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Commit 104f226b authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: VMX: Fold __vmx_vcpu_run() into vmx_vcpu_run() 



cea15c2 ("KVM: Move KVM context switch into own function") split vmx_vcpu_run()
to prevent multiple copies of the context switch from being generated (causing
problems due to a label).  This patch folds them back together again and adds
the __noclone attribute to prevent the label from being duplicated.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 30b31ab6

arch/x86/kvm/vmx.c

+25 −38
Original line number Diff line number Diff line
@@ -3904,17 +3904,33 @@ static void vmx_cancel_injection(struct kvm_vcpu *vcpu) 
#define Q "l"

#endif



/*

 * We put this into a separate noinline function to prevent the compiler

 * from duplicating the code. This is needed because this code

 * uses non local labels that cannot be duplicated.

 * Do not put any flow control into this function.

 * Better would be to put this whole monstrosity into a .S file.

 */

static void noinline do_vmx_vcpu_run(struct kvm_vcpu *vcpu)

static void vmx_vcpu_run(struct kvm_vcpu *vcpu)

{

	struct vcpu_vmx *vmx = to_vmx(vcpu);

	asm volatile(



	/* Record the guest's net vcpu time for enforced NMI injections. */

	if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))

		vmx->entry_time = ktime_get();



	/* Don't enter VMX if guest state is invalid, let the exit handler

	   start emulation until we arrive back to a valid state */

	if (vmx->emulation_required && emulate_invalid_guest_state)

		return;



	if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))

		vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);

	if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))

		vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);



	/* When single-stepping over STI and MOV SS, we must clear the

	 * corresponding interruptibility bits in the guest state. Otherwise

	 * vmentry fails as it then expects bit 14 (BS) in pending debug

	 * exceptions being set, but that's not correct for the guest debugging

	 * case. */

	if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)

		vmx_set_interrupt_shadow(vcpu, 0);



	asm(

		/* Store host registers */

		"push %%"R"dx; push %%"R"bp;"

		"push %%"R"cx \n\t"
@@ -4009,35 +4025,6 @@ static void noinline do_vmx_vcpu_run(struct kvm_vcpu *vcpu) 
		, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"

#endif

	      );

}



static void vmx_vcpu_run(struct kvm_vcpu *vcpu)

{

	struct vcpu_vmx *vmx = to_vmx(vcpu);



	/* Record the guest's net vcpu time for enforced NMI injections. */

	if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))

		vmx->entry_time = ktime_get();



	/* Don't enter VMX if guest state is invalid, let the exit handler

	   start emulation until we arrive back to a valid state */

	if (vmx->emulation_required && emulate_invalid_guest_state)

		return;



	if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))

		vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);

	if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))

		vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);



	/* When single-stepping over STI and MOV SS, we must clear the

	 * corresponding interruptibility bits in the guest state. Otherwise

	 * vmentry fails as it then expects bit 14 (BS) in pending debug

	 * exceptions being set, but that's not correct for the guest debugging

	 * case. */

	if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)

		vmx_set_interrupt_shadow(vcpu, 0);



	do_vmx_vcpu_run(vcpu);



	vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)

				  | (1 << VCPU_EXREG_PDPTR));