[PATCH 11/22] KVM: MMU: Add infrastructure for two-level page walker
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From: Joerg Roedel on 27 Apr 2010 06:50 This patch introduces a mmu-callback to translate gpa addresses in the walk_addr code. This is later used to translate l2_gpa addresses into l1_gpa addresses. Signed-off-by: Joerg Roedel <joerg.roedel(a)amd.com> --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/mmu.c | 7 +++++++ arch/x86/kvm/paging_tmpl.h | 1 + include/linux/kvm_host.h | 5 +++++ 4 files changed, 14 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index f1d46e6..ccdbd2f 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -242,6 +242,7 @@ struct kvm_mmu { void (*free)(struct kvm_vcpu *vcpu); gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access, u32 *error); + gpa_t (*translate_gpa)(struct kvm_vcpu *vcpu, gpa_t gpa, u32 *error); void (*prefetch_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page); int (*sync_page)(struct kvm_vcpu *vcpu, diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 615c78f..4e0bfdb 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2131,6 +2131,11 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) spin_unlock(&vcpu->kvm->mmu_lock); } +static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 *error) +{ + return gpa; +} + static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr, u32 access, u32 *error) { @@ -2387,6 +2392,7 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) context->new_cr3 = nonpaging_new_cr3; context->page_fault = tdp_page_fault; context->free = nonpaging_free; + context->translate_gpa = translate_gpa; context->prefetch_page = nonpaging_prefetch_page; context->sync_page = nonpaging_sync_page; context->invlpg = nonpaging_invlpg; @@ -2434,6 +2440,7 @@ int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context) vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu); vcpu->arch.mmu.direct_map = false; + vcpu->arch.mmu.translate_gpa = translate_gpa; return r; } diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index b1086fe..101849a 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -122,6 +122,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, unsigned index, pt_access, pte_access; gpa_t pte_gpa; int rsvd_fault = 0; + u32 error; trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault, fetch_fault); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ce027d5..70025d1 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -520,6 +520,11 @@ static inline gpa_t gfn_to_gpa(gfn_t gfn) return (gpa_t)gfn << PAGE_SHIFT; } +static inline gfn_t gpa_to_gfn(gpa_t gpa) +{ + return (gfn_t)gpa >> PAGE_SHIFT; +} + static inline hpa_t pfn_to_hpa(pfn_t pfn) { return (hpa_t)pfn << PAGE_SHIFT; -- 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/ |