Commit 36241b8c authored by Avi Kivity's avatar Avi Kivity Committed by Linus Torvalds
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[PATCH] KVM: AMD SVM: Save and restore the floating point unit state 



Fixes sf bug 1614113 (segfaults in nbench).

Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 0e859cac

drivers/kvm/svm.c

+9 −0
Original line number Diff line number Diff line
@@ -575,6 +575,8 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu) 
	memset(vcpu->svm->db_regs, 0, sizeof(vcpu->svm->db_regs));

	init_vmcb(vcpu->svm->vmcb);



	fx_init(vcpu);



	return 0;



out2:
@@ -1387,6 +1389,10 @@ static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 
		save_db_regs(vcpu->svm->host_db_regs);

		load_db_regs(vcpu->svm->db_regs);

	}



	fx_save(vcpu->host_fx_image);

	fx_restore(vcpu->guest_fx_image);



	asm volatile (

#ifdef CONFIG_X86_64

		"push %%rbx; push %%rcx; push %%rdx;"
@@ -1496,6 +1502,9 @@ static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 
#endif

		: "cc", "memory" );



	fx_save(vcpu->guest_fx_image);

	fx_restore(vcpu->host_fx_image);



	if ((vcpu->svm->vmcb->save.dr7 & 0xff))

		load_db_regs(vcpu->svm->host_db_regs);