forked from mirrors/linux
[PATCH] KVM: MU: Special treatment for shadow pae root pages
Since we're not going to cache the pae-mode shadow root pages, allocate a single pae shadow that will hold the four lower-level pages, which will act as roots. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Avi Kivity
Linus Torvalds
parent
ac79c978f1
commit
17ac10ad2b
2 changed files with 82 additions and 45 deletions
|
|
@ -123,6 +123,8 @@ struct kvm_mmu {
|
|||
hpa_t root_hpa;
|
||||
int root_level;
|
||||
int shadow_root_level;
|
||||
|
||||
u64 *pae_root;
|
||||
};
|
||||
|
||||
struct kvm_guest_debug {
|
||||
|
|
@ -548,19 +550,4 @@ static inline u32 get_rdx_init_val(void)
|
|||
#define TSS_REDIRECTION_SIZE (256 / 8)
|
||||
#define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
|
||||
/*
|
||||
* When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. Therefore
|
||||
* we need to allocate shadow page tables in the first 4GB of memory, which
|
||||
* happens to fit the DMA32 zone.
|
||||
*/
|
||||
#define GFP_KVM_MMU (GFP_KERNEL | __GFP_DMA32)
|
||||
|
||||
#else
|
||||
|
||||
#define GFP_KVM_MMU GFP_KERNEL
|
||||
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -420,19 +420,63 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p)
|
|||
}
|
||||
}
|
||||
|
||||
static void mmu_free_roots(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
int i;
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) {
|
||||
hpa_t root = vcpu->mmu.root_hpa;
|
||||
|
||||
ASSERT(VALID_PAGE(root));
|
||||
release_pt_page_64(vcpu, root, PT64_ROOT_LEVEL);
|
||||
vcpu->mmu.root_hpa = INVALID_PAGE;
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
for (i = 0; i < 4; ++i) {
|
||||
hpa_t root = vcpu->mmu.pae_root[i];
|
||||
|
||||
ASSERT(VALID_PAGE(root));
|
||||
root &= PT64_BASE_ADDR_MASK;
|
||||
release_pt_page_64(vcpu, root, PT32E_ROOT_LEVEL - 1);
|
||||
vcpu->mmu.pae_root[i] = INVALID_PAGE;
|
||||
}
|
||||
vcpu->mmu.root_hpa = INVALID_PAGE;
|
||||
}
|
||||
|
||||
static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
int i;
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) {
|
||||
hpa_t root = vcpu->mmu.root_hpa;
|
||||
|
||||
ASSERT(!VALID_PAGE(root));
|
||||
root = kvm_mmu_alloc_page(vcpu, NULL);
|
||||
vcpu->mmu.root_hpa = root;
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
for (i = 0; i < 4; ++i) {
|
||||
hpa_t root = vcpu->mmu.pae_root[i];
|
||||
|
||||
ASSERT(!VALID_PAGE(root));
|
||||
root = kvm_mmu_alloc_page(vcpu, NULL);
|
||||
vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK;
|
||||
}
|
||||
vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root);
|
||||
}
|
||||
|
||||
static void nonpaging_flush(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
hpa_t root = vcpu->mmu.root_hpa;
|
||||
|
||||
++kvm_stat.tlb_flush;
|
||||
pgprintk("nonpaging_flush\n");
|
||||
ASSERT(VALID_PAGE(root));
|
||||
release_pt_page_64(vcpu, root, vcpu->mmu.shadow_root_level);
|
||||
root = kvm_mmu_alloc_page(vcpu, NULL);
|
||||
ASSERT(VALID_PAGE(root));
|
||||
vcpu->mmu.root_hpa = root;
|
||||
if (is_paging(vcpu))
|
||||
root |= (vcpu->cr3 & (CR3_PCD_MASK | CR3_WPT_MASK));
|
||||
mmu_free_roots(vcpu);
|
||||
mmu_alloc_roots(vcpu);
|
||||
kvm_arch_ops->set_cr3(vcpu, root);
|
||||
kvm_arch_ops->tlb_flush(vcpu);
|
||||
}
|
||||
|
|
@ -475,13 +519,7 @@ static void nonpaging_inval_page(struct kvm_vcpu *vcpu, gva_t addr)
|
|||
|
||||
static void nonpaging_free(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
hpa_t root;
|
||||
|
||||
ASSERT(vcpu);
|
||||
root = vcpu->mmu.root_hpa;
|
||||
if (VALID_PAGE(root))
|
||||
release_pt_page_64(vcpu, root, vcpu->mmu.shadow_root_level);
|
||||
vcpu->mmu.root_hpa = INVALID_PAGE;
|
||||
mmu_free_roots(vcpu);
|
||||
}
|
||||
|
||||
