KVM: PPC: Add SVCPU to Book3S_32

We need to keep the pointer to the shadow vcpu somewhere accessible from
within really early interrupt code. The best fit I found was the thread
struct, as that resides in an SPRG.

So let's put a pointer to the shadow vcpu in the thread struct and add
an asm-offset so we can find it.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/powerpc/include/asm/processor.h

@@ -229,6 +229,9 @@ struct thread_struct {
 	unsigned long	spefscr;	/* SPE & eFP status */
 	int		used_spe;	/* set if process has used spe */
 #endif /* CONFIG_SPE */
+#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
+	void*		kvm_shadow_vcpu; /* KVM internal data */
+#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
 };
 
 #define ARCH_MIN_TASKALIGN 16

arch/powerpc/kernel/asm-offsets.c

@@ -108,6 +108,9 @@ int main(void)
 	DEFINE(THREAD_USED_SPE, offsetof(struct thread_struct, used_spe));
 #endif /* CONFIG_SPE */
 #endif /* CONFIG_PPC64 */
+#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
+	DEFINE(THREAD_KVM_SVCPU, offsetof(struct thread_struct, kvm_shadow_vcpu));
+#endif
 
 	DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
 	DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags));