KVM: PPC: Fix initial GPR settings

Commit 7d01b4c3ed2bb33ceaf2d270cb4831a67a76b51b introduced PACA backed vcpu
values. With this patch, when a userspace app was setting GPRs before it was
actually first loaded, the set values get discarded.

This is because vcpu_load loads them from the vcpu backing store that we use
whenever we're not owning the PACA.

That behavior is not really a major problem, because we don't need it for
qemu. Other users (like kvmctl) do have problems with it though, so let's
better do it right.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 09816da9e95..e2642829e43 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -28,6 +28,9 @@
 #include <linux/types.h>
 #include <linux/kvm_types.h>
 #include <linux/kvm_host.h>
+#ifdef CONFIG_PPC_BOOK3S
+#include <asm/kvm_book3s.h>
+#endif
 
 enum emulation_result {
         EMULATE_DONE,         /* no further processing */
@@ -102,9 +105,10 @@ extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu);
 
 static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
 {
-        if ( num < 14 )
+        if ( num < 14 ) {
                 get_paca()->shadow_vcpu.gpr[num] = val;
-        else
+                to_book3s(vcpu)->shadow_vcpu.gpr[num] = val;
+        } else
                 vcpu->arch.gpr[num] = val;
 }
 
@@ -119,6 +123,7 @@ static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num)
 static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val)
 {
         get_paca()->shadow_vcpu.cr = val;
+        to_book3s(vcpu)->shadow_vcpu.cr = val;
 }
 
 static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
@@ -129,6 +134,7 @@ static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
 static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, u32 val)
 {
         get_paca()->shadow_vcpu.xer = val;
+        to_book3s(vcpu)->shadow_vcpu.xer = val;
 }
 
 static inline u32 kvmppc_get_xer(struct kvm_vcpu *vcpu)