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KVM: task switch: segment base is linear address 

The segment base is always a linear address, so translate before
accessing guest memory.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti 2008-07-16 19:07:10 -03:00 committed by Avi Kivity
parent 5f4cb662a0
commit 98899aa0e0
1 changed files with 9 additions and 3 deletions
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12
arch/x86/kvm/x86.c
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@ -3223,6 +3223,7 @@ static void get_segment_descritptor_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;
@ -3232,13 +3233,16 @@ static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
return 1;
}
return kvm_read_guest(vcpu->kvm, dtable.base + index * 8, seg_desc, 8);
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
gpa += index * 8;
return kvm_read_guest(vcpu->kvm, gpa, seg_desc, 8);
}
/* 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;
@ -3246,7 +3250,9 @@ static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
if (dtable.limit < index * 8 + 7)
return 1;
return kvm_write_guest(vcpu->kvm, dtable.base + index * 8, seg_desc, 8);
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
gpa += index * 8;
return kvm_write_guest(vcpu->kvm, gpa, seg_desc, 8);
}
static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
@ -3258,7 +3264,7 @@ static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
base_addr |= (seg_desc->base1 << 16);
base_addr |= (seg_desc->base2 << 24);
return base_addr;
return vcpu->arch.mmu.gva_to_gpa(vcpu, base_addr);
}
static int load_tss_segment32(struct kvm_vcpu *vcpu,