This is a note to let you know that I've just added the patch titled
KVM: emulator: emulate SALC
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-emulator-emulate-salc.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 326f578f7e1443bac2333712dd130a261ec15288 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <[email protected]>
Date: Thu, 9 May 2013 11:32:51 +0200
Subject: KVM: emulator: emulate SALC
From: Paolo Bonzini <[email protected]>
commit 326f578f7e1443bac2333712dd130a261ec15288 upstream.
This is an almost-undocumented instruction available in 32-bit mode.
I say "almost" undocumented because AMD documents it in their opcode
maps just to say that it is unavailable in 64-bit mode (sections
"A.2.1 One-Byte Opcodes" and "B.3 Invalid and Reassigned Instructions
in 64-Bit Mode").
It is roughly equivalent to "sbb %al, %al" except it does not
set the flags. Use fastop to emulate it, but do not use the opcode
directly because it would fail if the host is 64-bit!
Reported-by: Jun'ichi Nomura <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Signed-off-by: Gleb Natapov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kvm/emulate.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -534,6 +534,9 @@ FOP_SETCC(setle)
FOP_SETCC(setnle)
FOP_END;
+FOP_START(salc) "pushf; sbb %al, %al; popf \n\t" FOP_RET
+FOP_END;
+
#define __emulate_1op_rax_rdx(ctxt, _op, _suffix, _ex) \
do { \
unsigned long _tmp; \
@@ -3951,7 +3954,8 @@ static const struct opcode opcode_table[
G(Src2One | ByteOp, group2), G(Src2One, group2),
G(Src2CL | ByteOp, group2), G(Src2CL, group2),
I(DstAcc | SrcImmUByte | No64, em_aam),
- I(DstAcc | SrcImmUByte | No64, em_aad), N,
+ I(DstAcc | SrcImmUByte | No64, em_aad),
+ F(DstAcc | ByteOp | No64, em_salc),
I(DstAcc | SrcXLat | ByteOp, em_mov),
/* 0xD8 - 0xDF */
N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N,
Patches currently in stable-queue which might be from [email protected] are
queue-3.9/kvm-emulator-emulate-salc.patch
queue-3.9/kvm-emulator-emulate-aam.patch
queue-3.9/kvm-vmx-fix-halt-emulation-while-emulating-invalid-guest-sate.patch
queue-3.9/kvm-emulator-emulate-xlat.patch
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