Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ec92fe44 authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

KVM: X86: Add kvm_read_guest_page_mmu function 



This patch adds a function which can read from the guests
physical memory or from the guest's guest physical memory.
This will be used in the two-dimensional page table walker.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 6539e738

arch/x86/include/asm/kvm_host.h

+3 −0
Original line number Diff line number Diff line
@@ -657,6 +657,9 @@ void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code); 
void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr);

void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);

void kvm_inject_page_fault(struct kvm_vcpu *vcpu);

int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,

			    gfn_t gfn, void *data, int offset, int len,

			    u32 access);

bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);



int kvm_pic_set_irq(void *opaque, int irq, int level);

arch/x86/kvm/x86.c

+23 −0
Original line number Diff line number Diff line
@@ -369,6 +369,29 @@ bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) 
}

EXPORT_SYMBOL_GPL(kvm_require_cpl);



/*

 * This function will be used to read from the physical memory of the currently

 * running guest. The difference to kvm_read_guest_page is that this function

 * can read from guest physical or from the guest's guest physical memory.

 */

int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,

			    gfn_t ngfn, void *data, int offset, int len,

			    u32 access)

{

	gfn_t real_gfn;

	gpa_t ngpa;



	ngpa     = gfn_to_gpa(ngfn);

	real_gfn = mmu->translate_gpa(vcpu, ngpa, access);

	if (real_gfn == UNMAPPED_GVA)

		return -EFAULT;



	real_gfn = gpa_to_gfn(real_gfn);



	return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);

}

EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);



/*

 * Load the pae pdptrs.  Return true is they are all valid.

 */