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authorScott Wood <scottwood@freescale.com>2011-11-09 01:23:30 +0100
committerAvi Kivity <avi@redhat.com>2012-03-05 13:52:26 +0100
commitb59049720dd95021dfe0d9f4e1fa9458a67cfe29 (patch)
tree3b54577e12ba4a84bec409518c6c8f399ebba6e0 /arch/powerpc/kvm/book3s.c
parentKVM: PPC: booke: Paravirtualize wrtee (diff)
downloadlinux-b59049720dd95021dfe0d9f4e1fa9458a67cfe29.tar.xz
linux-b59049720dd95021dfe0d9f4e1fa9458a67cfe29.zip
KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn
This allows additional registers to be accessed by the guest in PR-mode KVM without trapping. SPRG4-7 are readable from userspace. On booke, KVM will sync these registers when it enters the guest, so that accesses from guest userspace will work. The guest kernel, OTOH, must consistently use either the real registers or the shared area between exits. This also applies to the already-paravirted SPRG3. On non-booke, it's not clear to what extent SPRG4-7 are supported (they're not architected for book3s, but exist on at least some classic chips). They are copied in the get/set regs ioctls, but I do not see any non-booke emulation. I also do not see any syncing with real registers (in PR-mode) including the user-readable SPRG3. This patch should not make that situation any worse. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/book3s.c')
-rw-r--r--arch/powerpc/kvm/book3s.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 73fc9f046107..5398744cd773 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -423,10 +423,10 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
regs->sprg1 = vcpu->arch.shared->sprg1;
regs->sprg2 = vcpu->arch.shared->sprg2;
regs->sprg3 = vcpu->arch.shared->sprg3;
- regs->sprg4 = vcpu->arch.sprg4;
- regs->sprg5 = vcpu->arch.sprg5;
- regs->sprg6 = vcpu->arch.sprg6;
- regs->sprg7 = vcpu->arch.sprg7;
+ regs->sprg4 = vcpu->arch.shared->sprg4;
+ regs->sprg5 = vcpu->arch.shared->sprg5;
+ regs->sprg6 = vcpu->arch.shared->sprg6;
+ regs->sprg7 = vcpu->arch.shared->sprg7;
for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
@@ -450,10 +450,10 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
vcpu->arch.shared->sprg1 = regs->sprg1;
vcpu->arch.shared->sprg2 = regs->sprg2;
vcpu->arch.shared->sprg3 = regs->sprg3;
- vcpu->arch.sprg4 = regs->sprg4;
- vcpu->arch.sprg5 = regs->sprg5;
- vcpu->arch.sprg6 = regs->sprg6;
- vcpu->arch.sprg7 = regs->sprg7;
+ vcpu->arch.shared->sprg4 = regs->sprg4;
+ vcpu->arch.shared->sprg5 = regs->sprg5;
+ vcpu->arch.shared->sprg6 = regs->sprg6;
+ vcpu->arch.shared->sprg7 = regs->sprg7;
for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
kvmppc_set_gpr(vcpu, i, regs->gpr[i]);