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KVM: x86 emulator: consolidate segment accessors

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Instead of separate accessors for the segment selector and cached descriptor,
use one accessor for both.  This simplifies the code somewhat.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity
2011-04-27 13:20:30 +03:00
parent 0a434bb2bf
commit 1aa366163b
3 changed files with 83 additions and 93 deletions
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41
arch/x86/kvm/x86.c
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@@ -4304,13 +4304,14 @@ static unsigned long emulator_get_cached_segment_base(
return get_segment_base(emul_to_vcpu(ctxt), seg);
}
static bool emulator_get_cached_descriptor(struct x86_emulate_ctxt *ctxt,
struct desc_struct *desc, u32 *base3,
int seg)
static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
struct desc_struct *desc, u32 *base3,
int seg)
{
struct kvm_segment var;
kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
*selector = var.selector;
if (var.unusable)
return false;
@@ -4335,16 +4336,14 @@ static bool emulator_get_cached_descriptor(struct x86_emulate_ctxt *ctxt,
return true;
}
static void emulator_set_cached_descriptor(struct x86_emulate_ctxt *ctxt,
struct desc_struct *desc, u32 base3,
int seg)
static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
struct desc_struct *desc, u32 base3,
int seg)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
struct kvm_segment var;
/* needed to preserve selector */
kvm_get_segment(vcpu, &var, seg);
var.selector = selector;
var.base = get_desc_base(desc);
#ifdef CONFIG_X86_64
var.base |= ((u64)base3) << 32;
@@ -4368,24 +4367,6 @@ static void emulator_set_cached_descriptor(struct x86_emulate_ctxt *ctxt,
return;
}
static u16 emulator_get_segment_selector(struct x86_emulate_ctxt *ctxt, int seg)
{
struct kvm_segment kvm_seg;
kvm_get_segment(emul_to_vcpu(ctxt), &kvm_seg, seg);
return kvm_seg.selector;
}
static void emulator_set_segment_selector(struct x86_emulate_ctxt *ctxt,
u16 sel, int seg)
{
struct kvm_segment kvm_seg;
kvm_get_segment(emul_to_vcpu(ctxt), &kvm_seg, seg);
kvm_seg.selector = sel;
kvm_set_segment(emul_to_vcpu(ctxt), &kvm_seg, seg);
}
static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 *pdata)
{
@@ -4436,10 +4417,8 @@ static struct x86_emulate_ops emulate_ops = {
.invlpg = emulator_invlpg,
.pio_in_emulated = emulator_pio_in_emulated,
.pio_out_emulated = emulator_pio_out_emulated,
.get_cached_descriptor = emulator_get_cached_descriptor,
.set_cached_descriptor = emulator_set_cached_descriptor,
.get_segment_selector = emulator_get_segment_selector,
.set_segment_selector = emulator_set_segment_selector,
.get_segment = emulator_get_segment,
.set_segment = emulator_set_segment,
.get_cached_segment_base = emulator_get_cached_segment_base,
.get_gdt = emulator_get_gdt,
.get_idt = emulator_get_idt,