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KVM: emulate: clean up initializations in init_decode_cache 

A lot of initializations are unnecessary as they get set to
appropriate values before actually being used. Optimize
placement of fields in x86_emulate_ctxt

Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Bandan Das 2014-04-16 12:46:12 -04:00 committed by Paolo Bonzini
parent 02357bdc8c
commit c44b4c6ab8
2 changed files with 13 additions and 14 deletions
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20
arch/x86/include/asm/kvm_emulate.h
View File

@ -288,30 +288,32 @@ struct x86_emulate_ctxt {
u8 opcode_len;
u8 b;
u8 intercept;
u8 lock_prefix;
u8 rep_prefix;
u8 op_bytes;
u8 ad_bytes;
u8 rex_prefix;
struct operand src;
struct operand src2;
struct operand dst;
bool has_seg_override;
u8 seg_override;
u64 d;
int (*execute)(struct x86_emulate_ctxt *ctxt);
int (*check_perm)(struct x86_emulate_ctxt *ctxt);
bool has_seg_override;
bool rip_relative;
u8 rex_prefix;
u8 lock_prefix;
u8 rep_prefix;
u8 seg_override;
/* bitmaps of registers in _regs[] that can be read */
u32 regs_valid;
/* bitmaps of registers in _regs[] that have been written */
u32 regs_dirty;
/* modrm */
u8 modrm;
u8 modrm_mod;
u8 modrm_reg;
u8 modrm_rm;
u8 modrm_seg;
bool rip_relative;
u64 d;
unsigned long _eip;
struct operand memop;
u32 regs_valid; /* bitmaps of registers in _regs[] that can be read */
u32 regs_dirty; /* bitmaps of registers in _regs[] that have been written */
/* Fields above regs are cleared together. */
unsigned long _regs[NR_VCPU_REGS];
struct operand *memopp;

7
arch/x86/kvm/emulate.c
View File

@ -4534,14 +4534,11 @@ static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *))
void init_decode_cache(struct x86_emulate_ctxt *ctxt)
{
memset(&ctxt->opcode_len, 0,
(void *)&ctxt->_regs - (void *)&ctxt->opcode_len);
memset(&ctxt->has_seg_override, 0,
(void *)&ctxt->modrm - (void *)&ctxt->has_seg_override);
ctxt->fetch.start = 0;
ctxt->fetch.end = 0;
ctxt->io_read.pos = 0;
ctxt->io_read.end = 0;
ctxt->mem_read.pos = 0;
ctxt->mem_read.end = 0;
}