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

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

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Scott Wood 2011-04-27 17:24:10 -05:00 committed by Avi Kivity
parent 1a040b26c5
commit eab176722f
4 changed files with 15 additions and 1 deletions
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1
arch/powerpc/include/asm/kvm_host.h
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@ -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;

1
arch/powerpc/kernel/asm-offsets.c
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@ -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));

1
arch/powerpc/kvm/booke_interrupts.S
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@ -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)

13
arch/powerpc/kvm/powerpc.c
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@ -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,