KVM: x86 emulator: fold decode_cache into x86_emulate_ctxt
This saves a lot of pointless casts x86_emulate_ctxt and decode_cache.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7e452fe..694538a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4507,24 +4507,24 @@
kvm_queue_exception(vcpu, ctxt->exception.vector);
}
-static void init_decode_cache(struct decode_cache *c,
+static void init_decode_cache(struct x86_emulate_ctxt *ctxt,
const unsigned long *regs)
{
- memset(c, 0, offsetof(struct decode_cache, regs));
- memcpy(c->regs, regs, sizeof(c->regs));
+ memset(&ctxt->twobyte, 0,
+ (void *)&ctxt->regs - (void *)&ctxt->twobyte);
+ memcpy(ctxt->regs, regs, sizeof(ctxt->regs));
- c->fetch.start = 0;
- c->fetch.end = 0;
- c->io_read.pos = 0;
- c->io_read.end = 0;
- c->mem_read.pos = 0;
- c->mem_read.end = 0;
+ 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;
}
static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
- struct decode_cache *c = &ctxt->decode;
int cs_db, cs_l;
/*
@@ -4546,28 +4546,27 @@
X86EMUL_MODE_PROT16;
ctxt->guest_mode = is_guest_mode(vcpu);
- init_decode_cache(c, vcpu->arch.regs);
+ init_decode_cache(ctxt, vcpu->arch.regs);
vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
}
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
- struct decode_cache *c = &ctxt->decode;
int ret;
init_emulate_ctxt(vcpu);
- c->op_bytes = 2;
- c->ad_bytes = 2;
- c->_eip = ctxt->eip + inc_eip;
+ ctxt->op_bytes = 2;
+ ctxt->ad_bytes = 2;
+ ctxt->_eip = ctxt->eip + inc_eip;
ret = emulate_int_real(ctxt, irq);
if (ret != X86EMUL_CONTINUE)
return EMULATE_FAIL;
- ctxt->eip = c->_eip;
- memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
+ ctxt->eip = ctxt->_eip;
+ memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
kvm_rip_write(vcpu, ctxt->eip);
kvm_set_rflags(vcpu, ctxt->eflags);
@@ -4631,7 +4630,6 @@
{
int r;
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
- struct decode_cache *c = &ctxt->decode;
bool writeback = true;
kvm_clear_exception_queue(vcpu);
@@ -4661,7 +4659,7 @@
}
if (emulation_type & EMULTYPE_SKIP) {
- kvm_rip_write(vcpu, c->_eip);
+ kvm_rip_write(vcpu, ctxt->_eip);
return EMULATE_DONE;
}
@@ -4669,7 +4667,7 @@
changes registers values during IO operation */
if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
- memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
+ memcpy(ctxt->regs, vcpu->arch.regs, sizeof ctxt->regs);
}
restart:
@@ -4707,7 +4705,7 @@
toggle_interruptibility(vcpu, ctxt->interruptibility);
kvm_set_rflags(vcpu, ctxt->eflags);
kvm_make_request(KVM_REQ_EVENT, vcpu);
- memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
+ memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
kvm_rip_write(vcpu, ctxt->eip);
} else
@@ -5718,8 +5716,8 @@
* that usually, but some bad designed PV devices (vmware
* backdoor interface) need this to work
*/
- struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
- memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
+ struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
+ memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
}
regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
@@ -5849,7 +5847,6 @@
bool has_error_code, u32 error_code)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
- struct decode_cache *c = &ctxt->decode;
int ret;
init_emulate_ctxt(vcpu);
@@ -5860,7 +5857,7 @@
if (ret)
return EMULATE_FAIL;
- memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
+ memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
kvm_rip_write(vcpu, ctxt->eip);
kvm_set_rflags(vcpu, ctxt->eflags);
kvm_make_request(KVM_REQ_EVENT, vcpu);