* the COPYING file in the top-level directory.
*
*/
+
+#include "vmx.h"
+#include "kvm.h"
+
#include <linux/types.h>
#include <linux/string.h>
-#include <asm/page.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/module.h>
-#include "vmx.h"
-#include "kvm.h"
+#include <asm/page.h>
+#include <asm/cmpxchg.h>
#undef MMU_DEBUG
#define PT32_DIR_PSE36_MASK (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
-#define PT32_PTE_COPY_MASK \
- (PT_PRESENT_MASK | PT_ACCESSED_MASK | PT_DIRTY_MASK | PT_GLOBAL_MASK)
-
-#define PT64_PTE_COPY_MASK (PT64_NX_MASK | PT32_PTE_COPY_MASK)
-
#define PT_FIRST_AVAIL_BITS_SHIFT 9
#define PT64_SECOND_AVAIL_BITS_SHIFT 52
-#define PT_SHADOW_PS_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
#define PT_SHADOW_IO_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
-#define PT_SHADOW_WRITABLE_SHIFT (PT_FIRST_AVAIL_BITS_SHIFT + 1)
-#define PT_SHADOW_WRITABLE_MASK (1ULL << PT_SHADOW_WRITABLE_SHIFT)
-
-#define PT_SHADOW_USER_SHIFT (PT_SHADOW_WRITABLE_SHIFT + 1)
-#define PT_SHADOW_USER_MASK (1ULL << (PT_SHADOW_USER_SHIFT))
-
-#define PT_SHADOW_BITS_OFFSET (PT_SHADOW_WRITABLE_SHIFT - PT_WRITABLE_SHIFT)
-
#define VALID_PAGE(x) ((x) != INVALID_PAGE)
#define PT64_LEVEL_BITS 9
static struct kmem_cache *pte_chain_cache;
static struct kmem_cache *rmap_desc_cache;
+static struct kmem_cache *mmu_page_cache;
+static struct kmem_cache *mmu_page_header_cache;
static int is_write_protection(struct kvm_vcpu *vcpu)
{
== (PT_WRITABLE_MASK | PT_PRESENT_MASK);
}
+static void set_shadow_pte(u64 *sptep, u64 spte)
+{
+#ifdef CONFIG_X86_64
+ set_64bit((unsigned long *)sptep, spte);
+#else
+ set_64bit((unsigned long long *)sptep, spte);
+#endif
+}
+
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
struct kmem_cache *base_cache, int min,
gfp_t gfp_flags)
goto out;
r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache,
rmap_desc_cache, 1, gfp_flags);
+ if (r)
+ goto out;
+ r = mmu_topup_memory_cache(&vcpu->mmu_page_cache,
+ mmu_page_cache, 4, gfp_flags);
+ if (r)
+ goto out;
+ r = mmu_topup_memory_cache(&vcpu->mmu_page_header_cache,
+ mmu_page_header_cache, 4, gfp_flags);
out:
return r;
}
{
mmu_free_memory_cache(&vcpu->mmu_pte_chain_cache);
mmu_free_memory_cache(&vcpu->mmu_rmap_desc_cache);
+ mmu_free_memory_cache(&vcpu->mmu_page_cache);
+ mmu_free_memory_cache(&vcpu->mmu_page_header_cache);
}
static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc,
BUG_ON(!(*spte & PT_WRITABLE_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
rmap_remove(vcpu, spte);
- kvm_arch_ops->tlb_flush(vcpu);
- *spte &= ~(u64)PT_WRITABLE_MASK;
+ set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
+ kvm_flush_remote_tlbs(vcpu->kvm);
}
}
#ifdef MMU_DEBUG
-static int is_empty_shadow_page(hpa_t page_hpa)
+static int is_empty_shadow_page(u64 *spt)
{
u64 *pos;
u64 *end;
- for (pos = __va(page_hpa), end = pos + PAGE_SIZE / sizeof(u64);
- pos != end; pos++)
+ for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++)
if (*pos != 0) {
printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__,
pos, *pos);
}
#endif
-static void kvm_mmu_free_page(struct kvm_vcpu *vcpu, hpa_t page_hpa)
+static void kvm_mmu_free_page(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *page_head)
{
