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Commit eab17672 authored by Scott Wood's avatar Scott Wood Committed by Avi Kivity
Browse files

KVM: PPC: booke: save/restore VRSAVE (a.k.a. USPRG0) 



Linux doesn't use USPRG0 (now renamed VRSAVE in the architecture, even
when Altivec isn't involved), but a guest might.

Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 1a040b26

arch/powerpc/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -223,6 +223,7 @@ struct kvm_vcpu_arch { 
	ulong hflags;

	ulong guest_owned_ext;

#endif

	u32 vrsave; /* also USPRG0 */

	u32 mmucr;

	ulong sprg4;

	ulong sprg5;

arch/powerpc/kernel/asm-offsets.c

+1 −0
Original line number Diff line number Diff line
@@ -395,6 +395,7 @@ int main(void) 
	DEFINE(VCPU_HOST_STACK, offsetof(struct kvm_vcpu, arch.host_stack));

	DEFINE(VCPU_HOST_PID, offsetof(struct kvm_vcpu, arch.host_pid));

	DEFINE(VCPU_GPRS, offsetof(struct kvm_vcpu, arch.gpr));

	DEFINE(VCPU_VRSAVE, offsetof(struct kvm_vcpu, arch.vrsave));

	DEFINE(VCPU_SPRG4, offsetof(struct kvm_vcpu, arch.sprg4));

	DEFINE(VCPU_SPRG5, offsetof(struct kvm_vcpu, arch.sprg5));

	DEFINE(VCPU_SPRG6, offsetof(struct kvm_vcpu, arch.sprg6));

arch/powerpc/kvm/booke_interrupts.S

+0 −1
Original line number Diff line number Diff line
@@ -380,7 +380,6 @@ lightweight_exit: 
	 * because host interrupt handlers would get confused. */

	lwz	r1, VCPU_GPR(r1)(r4)



	/* XXX handle USPRG0 */

	/* Host interrupt handlers may have clobbered these guest-readable

	 * SPRGs, so we need to reload them here with the guest's values. */

	lwz	r3, VCPU_SPRG4(r4)

arch/powerpc/kvm/powerpc.c

+13 −0
Original line number Diff line number Diff line
@@ -298,12 +298,25 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) 


void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)

{

#ifdef CONFIG_BOOKE

	/*

	 * vrsave (formerly usprg0) isn't used by Linux, but may

	 * be used by the guest.

	 *

	 * On non-booke this is associated with Altivec and

	 * is handled by code in book3s.c.

	 */

	mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);

#endif

	kvmppc_core_vcpu_load(vcpu, cpu);

}



void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)

{

	kvmppc_core_vcpu_put(vcpu);

#ifdef CONFIG_BOOKE

	vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);

#endif

}



int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,