Commit c73e197b authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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KVM: x86 emulator: fix RCX access during rep emulation 



During rep emulation access length to RCX depends on current address
mode.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent d6d367d6

arch/x86/kvm/emulate.c

+2 −2
Original line number Diff line number Diff line
@@ -1852,7 +1852,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 


	if (c->rep_prefix && (c->d & String)) {

		/* All REP prefixes have the same first termination condition */

		if (c->regs[VCPU_REGS_RCX] == 0) {

		if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) {

			kvm_rip_write(ctxt->vcpu, c->eip);

			goto done;

		}
@@ -1876,7 +1876,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
				goto done;

			}

		}

		c->regs[VCPU_REGS_RCX]--;

		register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);

		c->eip = kvm_rip_read(ctxt->vcpu);

	}