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KVM: x86: save one bit in ctxt->d

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Alignments are exclusive, so 5 modes can be expressed in 3 bits.

Signed-off-by: Radim Krčmář <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Radim Krčmář 2016-11-08 20:54:17 +01:00
commit 4852018789
1 changed files with 13 additions and 10 deletions
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23
arch/x86/kvm/emulate.c
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@ -158,9 +158,11 @@
#define Src2GS (OpGS << Src2Shift)
#define Src2Mask (OpMask << Src2Shift)
#define Mmx ((u64)1 << 40) /* MMX Vector instruction */
#define AlignMask ((u64)7 << 41)
#define Aligned ((u64)1 << 41) /* Explicitly aligned (e.g. MOVDQA) */
#define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */
#define Avx ((u64)1 << 43) /* Advanced Vector Extensions */
#define Unaligned ((u64)2 << 41) /* Explicitly unaligned (e.g. MOVDQU) */
#define Avx ((u64)3 << 41) /* Advanced Vector Extensions */
#define Aligned16 ((u64)4 << 41) /* Aligned to 16 byte boundary (e.g. FXSAVE) */
#define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */
#define NoWrite ((u64)1 << 45) /* No writeback */
#define SrcWrite ((u64)1 << 46) /* Write back src operand */
@ -171,7 +173,6 @@
#define NearBranch ((u64)1 << 52) /* Near branches */
#define No16 ((u64)1 << 53) /* No 16 bit operand */
#define IncSP ((u64)1 << 54) /* SP is incremented before ModRM calc */
#define Aligned16 ((u64)1 << 55) /* Aligned to 16 byte boundary (e.g. FXSAVE) */
#define DstXacc (DstAccLo | SrcAccHi | SrcWrite)
@ -638,19 +639,21 @@ static void set_segment_selector(struct x86_emulate_ctxt *ctxt, u16 selector,
*/
static unsigned insn_alignment(struct x86_emulate_ctxt *ctxt, unsigned size)
{
u64 alignment = ctxt->d & AlignMask;
if (likely(size < 16))
return 1;
if (ctxt->d & Aligned)
return size;
else if (ctxt->d & Unaligned)
switch (alignment) {
case Unaligned:
case Avx:
return 1;
else if (ctxt->d & Avx)
return 1;
else if (ctxt->d & Aligned16)
case Aligned16:
return 16;
else
case Aligned:
default:
return size;
}
}
static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,