KVM: PPC: Convert SPRG[0-4] to shared page

When in kernel mode there are 4 additional registers available that are
simple data storage. Instead of exiting to the hypervisor to read and
write those, we can just share them with the guest using the page.

This patch converts all users of the current field to the shared page.

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

5 files changed, 36 insertions, 28 deletions

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 5255d754f9a9..221cf85e9a6e 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -217,10 +217,6 @@ struct kvm_vcpu_arch {
         ulong guest_owned_ext;
 #endif
         u32 mmucr;
-        ulong sprg0;
-        ulong sprg1;
-        ulong sprg2;
-        ulong sprg3;
         ulong sprg4;
         ulong sprg5;
         ulong sprg6;
diff --git a/arch/powerpc/include/asm/kvm_para.h b/arch/powerpc/include/asm/kvm_para.h
index d7fc6c2c9730..e402999ba193 100644
--- a/arch/powerpc/include/asm/kvm_para.h
+++ b/arch/powerpc/include/asm/kvm_para.h
@@ -23,6 +23,10 @@
 #include <linux/types.h>
 
 struct kvm_vcpu_arch_shared {
+        __u64 sprg0;
+        __u64 sprg1;
+        __u64 sprg2;
+        __u64 sprg3;
         __u64 srr0;
         __u64 srr1;
         __u64 dar;
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index afa0dd4a27f4..cfd7fe5c3a62 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -1062,10 +1062,10 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
         regs->srr0 = vcpu->arch.shared->srr0;
         regs->srr1 = vcpu->arch.shared->srr1;
         regs->pid = vcpu->arch.pid;
-        regs->sprg0 = vcpu->arch.sprg0;
-        regs->sprg1 = vcpu->arch.sprg1;
-        regs->sprg2 = vcpu->arch.sprg2;
-        regs->sprg3 = vcpu->arch.sprg3;
+        regs->sprg0 = vcpu->arch.shared->sprg0;
+        regs->sprg1 = vcpu->arch.shared->sprg1;
+        regs->sprg2 = vcpu->arch.shared->sprg2;
+        regs->sprg3 = vcpu->arch.shared->sprg3;
         regs->sprg5 = vcpu->arch.sprg4;
         regs->sprg6 = vcpu->arch.sprg5;
         regs->sprg7 = vcpu->arch.sprg6;
@@ -1088,10 +1088,10 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
         kvmppc_set_msr(vcpu, regs->msr);
         vcpu->arch.shared->srr0 = regs->srr0;
         vcpu->arch.shared->srr1 = regs->srr1;
-        vcpu->arch.sprg0 = regs->sprg0;
-        vcpu->arch.sprg1 = regs->sprg1;
-        vcpu->arch.sprg2 = regs->sprg2;
-        vcpu->arch.sprg3 = regs->sprg3;
+        vcpu->arch.shared->sprg0 = regs->sprg0;
+        vcpu->arch.shared->sprg1 = regs->sprg1;
+        vcpu->arch.shared->sprg2 = regs->sprg2;
+        vcpu->arch.shared->sprg3 = regs->sprg3;
         vcpu->arch.sprg5 = regs->sprg4;
         vcpu->arch.sprg6 = regs->sprg5;
         vcpu->arch.sprg7 = regs->sprg6;
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 793df28b628d..b2c8c423c4d5 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -495,10 +495,10 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
         regs->srr0 = vcpu->arch.shared->srr0;
         regs->srr1 = vcpu->arch.shared->srr1;
         regs->pid = vcpu->arch.pid;
-        regs->sprg0 = vcpu->arch.sprg0;
-        regs->sprg1 = vcpu->arch.sprg1;
-        regs->sprg2 = vcpu->arch.sprg2;
-        regs->sprg3 = vcpu->arch.sprg3;
+        regs->sprg0 = vcpu->arch.shared->sprg0;
+        regs->sprg1 = vcpu->arch.shared->sprg1;
+        regs->sprg2 = vcpu->arch.shared->sprg2;
+        regs->sprg3 = vcpu->arch.shared->sprg3;
         regs->sprg5 = vcpu->arch.sprg4;
         regs->sprg6 = vcpu->arch.sprg5;
         regs->sprg7 = vcpu->arch.sprg6;
@@ -521,10 +521,10 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
         kvmppc_set_msr(vcpu, regs->msr);
         vcpu->arch.shared->srr0 = regs->srr0;
         vcpu->arch.shared->srr1 = regs->srr1;
-        vcpu->arch.sprg0 = regs->sprg0;
-        vcpu->arch.sprg1 = regs->sprg1;
-        vcpu->arch.sprg2 = regs->sprg2;
-        vcpu->arch.sprg3 = regs->sprg3;
+        vcpu->arch.shared->sprg0 = regs->sprg0;
+        vcpu->arch.shared->sprg1 = regs->sprg1;
+        vcpu->arch.shared->sprg2 = regs->sprg2;
+        vcpu->arch.shared->sprg3 = regs->sprg3;
         vcpu->arch.sprg5 = regs->sprg4;
         vcpu->arch.sprg6 = regs->sprg5;
         vcpu->arch.sprg7 = regs->sprg6;
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index ad0fa4ff4ea0..454869b5e91e 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -263,13 +263,17 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
                                 kvmppc_set_gpr(vcpu, rt, get_tb()); break;
 
                         case SPRN_SPRG0:
-                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg0); break;
+                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg0);
+                                break;
                         case SPRN_SPRG1:
-                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg1); break;
+                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg1);
+                                break;
                         case SPRN_SPRG2:
-                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg2); break;
+                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg2);
+                                break;
                         case SPRN_SPRG3:
-                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg3); break;
+                                kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg3);
+                                break;
                         /* Note: SPRG4-7 are user-readable, so we don't get
                          * a trap. */
 
@@ -341,13 +345,17 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
                                 break;
 
                         case SPRN_SPRG0:
-                                vcpu->arch.sprg0 = kvmppc_get_gpr(vcpu, rs); break;
+                                vcpu->arch.shared->sprg0 = kvmppc_get_gpr(vcpu, rs);
+                                break;
                         case SPRN_SPRG1:
-                                vcpu->arch.sprg1 = kvmppc_get_gpr(vcpu, rs); break;
+                                vcpu->arch.shared->sprg1 = kvmppc_get_gpr(vcpu, rs);
+                                break;
                         case SPRN_SPRG2:
-                                vcpu->arch.sprg2 = kvmppc_get_gpr(vcpu, rs); break;
+                                vcpu->arch.shared->sprg2 = kvmppc_get_gpr(vcpu, rs);
+                                break;
                         case SPRN_SPRG3:
-                                vcpu->arch.sprg3 = kvmppc_get_gpr(vcpu, rs); break;
+                                vcpu->arch.shared->sprg3 = kvmppc_get_gpr(vcpu, rs);
+                                break;
 
                         default:
                                 emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs);