KVM: PPC: Book3S HV: Fix register usage when loading/saving VRSAVE

Commit 595e4f7 ("KVM: PPC: Book3S HV: Use load/store_fp_state
functions in HV guest entry/exit") changed the register usage in
kvmppc_save_fp() and kvmppc_load_fp() but omitted changing the
instructions that load and save VRSAVE.  The result is that the
VRSAVE value was loaded from a constant address, and saved to a
location past the end of the vcpu struct, causing host kernel
memory corruption and various kinds of host kernel crashes.

This fixes the problem by using register r31, which contains the
vcpu pointer, instead of r3 and r4.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/powerpc/kvm/book3s_hv_rmhandlers.S

@@ -2136,7 +2136,7 @@ BEGIN_FTR_SECTION
 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
 #endif
  mfspr r6,SPRN_VRSAVE
- stw r6,VCPU_VRSAVE(r3)
+ stw r6,VCPU_VRSAVE(r31)
  mtlr r30
  mtmsrd r5
  isync
@@ -2173,7 +2173,7 @@ BEGIN_FTR_SECTION
  bl .load_vr_state
 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
 #endif
- lwz r7,VCPU_VRSAVE(r4)
+ lwz r7,VCPU_VRSAVE(r31)
  mtspr SPRN_VRSAVE,r7
  mtlr r30
  mr r4,r31