- struct kvm_mmu_page *page_head = page_header(page_hpa);
-
- ASSERT(is_empty_shadow_page(page_hpa));
- page_head->page_hpa = page_hpa;
- list_move(&page_head->link, &vcpu->free_pages);
+ 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;
}
{
struct kvm_mmu_page *page;
- if (list_empty(&vcpu->free_pages))
+ if (!vcpu->kvm->n_free_mmu_pages)
return NULL;
- page = list_entry(vcpu->free_pages.next, struct kvm_mmu_page, link);
- list_move(&page->link, &vcpu->kvm->active_mmu_pages);
- ASSERT(is_empty_shadow_page(page->page_hpa));
+ page = mmu_memory_cache_alloc(&vcpu->mmu_page_header_cache,
+ sizeof *page);
+ page->spt = mmu_memory_cache_alloc(&vcpu->mmu_page_cache, PAGE_SIZE);
+ set_page_private(virt_to_page(page->spt), (unsigned long)page);
+ list_add(&page->link, &vcpu->kvm->active_mmu_pages);
+ ASSERT(is_empty_shadow_page(page->spt));
page->slot_bitmap = 0;
page->multimapped = 0;
page->parent_pte = parent_pte;
u64 *pt;
u64 ent;
- pt = __va(page->page_hpa);
+ pt = page->spt;
if (page->role.level == PT_PAGE_TABLE_LEVEL) {
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
rmap_remove(vcpu, &pt[i]);
pt[i] = 0;
}
- kvm_arch_ops->tlb_flush(vcpu);
+ kvm_flush_remote_tlbs(vcpu->kvm);
return;
}
ent &= PT64_BASE_ADDR_MASK;
mmu_page_remove_parent_pte(vcpu, page_header(ent), &pt[i]);
}
+ kvm_flush_remote_tlbs(vcpu->kvm);
}
static void kvm_mmu_put_page(struct kvm_vcpu *vcpu,
}
BUG_ON(!parent_pte);
kvm_mmu_put_page(vcpu, page, parent_pte);
- *parent_pte = 0;
+ set_shadow_pte(parent_pte, 0);
}
kvm_mmu_page_unlink_children(vcpu, page);
if (!page->root_count) {
hlist_del(&page->hash_link);
- kvm_mmu_free_page(vcpu, page->page_hpa);
+ kvm_mmu_free_page(vcpu, page);
} else
list_move(&page->link, &vcpu->kvm->active_mmu_pages);
}
return r;
}
+static void mmu_unshadow(struct kvm_vcpu *vcpu, gfn_t gfn)
+{
+ struct kvm_mmu_page *page;
+
+ 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);
+ }
+}
+
static void page_header_update_slot(struct kvm *kvm, void *pte, gpa_t gpa)
{
int slot = memslot_id(kvm, gfn_to_memslot(kvm, gpa >> PAGE_SHIFT));
return -ENOMEM;
}
- table[index] = new_table->page_hpa | PT_PRESENT_MASK
+ table[index] = __pa(new_table->spt) | PT_PRESENT_MASK
| PT_WRITABLE_MASK | PT_USER_MASK;
}
table_addr = table[index] & PT64_BASE_ADDR_MASK;
int i;
struct kvm_mmu_page *page;
+ if (!VALID_PAGE(vcpu->mmu.root_hpa))
+ return;
#ifdef CONFIG_X86_64
if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) {
hpa_t root = vcpu->mmu.root_hpa;
- ASSERT(VALID_PAGE(root));
page = page_header(root);
--page->root_count;
vcpu->mmu.root_hpa = INVALID_PAGE;
hpa_t root = vcpu->mmu.pae_root[i];
if (root) {
- ASSERT(VALID_PAGE(root));
root &= PT64_BASE_ADDR_MASK;
page = page_header(root);
--page->root_count;
ASSERT(!VALID_PAGE(root));
page = kvm_mmu_get_page(vcpu, root_gfn, 0,
PT64_ROOT_LEVEL, 0, 0, NULL);
- root = page->page_hpa;
+ root = __pa(page->spt);
++page->root_count;
vcpu->mmu.root_hpa = root;
return;
page = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
PT32_ROOT_LEVEL, !is_paging(vcpu),
0, NULL);
- root = page->page_hpa;
+ root = __pa(page->spt);
++page->root_count;
vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK;
}
context->free = nonpaging_free;
context->root_level = 0;
context->shadow_root_level = PT32E_ROOT_LEVEL;
