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KVM: Use kvm_{read,write}_guest_virt() to read and write segment descriptors 

Segment descriptors tables can be placed on two non-contiguous pages.
This patch makes reading segment descriptors by linear address.

Signed-off-by: Mikhail Ershov <Mike.Ershov@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Mikhail Ershov 2009-08-19 14:08:07 +04:00 committed by Avi Kivity
parent 7bdb588827
commit d9048d3278
1 changed files with 2 additions and 8 deletions
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10
arch/x86/kvm/x86.c
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@ -4021,7 +4021,6 @@ static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
struct desc_struct *seg_desc)
{
gpa_t gpa;
struct descriptor_table dtable;
u16 index = selector >> 3;
@ -4031,16 +4030,13 @@ static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
return 1;
}
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
gpa += index * 8;
return kvm_read_guest(vcpu->kvm, gpa, seg_desc, 8);
return kvm_read_guest_virt(dtable.base + index*8, seg_desc, sizeof(*seg_desc), vcpu);
}
/* allowed just for 8 bytes segments */
static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
struct desc_struct *seg_desc)
{
gpa_t gpa;
struct descriptor_table dtable;
u16 index = selector >> 3;
@ -4048,9 +4044,7 @@ static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
if (dtable.limit < index * 8 + 7)
return 1;
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
gpa += index * 8;
return kvm_write_guest(vcpu->kvm, gpa, seg_desc, 8);
return kvm_write_guest_virt(dtable.base + index*8, seg_desc, sizeof(*seg_desc), vcpu);
}
static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,