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

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>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4915b7c..1b3eb8a 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -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

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9936727..cb06ada 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -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;
 }

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2364c2c..4196fc7 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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))