diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2010-09-10 17:30:51 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-10-24 10:52:37 +0200 |
| commit | ec92fe44e7ff94d04d8305e49efcffd8773e1cf6 (patch) | |
| tree | a1f3c9e47e5c05a83d0d507d0616f810234c80a4 /arch | |
| parent | 6539e738f65a8f1fc7806295d5d701fba4008343 (diff) | |
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: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 23 |
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 8ec3547c433d..08bc383083ff 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -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); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 4196fc719142..a2efb70f4cc8 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -370,6 +370,29 @@ 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. */ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) |