On 04/27/2010 03:15 PM, Gleb Natapov wrote:
Use callbacks from x86_emulate_ops to access segments instead of calling
into kvm directly.
-static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg)
+static unsigned long seg_base(struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops *ops, int seg)
{
- if (ctxt->mode == X86EMUL_MODE_PROT64&& seg< VCPU_SREG_FS)
- return 0;
+ unsigned long base;
- return kvm_x86_ops->get_segment_base(ctxt->vcpu, seg);
get_segment_base() is only one vmread on intel, but you replace it with
reading the entire segment.
+ if (ctxt->mode == X86EMUL_MODE_PROT64) {
+ u64 val;
+ switch (seg) {
+ case VCPU_SREG_FS:
+ ops->get_msr(ctxt->vcpu, MSR_FS_BASE,&val);
+ break;
+ case VCPU_SREG_GS:
+ ops->get_msr(ctxt->vcpu, MSR_GS_BASE,&val);
+ break;
+ default:
+ val = 0;
+ break;
+ }
Why this ugliness? get_cached_descriptor() should do this.
static unsigned long seg_override_base(struct x86_emulate_ctxt *ctxt,
+ struct x86_emulate_ops *ops,
struct decode_cache *c)
{
if (!c->has_seg_override)
return 0;
- return seg_base(ctxt, c->seg_override);
+ return seg_base(ctxt, ops, c->seg_override);
}
Sticking ops into ctxt would reduce the size of these patches.
--
error compiling committee.c: too many arguments to function
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