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KVM: emulator: fix error code for __linearize 

The error code for #GP and #SS is zero when the segment is used to
access an operand or an instruction.  It is only non-zero when
a segment register is being loaded; for limit checks this means
cases such as:

* for #GP, when RIP is beyond the limit on a far call (before the first
instruction is executed).  We do not implement this check, but it
would be in em_jmp_far/em_call_far.

* for #SS, if the new stack overflows during an inter-privilege-level
call to a non-conforming code segment.  We do not implement stack
switching at all.

So use an error code of zero.

Reviewed-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-10-27 14:40:49 +01:00
parent cac7f24298
commit 3606189fa3
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/emulate.c
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@ -711,9 +711,9 @@ static int __linearize(struct x86_emulate_ctxt *ctxt,
return X86EMUL_CONTINUE;
bad:
if (addr.seg == VCPU_SREG_SS)
return emulate_ss(ctxt, sel);
return emulate_ss(ctxt, 0);
else
return emulate_gp(ctxt, sel);
return emulate_gp(ctxt, 0);
}
static int linearize(struct x86_emulate_ctxt *ctxt,