KVM: PPC: Introduce shared page

For transparent variable sharing between the hypervisor and guest, I introduce
a shared page. This shared page will contain all the registers the guest can
read and write safely without exiting guest context.

This patch only implements the stubs required for the basic structure of the
shared page. The actual register moving follows.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 1c0607ddccc0..60e7db4c13af 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -400,6 +400,7 @@ int main(void)
         DEFINE(VCPU_SPRG6, offsetof(struct kvm_vcpu, arch.sprg6));
         DEFINE(VCPU_SPRG7, offsetof(struct kvm_vcpu, arch.sprg7));
         DEFINE(VCPU_SHADOW_PID, offsetof(struct kvm_vcpu, arch.shadow_pid));
+        DEFINE(VCPU_SHARED, offsetof(struct kvm_vcpu, arch.shared));
 
         /* book3s */
 #ifdef CONFIG_PPC_BOOK3S