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KVM: x86 emulator: allow storing emulator execution function in decode tables

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Instead of looking up the opcode twice (once for decode flags, once for
the big execution switch) look up both flags and function in the decode tables.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-07-29 15:11:51 +03:00
parent 9aabc88fc8
commit ef65c88912
2 changed files with 13 additions and 0 deletions
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1
arch/x86/include/asm/kvm_emulate.h
View File

@ -190,6 +190,7 @@ struct decode_cache {
bool has_seg_override;
u8 seg_override;
unsigned int d;
int (*execute)(struct x86_emulate_ctxt *ctxt);
unsigned long regs[NR_VCPU_REGS];
unsigned long eip;
/* modrm */

12
arch/x86/kvm/emulate.c
View File

@ -106,6 +106,7 @@
struct opcode {
u32 flags;
union {
int (*execute)(struct x86_emulate_ctxt *ctxt);
struct opcode *group;
struct group_dual *gdual;
} u;
@ -120,6 +121,7 @@ struct group_dual {
#define N D(0)
#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
#define GD(_f, _g) { .flags = ((_f) | Group | GroupDual), .u.gdual = (_g) }
#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
static struct opcode group1[] = {
X7(D(Lock)), N
@ -349,6 +351,7 @@ static struct opcode twobyte_table[256] = {
#undef N
#undef G
#undef GD
#undef I
/* EFLAGS bit definitions. */
#define EFLG_ID (1<<21)
@ -1070,6 +1073,8 @@ done_prefixes:
c->d |= opcode.flags;
}
c->execute = opcode.u.execute;
/* Unrecognised? */
if (c->d == 0 || (c->d & Undefined)) {
DPRINTF("Cannot emulate %02x\n", c->b);
@ -2705,6 +2710,13 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
special_insn:
if (c->execute) {
rc = c->execute(ctxt);
if (rc != X86EMUL_CONTINUE)
goto done;
goto writeback;
}
if (c->twobyte)
goto twobyte_insn;