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selftests: kvm: Fix the segment descriptor layout to match the actual layout 

Fix the layout of 'struct desc64' to match the layout described in the
SDM Vol 3, Chapter 3 "Protected-Mode Memory Management", section 3.4.5
"Segment Descriptors", Figure 3-8 "Segment Descriptor".  The test added
later in this series relies on this and crashes if this layout is not
correct.

Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Reviewed-by: Alexander Graf <graf@amazon.com>
Message-Id: <20201012194716.3950330-2-aaronlewis@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis 2020-10-12 12:47:13 -07:00 committed by Paolo Bonzini
parent 2cdef91cf8
commit df11f7dd58
2 changed files with 3 additions and 2 deletions
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2
tools/testing/selftests/kvm/include/x86_64/processor.h
View File

@ -59,7 +59,7 @@ struct gpr64_regs {
struct desc64 {
uint16_t limit0;
uint16_t base0;
unsigned base1:8, s:1, type:4, dpl:2, p:1;
unsigned base1:8, type:4, s:1, dpl:2, p:1;
unsigned limit1:4, avl:1, l:1, db:1, g:1, base2:8;
uint32_t base3;
uint32_t zero1;

3
tools/testing/selftests/kvm/lib/x86_64/processor.c
View File

@ -392,11 +392,12 @@ static void kvm_seg_fill_gdt_64bit(struct kvm_vm *vm, struct kvm_segment *segp)
desc->limit0 = segp->limit & 0xFFFF;
desc->base0 = segp->base & 0xFFFF;
desc->base1 = segp->base >> 16;
desc->s = segp->s;
desc->type = segp->type;
desc->s = segp->s;
desc->dpl = segp->dpl;
desc->p = segp->present;
desc->limit1 = segp->limit >> 16;
desc->avl = segp->avl;
desc->l = segp->l;
desc->db = segp->db;
desc->g = segp->g;