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Commit e2cefa74 authored by Nadav Amit's avatar Nadav Amit Committed by Paolo Bonzini
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KVM: x86: Do not set access bit on accessed segments 



When segment is loaded, the segment access bit is set unconditionally.  In
fact, it should be set conditionally, based on whether the segment had the
accessed bit set before. In addition, it can improve performance.

Signed-off-by: default avatarNadav Amit <namit@cs.technion.ac.il>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent ab708099

arch/x86/kvm/emulate.c

+7 −4
Original line number Diff line number Diff line
@@ -1618,10 +1618,13 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, 


	if (seg_desc.s) {

		/* mark segment as accessed */

		if (!(seg_desc.type & 1)) {

			seg_desc.type |= 1;

		ret = write_segment_descriptor(ctxt, selector, &seg_desc);

			ret = write_segment_descriptor(ctxt, selector,

						       &seg_desc);

			if (ret != X86EMUL_CONTINUE)

				return ret;

		}

	} else if (ctxt->mode == X86EMUL_MODE_PROT64) {

		ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3,

				sizeof(base3), &ctxt->exception);