[PATCH] KVM: PPC: Align pt_regs in kvm_vcpu_arch structure

[Fabiano Rosas]

The H_ENTER_NESTED hypercall receives as second parameter the address
of a region of memory containing the values for the nested guest
privileged registers. We currently use the pt_regs structure contained
within kvm_vcpu_arch for that end.

Most hypercalls that receive a memory address expect that region to
not cross a 4k page boundary. We would want H_ENTER_NESTED to follow
the same pattern so this patch ensures the pt_regs structure sits
within a page.

Signed-off-by: Fabiano Rosas <farosas at linux.ibm.com>
---
 arch/powerpc/include/asm/kvm_host.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index faf301d0dec0..87eba60f2920 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -519,7 +519,11 @@ struct kvm_vcpu_arch {
 	struct kvmppc_book3s_shadow_vcpu *shadow_vcpu;
 #endif
 
-	struct pt_regs regs;
+	/*
+	 * This is passed along to the HV via H_ENTER_NESTED. Align to
+	 * prevent it crossing a real 4K page.
+	 */
+	struct pt_regs regs __aligned(512);
 
 	struct thread_fp_state fp;
 
-- 
2.35.1