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| author | Joerg Roedel <joerg.roedel@amd.com> | 2012-05-07 12:12:25 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-05-14 11:32:38 +0300 |
| commit | d54e4237bcbb400fda11c902fd538aa0b4805720 (patch) | |
| tree | f2b89d6c56fc585fa4b0edacb109889f1ed64d9f /arch/x86 | |
| parent | 5f3fbc342f408199e5cbb4b3dc220569147a99a7 (diff) | |
| download | linux-stable-d54e4237bcbb400fda11c902fd538aa0b4805720.tar.gz linux-stable-d54e4237bcbb400fda11c902fd538aa0b4805720.tar.bz2 linux-stable-d54e4237bcbb400fda11c902fd538aa0b4805720.zip | |
KVM: x86 emulator: convert bsf/bsr instructions to emulate_2op_SrcV_nobyte()
The instruction emulation for bsrw is broken in KVM because
the code always uses bsr with 32 or 64 bit operand size for
emulation. Fix that by using emulate_2op_SrcV_nobyte() macro
to use guest operand size for emulation.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 26 |
1 files changed, 2 insertions, 24 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 7fd25763b0e0..f95d242ee9f7 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3133,35 +3133,13 @@ static int em_btc(struct x86_emulate_ctxt *ctxt) static int em_bsf(struct x86_emulate_ctxt *ctxt) { - u8 zf; - - __asm__ ("bsf %2, %0; setz %1" - : "=r"(ctxt->dst.val), "=q"(zf) - : "r"(ctxt->src.val)); - - ctxt->eflags &= ~X86_EFLAGS_ZF; - if (zf) { - ctxt->eflags |= X86_EFLAGS_ZF; - /* Disable writeback. */ - ctxt->dst.type = OP_NONE; - } + emulate_2op_SrcV_nobyte(ctxt, "bsf"); return X86EMUL_CONTINUE; } static int em_bsr(struct x86_emulate_ctxt *ctxt) { - u8 zf; - - __asm__ ("bsr %2, %0; setz %1" - : "=r"(ctxt->dst.val), "=q"(zf) - : "r"(ctxt->src.val)); - - ctxt->eflags &= ~X86_EFLAGS_ZF; - if (zf) { - ctxt->eflags |= X86_EFLAGS_ZF; - /* Disable writeback. */ - ctxt->dst.type = OP_NONE; - } + emulate_2op_SrcV_nobyte(ctxt, "bsr"); return X86EMUL_CONTINUE; } |