static int nonpaging_init_context(struct kvm_vcpu *vcpu)
|
||||
|
|
@ -495,7 +533,7 @@ static int nonpaging_init_context(struct kvm_vcpu *vcpu)
|
|||
context->free = nonpaging_free;
|
||||
context->root_level = PT32E_ROOT_LEVEL;
|
||||
context->shadow_root_level = PT32E_ROOT_LEVEL;
|
||||
context->root_hpa = kvm_mmu_alloc_page(vcpu, NULL);
|
||||
mmu_alloc_roots(vcpu);
|
||||
ASSERT(VALID_PAGE(context->root_hpa));
|
||||
kvm_arch_ops->set_cr3(vcpu, context->root_hpa);
|
||||
return 0;
|
||||
|
|
@ -647,7 +685,7 @@ static void paging_free(struct kvm_vcpu *vcpu)
|
|||
#include "paging_tmpl.h"
|
||||
#undef PTTYPE
|
||||
|
||||
static int paging64_init_context(struct kvm_vcpu *vcpu)
|
||||
static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
|
||||
{
|
||||
struct kvm_mmu *context = &vcpu->mmu;
|
||||
|
||||
|
|
@ -657,15 +695,20 @@ static int paging64_init_context(struct kvm_vcpu *vcpu)
|
|||
context->inval_page = paging_inval_page;
|
||||
context->gva_to_gpa = paging64_gva_to_gpa;
|
||||
context->free = paging_free;
|
||||
context->root_level = PT64_ROOT_LEVEL;
|
||||
context->shadow_root_level = PT64_ROOT_LEVEL;
|
||||
context->root_hpa = kvm_mmu_alloc_page(vcpu, NULL);
|
||||
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)));
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int paging64_init_context(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL);
|
||||
}
|
||||
|
||||
static int paging32_init_context(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
struct kvm_mmu *context = &vcpu->mmu;
|
||||
|
|
@ -677,7 +720,7 @@ static int paging32_init_context(struct kvm_vcpu *vcpu)
|
|||
context->free = paging_free;
|
||||
context->root_level = PT32_ROOT_LEVEL;
|
||||
context->shadow_root_level = PT32E_ROOT_LEVEL;
|
||||
context->root_hpa = kvm_mmu_alloc_page(vcpu, NULL);
|
||||
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)));
|
||||
|
|
@ -686,14 +729,7 @@ static int paging32_init_context(struct kvm_vcpu *vcpu)
|
|||
|
||||
static int paging32E_init_context(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if ((ret = paging64_init_context(vcpu)))
|
||||
return ret;
|
||||
|
||||
vcpu->mmu.root_level = PT32E_ROOT_LEVEL;
|
||||
vcpu->mmu.shadow_root_level = PT32E_ROOT_LEVEL;
|
||||
return 0;
|
||||
return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL);
|
||||
}
|
||||
|
||||
static int init_kvm_mmu(struct kvm_vcpu *vcpu)
|
||||
|
|
@ -737,26 +773,40 @@ static void free_mmu_pages(struct kvm_vcpu *vcpu)
|
|||
__free_page(pfn_to_page(page->page_hpa >> PAGE_SHIFT));
|
||||
page->page_hpa = INVALID_PAGE;
|
||||
}
|
||||
free_page((unsigned long)vcpu->mmu.pae_root);
|
||||
}
|
||||
|
||||
static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
struct page *page;
|
||||
int i;
|
||||
|
||||
ASSERT(vcpu);
|
||||
|
||||
for (i = 0; i < KVM_NUM_MMU_PAGES; i++) {
|
||||
struct page *page;
|
||||
struct kvm_mmu_page *page_header = &vcpu->page_header_buf[i];
|
||||
|
||||
INIT_LIST_HEAD(&page_header->link);
|
||||
if ((page = alloc_page(GFP_KVM_MMU)) == NULL)
|
||||
if ((page = alloc_page(GFP_KERNEL)) == NULL)
|
||||
goto error_1;
|
||||
page->private = (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);
|
||||
}
|
||||
|
||||
/*
|
||||
* When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
|
||||
* Therefore we need to allocate shadow page tables in the first
|
||||
* 4GB of memory, which happens to fit the DMA32 zone.
|
||||
*/
|
||||
page = alloc_page(GFP_KERNEL | __GFP_DMA32);
|
||||
if (!page)
|
||||
goto error_1;
|
||||
vcpu->mmu.pae_root = page_address(page);
|
||||
for (i = 0; i < 4; ++i)
|
||||
vcpu->mmu.pae_root[i] = INVALID_PAGE;
|
||||
|
||||
return 0;
|
||||
|
||||
error_1:
|
||||
|
|
|
|||
Loading…
Reference in a new issue