
if (is_present_pte(pte)) {
if (page->role.level == PT_PAGE_TABLE_LEVEL)
rmap_remove(vcpu, spte);
rmap_remove(spte);
else {
child = page_header(pte & PT64_BASE_ADDR_MASK);
mmu_page_remove_parent_pte(vcpu, child, spte);
mmu_page_remove_parent_pte(child, spte);
}
}
*spte = 0;
@ -1161,7 +1148,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
*/
pgprintk("misaligned: gpa %llx bytes %d role %x\n",
gpa, bytes, page->role.word);
kvm_mmu_zap_page(vcpu, page);
kvm_mmu_zap_page(vcpu->kvm, page);
continue;
}
page_offset = offset;
@ -1207,7 +1194,7 @@ void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
page = container_of(vcpu->kvm->active_mmu_pages.prev,
struct kvm_mmu_page, link);
kvm_mmu_zap_page(vcpu, page);
kvm_mmu_zap_page(vcpu->kvm, page);
}
}
EXPORT_SYMBOL_GPL(kvm_mmu_free_some_pages);
@ -1219,7 +1206,7 @@ static void free_mmu_pages(struct kvm_vcpu *vcpu)
while (!list_empty(&vcpu->kvm->active_mmu_pages)) {
page = container_of(vcpu->kvm->active_mmu_pages.next,
struct kvm_mmu_page, link);
kvm_mmu_zap_page(vcpu, page);
kvm_mmu_zap_page(vcpu->kvm, page);
}
free_page((unsigned long)vcpu->mmu.pae_root);
}
@ -1277,9 +1264,8 @@ void kvm_mmu_destroy(struct kvm_vcpu *vcpu)
mmu_free_memory_caches(vcpu);
}
void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot)
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
{
struct kvm *kvm = vcpu->kvm;
struct kvm_mmu_page *page;
list_for_each_entry(page, &kvm->active_mmu_pages, link) {
@ -1293,27 +1279,20 @@ void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot)
for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
/* avoid RMW */
if (pt[i] & PT_WRITABLE_MASK) {
rmap_remove(vcpu, &pt[i]);
rmap_remove(&pt[i]);
pt[i] &= ~PT_WRITABLE_MASK;
}
}
}
void kvm_mmu_zap_all(struct kvm_vcpu *vcpu)
void kvm_mmu_zap_all(struct kvm *kvm)
{
destroy_kvm_mmu(vcpu);
struct kvm_mmu_page *page, *node;
while (!list_empty(&vcpu->kvm->active_mmu_pages)) {
struct kvm_mmu_page *page;
list_for_each_entry_safe(page, node, &kvm->active_mmu_pages, link)
kvm_mmu_zap_page(kvm, page);
page = container_of(vcpu->kvm->active_mmu_pages.next,
struct kvm_mmu_page, link);
kvm_mmu_zap_page(vcpu, page);
}
mmu_free_memory_caches(vcpu);
kvm_flush_remote_tlbs(vcpu->kvm);
init_kvm_mmu(vcpu);
kvm_flush_remote_tlbs(kvm);
}
void kvm_mmu_module_exit(void)