[PATCH 19/22] KVM: MMU: Introduce init_kvm_nested_mmu()
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From: Joerg Roedel on 27 Apr 2010 06:50 This patch introduces the init_kvm_nested_mmu() function which is used to re-initialize the nested mmu when the l2 guest changes its paging mode. Signed-off-by: Joerg Roedel <joerg.roedel(a)amd.com> --- arch/x86/kvm/mmu.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 54 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 8bd40b5..af89e71 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2136,6 +2136,25 @@ static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 *error) return gpa; } +static gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 *error) +{ + gpa_t t_gpa; + u32 access; + u32 err; + + BUG_ON(!vcpu->arch.mmu.nested); + + /* NPT walks are treated as user writes */ + access = PFERR_WRITE_MASK | PFERR_USER_MASK; + t_gpa = vcpu->arch.nested_mmu.gva_to_gpa(vcpu, gpa, access, &err); + if (t_gpa == UNMAPPED_GVA) { + vcpu->arch.fault_address = gpa; + vcpu->arch.fault_error_code = err | PFERR_NESTED_MASK; + } + + return t_gpa; +} + static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr, u32 access, u32 *error) { @@ -2465,11 +2484,45 @@ static int init_kvm_softmmu(struct kvm_vcpu *vcpu) return r; } +static int init_kvm_nested_mmu(struct kvm_vcpu *vcpu) +{ + struct kvm_mmu *g_context = &vcpu->arch.nested_mmu; + struct kvm_mmu *h_context = &vcpu->arch.mmu; + + g_context->get_cr3 = get_cr3; + g_context->translate_gpa = translate_nested_gpa; + g_context->inject_page_fault = kvm_inject_page_fault; + + /* + * Note that arch.mmu.gva_to_gpa translates l2_gva to l1_gpa. The + * translation of l2_gpa to l1_gpa addresses is done using the + * arch.nested_mmu.gva_to_gpa function. Basically the gva_to_gpa + * functions between mmu and nested_mmu are swapped. + */ + if (!is_paging(vcpu)) { + g_context->root_level = 0; + h_context->gva_to_gpa = nonpaging_gva_to_gpa_nested; + } else if (is_long_mode(vcpu)) { + g_context->root_level = PT64_ROOT_LEVEL; + h_context->gva_to_gpa = paging64_gva_to_gpa_nested; + } else if (is_pae(vcpu)) { + g_context->root_level = PT32E_ROOT_LEVEL; + h_context->gva_to_gpa = paging64_gva_to_gpa_nested; + } else { + g_context->root_level = PT32_ROOT_LEVEL; + h_context->gva_to_gpa = paging32_gva_to_gpa_nested; + } + + return 0; +} + static int init_kvm_mmu(struct kvm_vcpu *vcpu) { vcpu->arch.update_pte.pfn = bad_pfn; - if (tdp_enabled) + if (vcpu->arch.mmu.nested) + return init_kvm_nested_mmu(vcpu); + else if (tdp_enabled) return init_kvm_tdp_mmu(vcpu); else return init_kvm_softmmu(vcpu); -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |