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KVM: x86: Sysexit emulation does not mask RIP/RSP

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If the operand size is not 64-bit, then the sysexit instruction should assign
ECX to RSP and EDX to RIP.  The current code assigns the full 64-bits.

Fix it by masking.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-09-18 22:39:45 +03:00 committed by Paolo Bonzini
parent 58b7075d05
commit bf0b682c9b
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/emulate.c
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@ -2417,6 +2417,8 @@ static int em_sysexit(struct x86_emulate_ctxt *ctxt)
if ((msr_data & 0xfffc) == 0x0)
return emulate_gp(ctxt, 0);
ss_sel = (u16)(msr_data + 24);
rcx = (u32)rcx;
rdx = (u32)rdx;
break;
case X86EMUL_MODE_PROT64:
cs_sel = (u16)(msr_data + 32);