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Commit 38e5e92f authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

KVM: SVM: Implement Flush-By-Asid feature 



This patch adds the new flush-by-asid of upcoming AMD
processors to the KVM-AMD module.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent f40f6a45

arch/x86/include/asm/svm.h

+2 −0
Original line number Diff line number Diff line
@@ -88,6 +88,8 @@ struct __attribute__ ((__packed__)) vmcb_control_area { 


#define TLB_CONTROL_DO_NOTHING 0

#define TLB_CONTROL_FLUSH_ALL_ASID 1

#define TLB_CONTROL_FLUSH_ASID 3

#define TLB_CONTROL_FLUSH_ASID_LOCAL 7



#define V_TPR_MASK 0x0f

arch/x86/kvm/svm.c

+8 −2
Original line number Diff line number Diff line
@@ -3158,7 +3158,6 @@ static void pre_svm_run(struct vcpu_svm *svm) 


	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);



	svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;

	/* FIXME: handle wraparound of asid_generation */

	if (svm->asid_generation != sd->asid_generation)

		new_asid(svm, sd);
@@ -3303,7 +3302,12 @@ static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) 


static void svm_flush_tlb(struct kvm_vcpu *vcpu)

{

	to_svm(vcpu)->asid_generation--;

	struct vcpu_svm *svm = to_svm(vcpu);



	if (static_cpu_has(X86_FEATURE_FLUSHBYASID))

		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;

	else

		svm->asid_generation--;

}



static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
@@ -3529,6 +3533,8 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) 


	svm->next_rip = 0;



	svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;



	/* if exit due to PF check for async PF */

	if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)

		svm->apf_reason = kvm_read_and_reset_pf_reason();