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Commit 6539e738 authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

KVM: MMU: Implement nested gva_to_gpa functions 



This patch adds the functions to do a nested l2_gva to
l1_gpa page table walk.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 14dfe855

arch/x86/include/asm/kvm_host.h

+10 −0
Original line number Diff line number Diff line
@@ -295,6 +295,16 @@ struct kvm_vcpu_arch { 
	 */

	struct kvm_mmu mmu;



	/*

	 * Paging state of an L2 guest (used for nested npt)

	 *

	 * This context will save all necessary information to walk page tables

	 * of the an L2 guest. This context is only initialized for page table

	 * walking and not for faulting since we never handle l2 page faults on

	 * the host.

	 */

	struct kvm_mmu nested_mmu;



	/*

	 * Pointer to the mmu context currently used for

	 * gva_to_gpa translations.

arch/x86/kvm/mmu.c

+8 −0
Original line number Diff line number Diff line
@@ -2466,6 +2466,14 @@ static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr, 
	return vaddr;

}



static gpa_t nonpaging_gva_to_gpa_nested(struct kvm_vcpu *vcpu, gva_t vaddr,

					 u32 access, u32 *error)

{

	if (error)

		*error = 0;

	return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access);

}



static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,

				u32 error_code)

{

arch/x86/kvm/paging_tmpl.h

+31 −0
Original line number Diff line number Diff line
@@ -276,6 +276,16 @@ static int FNAME(walk_addr)(struct guest_walker *walker, 
					write_fault, user_fault, fetch_fault);

}



static int FNAME(walk_addr_nested)(struct guest_walker *walker,

				   struct kvm_vcpu *vcpu, gva_t addr,

				   int write_fault, int user_fault,

				   int fetch_fault)

{

	return FNAME(walk_addr_generic)(walker, vcpu, &vcpu->arch.nested_mmu,

					addr, write_fault, user_fault,

					fetch_fault);

}



static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,

			      u64 *spte, const void *pte)

{
@@ -660,6 +670,27 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr, u32 access, 
	return gpa;

}



static gpa_t FNAME(gva_to_gpa_nested)(struct kvm_vcpu *vcpu, gva_t vaddr,

				      u32 access, u32 *error)

{

	struct guest_walker walker;

	gpa_t gpa = UNMAPPED_GVA;

	int r;



	r = FNAME(walk_addr_nested)(&walker, vcpu, vaddr,

				    access & PFERR_WRITE_MASK,

				    access & PFERR_USER_MASK,

				    access & PFERR_FETCH_MASK);



	if (r) {

		gpa = gfn_to_gpa(walker.gfn);

		gpa |= vaddr & ~PAGE_MASK;

	} else if (error)

		*error = walker.error_code;



	return gpa;

}



static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu,

				 struct kvm_mmu_page *sp)

{

arch/x86/kvm/x86.h

+5 −0
Original line number Diff line number Diff line
@@ -50,6 +50,11 @@ static inline int is_long_mode(struct kvm_vcpu *vcpu) 
#endif

}



static inline bool mmu_is_nested(struct kvm_vcpu *vcpu)

{

	return vcpu->arch.walk_mmu == &vcpu->arch.nested_mmu;

}



static inline int is_pae(struct kvm_vcpu *vcpu)

{

	return kvm_read_cr4_bits(vcpu, X86_CR4_PAE);