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Commit 063db061 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
Browse files

KVM: Provide current eip as part of emulator context. 



Eliminate the need to call back into KVM to get it from emulator.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 9c537244

arch/x86/include/asm/kvm_emulate.h

+2 −1
Original line number Diff line number Diff line
@@ -141,7 +141,7 @@ struct decode_cache { 
	u8 seg_override;

	unsigned int d;

	unsigned long regs[NR_VCPU_REGS];

	unsigned long eip, eip_orig;

	unsigned long eip;

	/* modrm */

	u8 modrm;

	u8 modrm_mod;
@@ -160,6 +160,7 @@ struct x86_emulate_ctxt { 
	struct kvm_vcpu *vcpu;



	unsigned long eflags;

	unsigned long eip; /* eip before instruction emulation */

	/* Emulated execution mode, represented by an X86EMUL_MODE value. */

	int mode;

	u32 cs_base;

arch/x86/kvm/emulate.c

+6 −6
Original line number Diff line number Diff line
@@ -667,7 +667,7 @@ static int do_insn_fetch(struct x86_emulate_ctxt *ctxt, 
	int rc;



	/* x86 instructions are limited to 15 bytes. */

	if (eip + size - ctxt->decode.eip_orig > 15)

	if (eip + size - ctxt->eip > 15)

		return X86EMUL_UNHANDLEABLE;

	eip += ctxt->cs_base;

	while (size--) {
@@ -927,7 +927,7 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
	/* Shadow copy of register state. Committed on successful emulation. */



	memset(c, 0, sizeof(struct decode_cache));

	c->eip = c->eip_orig = kvm_rip_read(ctxt->vcpu);

	c->eip = ctxt->eip;

	ctxt->cs_base = seg_base(ctxt, VCPU_SREG_CS);

	memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);
@@ -1878,7 +1878,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
			}

		}

		register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);

		c->eip = kvm_rip_read(ctxt->vcpu);

		c->eip = ctxt->eip;

	}



	if (c->src.type == OP_MEM) {
@@ -2447,7 +2447,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
				goto done;



			/* Let the processor re-execute the fixed hypercall */

			c->eip = kvm_rip_read(ctxt->vcpu);

			c->eip = ctxt->eip;

			/* Disable writeback. */

			c->dst.type = OP_NONE;

			break;
@@ -2551,7 +2551,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
			| ((u64)c->regs[VCPU_REGS_RDX] << 32);

		if (kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data)) {

			kvm_inject_gp(ctxt->vcpu, 0);

			c->eip = kvm_rip_read(ctxt->vcpu);

			c->eip = ctxt->eip;

		}

		rc = X86EMUL_CONTINUE;

		c->dst.type = OP_NONE;
@@ -2560,7 +2560,7 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
		/* rdmsr */

		if (kvm_get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data)) {

			kvm_inject_gp(ctxt->vcpu, 0);

			c->eip = kvm_rip_read(ctxt->vcpu);

			c->eip = ctxt->eip;

		} else {

			c->regs[VCPU_REGS_RAX] = (u32)msr_data;

			c->regs[VCPU_REGS_RDX] = msr_data >> 32;

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -3531,6 +3531,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu, 


		vcpu->arch.emulate_ctxt.vcpu = vcpu;

		vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);

		vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);

		vcpu->arch.emulate_ctxt.mode =

			(!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :

			(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)