Commit 0234bf88 authored by Ladi Prosek's avatar Ladi Prosek Committed by Paolo Bonzini
Browse files

KVM: x86: introduce ISA specific SMM entry/exit callbacks 



Entering and exiting SMM may require ISA specific handling under certain
circumstances. This commit adds two new callbacks with empty implementations.
Actual functionality will be added in following commits.

* pre_enter_smm() is to be called when injecting an SMM, before any
  SMM related vcpu state has been changed
* pre_leave_smm() is to be called when emulating the RSM instruction,
  when the vcpu is in real mode and before any SMM related vcpu state
  has been restored

Signed-off-by: default avatarLadi Prosek <lprosek@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent d0006530

arch/x86/include/asm/kvm_emulate.h

+2 −0
Original line number Diff line number Diff line
@@ -225,6 +225,8 @@ struct x86_emulate_ops { 


	unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt);

	void (*set_hflags)(struct x86_emulate_ctxt *ctxt, unsigned hflags);

	int (*pre_leave_smm)(struct x86_emulate_ctxt *ctxt, u64 smbase);



};



typedef u32 __attribute__((vector_size(16))) sse128_t;

arch/x86/include/asm/kvm_host.h

+3 −0
Original line number Diff line number Diff line
@@ -1061,6 +1061,9 @@ struct kvm_x86_ops { 
	void (*cancel_hv_timer)(struct kvm_vcpu *vcpu);



	void (*setup_mce)(struct kvm_vcpu *vcpu);



	int (*pre_enter_smm)(struct kvm_vcpu *vcpu, char *smstate);

	int (*pre_leave_smm)(struct kvm_vcpu *vcpu, u64 smbase);

};



struct kvm_arch_async_pf {

arch/x86/kvm/emulate.c

+9 −0
Original line number Diff line number Diff line
@@ -2591,6 +2591,15 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt) 
	ctxt->ops->set_msr(ctxt, MSR_EFER, efer);



	smbase = ctxt->ops->get_smbase(ctxt);



	/*

	 * Give pre_leave_smm() a chance to make ISA-specific changes to the

	 * vCPU state (e.g. enter guest mode) before loading state from the SMM

	 * state-save area.

	 */

	if (ctxt->ops->pre_leave_smm(ctxt, smbase))

		return X86EMUL_UNHANDLEABLE;



	if (emulator_has_longmode(ctxt))

		ret = rsm_load_state_64(ctxt, smbase + 0x8000);

	else

arch/x86/kvm/svm.c

+15 −0
Original line number Diff line number Diff line
@@ -5401,6 +5401,18 @@ static void svm_setup_mce(struct kvm_vcpu *vcpu) 
	vcpu->arch.mcg_cap &= 0x1ff;

}



static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)

{

	/* TODO: Implement */

	return 0;

}



static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase)

{

	/* TODO: Implement */

	return 0;

}



static struct kvm_x86_ops svm_x86_ops __ro_after_init = {

	.cpu_has_kvm_support = has_svm,

	.disabled_by_bios = is_disabled,
@@ -5511,6 +5523,9 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = { 
	.deliver_posted_interrupt = svm_deliver_avic_intr,

	.update_pi_irte = svm_update_pi_irte,

	.setup_mce = svm_setup_mce,



	.pre_enter_smm = svm_pre_enter_smm,

	.pre_leave_smm = svm_pre_leave_smm,

};



static int __init svm_init(void)

arch/x86/kvm/vmx.c

+15 −0
Original line number Diff line number Diff line
@@ -11916,6 +11916,18 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu) 
			~FEATURE_CONTROL_LMCE;

}



static int vmx_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)

{

	/* TODO: Implement */

	return 0;

}



static int vmx_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase)

{

	/* TODO: Implement */

	return 0;

}



static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {

	.cpu_has_kvm_support = cpu_has_kvm_support,

	.disabled_by_bios = vmx_disabled_by_bios,
@@ -12041,6 +12053,9 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = { 
#endif



	.setup_mce = vmx_setup_mce,



	.pre_enter_smm = vmx_pre_enter_smm,

	.pre_leave_smm = vmx_pre_leave_smm,

};



static int __init vmx_init(void)

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