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KVM: X86: Introduce pointer to mmu context used for gva_to_gpa

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This patch introduces the walk_mmu pointer which points to
the mmu-context currently used for gva_to_gpa translations.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2010-09-10 17:30:49 +02:00 committed by Avi Kivity
parent c30a358d33
commit 14dfe855f9
3 changed files with 28 additions and 12 deletions
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13
arch/x86/include/asm/kvm_host.h
View File

@ -286,8 +286,21 @@ struct kvm_vcpu_arch {
u64 ia32_misc_enable_msr;
bool tpr_access_reporting;
/*
* Paging state of the vcpu
*
* If the vcpu runs in guest mode with two level paging this still saves
* the paging mode of the l1 guest. This context is always used to
* handle faults.
*/
struct kvm_mmu mmu;
/*
* Pointer to the mmu context currently used for
* gva_to_gpa translations.
*/
struct kvm_mmu *walk_mmu;
/*
* This struct is filled with the necessary information to propagate a
* page fault into the guest

10
arch/x86/kvm/mmu.c
View File

@ -2708,7 +2708,7 @@ static int paging32E_init_context(struct kvm_vcpu *vcpu,
static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
{
struct kvm_mmu *context = &vcpu->arch.mmu;
struct kvm_mmu *context = vcpu->arch.walk_mmu;
context->new_cr3 = nonpaging_new_cr3;
context->page_fault = tdp_page_fault;
@ -2767,11 +2767,11 @@ EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu);
static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
{
int r = kvm_init_shadow_mmu(vcpu, &vcpu->arch.mmu);
int r = kvm_init_shadow_mmu(vcpu, vcpu->arch.walk_mmu);
vcpu->arch.mmu.set_cr3 = kvm_x86_ops->set_cr3;
vcpu->arch.mmu.get_cr3 = get_cr3;
vcpu->arch.mmu.inject_page_fault = kvm_inject_page_fault;
vcpu->arch.walk_mmu->set_cr3 = kvm_x86_ops->set_cr3;
vcpu->arch.walk_mmu->get_cr3 = get_cr3;
vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault;
return r;
}

17
arch/x86/kvm/x86.c
View File

@ -3456,27 +3456,27 @@ static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, error);
}
gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_FETCH_MASK;
return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, error);
}
gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_WRITE_MASK;
return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, access, error);
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, error);
}
/* uses this to access any guest's mapped memory without checking CPL */
gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
{
return vcpu->arch.mmu.gva_to_gpa(vcpu, gva, 0, error);
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, error);
}
static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
@ -3487,7 +3487,8 @@ static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
int r = X86EMUL_CONTINUE;
while (bytes) {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr, access, error);
gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
error);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
@ -3542,8 +3543,9 @@ static int kvm_write_guest_virt_system(gva_t addr, void *val,
int r = X86EMUL_CONTINUE;
while (bytes) {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr,
PFERR_WRITE_MASK, error);
gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
PFERR_WRITE_MASK,
error);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
@ -5663,6 +5665,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
kvm = vcpu->kvm;
vcpu->arch.emulate_ctxt.ops = &emulate_ops;
vcpu->arch.walk_mmu = &vcpu->arch.mmu;
vcpu->arch.mmu.root_hpa = INVALID_PAGE;
vcpu->arch.mmu.translate_gpa = translate_gpa;
if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))