- mmu_alloc_roots(vcpu);
- ASSERT(VALID_PAGE(context->root_hpa));
- kvm_arch_ops->set_cr3(vcpu, context->root_hpa);
+ context->root_hpa = INVALID_PAGE;
return 0;
}
{
pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3);
mmu_free_roots(vcpu);
- if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
- kvm_mmu_free_some_pages(vcpu);
- mmu_alloc_roots(vcpu);
- kvm_mmu_flush_tlb(vcpu);
- kvm_arch_ops->set_cr3(vcpu, vcpu->mmu.root_hpa);
-}
-
-static inline void set_pte_common(struct kvm_vcpu *vcpu,
- u64 *shadow_pte,
- gpa_t gaddr,
- int dirty,
- u64 access_bits,
- gfn_t gfn)
-{
- hpa_t paddr;
-
- *shadow_pte |= access_bits << PT_SHADOW_BITS_OFFSET;
- if (!dirty)
- access_bits &= ~PT_WRITABLE_MASK;
-
- paddr = gpa_to_hpa(vcpu, gaddr & PT64_BASE_ADDR_MASK);
-
- *shadow_pte |= access_bits;
-
- if (is_error_hpa(paddr)) {
- *shadow_pte |= gaddr;
- *shadow_pte |= PT_SHADOW_IO_MARK;
- *shadow_pte &= ~PT_PRESENT_MASK;
- return;
- }
-
- *shadow_pte |= paddr;
-
- if (access_bits & PT_WRITABLE_MASK) {
- struct kvm_mmu_page *shadow;
-
- shadow = kvm_mmu_lookup_page(vcpu, gfn);
- if (shadow) {
- pgprintk("%s: found shadow page for %lx, marking ro\n",
- __FUNCTION__, gfn);
- access_bits &= ~PT_WRITABLE_MASK;
- if (is_writeble_pte(*shadow_pte)) {
- *shadow_pte &= ~PT_WRITABLE_MASK;
- kvm_arch_ops->tlb_flush(vcpu);
- }
- }
- }
-
- if (access_bits & PT_WRITABLE_MASK)
- mark_page_dirty(vcpu->kvm, gaddr >> PAGE_SHIFT);
-
- page_header_update_slot(vcpu->kvm, shadow_pte, gaddr);
- rmap_add(vcpu, shadow_pte);
}
static void inject_page_fault(struct kvm_vcpu *vcpu,
kvm_arch_ops->inject_page_fault(vcpu, addr, err_code);
}
-static inline int fix_read_pf(u64 *shadow_ent)
-{
- if ((*shadow_ent & PT_SHADOW_USER_MASK) &&
- !(*shadow_ent & PT_USER_MASK)) {
- /*
- * If supervisor write protect is disabled, we shadow kernel
- * pages as user pages so we can trap the write access.
- */
- *shadow_ent |= PT_USER_MASK;
- *shadow_ent &= ~PT_WRITABLE_MASK;
-
- return 1;
-
- }
- return 0;
-}
-
static void paging_free(struct kvm_vcpu *vcpu)
{
nonpaging_free(vcpu);
context->free = paging_free;
context->root_level = level;
context->shadow_root_level = level;
- mmu_alloc_roots(vcpu);
- ASSERT(VALID_PAGE(context->root_hpa));
- kvm_arch_ops->set_cr3(vcpu, context->root_hpa |
- (vcpu->cr3 & (CR3_PCD_MASK | CR3_WPT_MASK)));
+ context->root_hpa = INVALID_PAGE;
return 0;
}
context->free = paging_free;
context->root_level = PT32_ROOT_LEVEL;
context->shadow_root_level = PT32E_ROOT_LEVEL;
- mmu_alloc_roots(vcpu);
- ASSERT(VALID_PAGE(context->root_hpa));
- kvm_arch_ops->set_cr3(vcpu, context->root_hpa |
- (vcpu->cr3 & (CR3_PCD_MASK | CR3_WPT_MASK)));
+ context->root_hpa = INVALID_PAGE;
return 0;
}
}
int kvm_mmu_reset_context(struct kvm_vcpu *vcpu)
+{
+ destroy_kvm_mmu(vcpu);
+ return init_kvm_mmu(vcpu);
+}
+
+int kvm_mmu_load(struct kvm_vcpu *vcpu)
{
int r;
- destroy_kvm_mmu(vcpu);
- r = init_kvm_mmu(vcpu);
- if (r < 0)
- goto out;
+ spin_lock(&vcpu->kvm->lock);
r = mmu_topup_memory_caches(vcpu);
+ if (r)
+ goto out;
+ mmu_alloc_roots(vcpu);
+ kvm_arch_ops->set_cr3(vcpu, vcpu->mmu.root_hpa);
+ kvm_mmu_flush_tlb(vcpu);
out:
+ spin_unlock(&vcpu->kvm->lock);
return r;
}
+EXPORT_SYMBOL_GPL(kvm_mmu_load);
+
+void kvm_mmu_unload(struct kvm_vcpu *vcpu)
+{
+ mmu_free_roots(vcpu);
+}
static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *page,
}
}
*spte = 0;
+ kvm_flush_remote_tlbs(vcpu->kvm);
+}
+
+static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *page,
+ u64 *spte,
+ const void *new, int bytes)
+{
+ if (page->role.level != PT_PAGE_TABLE_LEVEL)
+ return;
+
+ if (page->role.glevels == PT32_ROOT_LEVEL)
+ paging32_update_pte(vcpu, page, spte, new, bytes);
+ else
+ paging64_update_pte(vcpu, page, spte, new, bytes);
}
void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
if (quadrant != page->role.quadrant)
continue;
}
- spte = __va(page->page_hpa);
- spte += page_offset / sizeof(*spte);
+ spte = &page->spt[page_offset / sizeof(*spte)];
while (npte--) {
mmu_pte_write_zap_pte(vcpu, page, spte);
+ mmu_pte_write_new_pte(vcpu, page, spte, new, bytes);
++spte;
}
}
struct kvm_mmu_page, link);
kvm_mmu_zap_page(vcpu, page);
}
- while (!list_empty(&vcpu->free_pages)) {
- page = list_entry(vcpu->free_pages.next,
- struct kvm_mmu_page, link);
- list_del(&page->link);
- __free_page(pfn_to_page(page->page_hpa >> PAGE_SHIFT));
- page->page_hpa = INVALID_PAGE;
- }
free_page((unsigned long)vcpu->mmu.pae_root);
}
ASSERT(vcpu);
- for (i = 0; i < KVM_NUM_MMU_PAGES; i++) {
- struct kvm_mmu_page *page_header = &vcpu->page_header_buf[i];
-
- INIT_LIST_HEAD(&page_header->link);
- if ((page = alloc_page(GFP_KERNEL)) == NULL)
- goto error_1;
- set_page_private(page, (unsigned long)page_header);
- page_header->page_hpa = (hpa_t)page_to_pfn(page) << PAGE_SHIFT;
- memset(__va(page_header->page_hpa), 0, PAGE_SIZE);
- list_add(&page_header->link, &vcpu->free_pages);
- ++vcpu->kvm->n_free_mmu_pages;
- }
+ vcpu->kvm->n_free_mmu_pages = KVM_NUM_MMU_PAGES;
/*
* When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
{
ASSERT(vcpu);
ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa));
- ASSERT(list_empty(&vcpu->free_pages));
return alloc_mmu_pages(vcpu);
}
{
ASSERT(vcpu);
ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa));
- ASSERT(!list_empty(&vcpu->free_pages));
return init_kvm_mmu(vcpu);
}
if (!test_bit(slot, &page->slot_bitmap))
continue;
- pt = __va(page->page_hpa);
+ pt = page->spt;
for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
/* avoid RMW */
if (pt[i] & PT_WRITABLE_MASK) {
}
mmu_free_memory_caches(vcpu);
- kvm_arch_ops->tlb_flush(vcpu);
+ kvm_flush_remote_tlbs(vcpu->kvm);
init_kvm_mmu(vcpu);
}
kmem_cache_destroy(pte_chain_cache);
if (rmap_desc_cache)
kmem_cache_destroy(rmap_desc_cache);
+ if (mmu_page_cache)
+ kmem_cache_destroy(mmu_page_cache);
+ if (mmu_page_header_cache)
+ kmem_cache_destroy(mmu_page_header_cache);
}
int kvm_mmu_module_init(void)
if (!rmap_desc_cache)
goto nomem;
+ mmu_page_cache = kmem_cache_create("kvm_mmu_page",
+ PAGE_SIZE,
+ PAGE_SIZE, 0, NULL, NULL);
+ if (!mmu_page_cache)
+ goto nomem;
+
+ mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header",
+ sizeof(struct kvm_mmu_page),
+ 0, 0, NULL, NULL);
+ if (!mmu_page_header_cache)
+ goto nomem;
+
return 0;
nomem:
int i;
list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) {
- u64 *pt = __va(page->page_hpa);
+ u64 *pt = page->spt;
if (page->role.level != PT_PAGE_TABLE_LEVEL)
continue;
projects / powerpc.git / blobdiff