KVM: PPC: Keep SRR1 flags around in shadow_msr

SRR1 stores more information that just the MSR value. It also stores
valuable information about the type of interrupt we received, for
example whether the storage interrupt we just got was because of a
missing htab entry or not.

We use that information to speed up the exit path.

Now if we get preempted before we can interpret the shadow_msr values,
we get into vcpu_put which then calls the MSR handler, which then sets
all the SRR1 information bits in shadow_msr to 0. Great.

So let's preserve the SRR1 specific bits in shadow_msr whenever we set
the MSR. They don't hurt.

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

1 files changed, 7 insertions, 6 deletions

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 2cb181396f82..58f5200fc09b 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -524,14 +524,14 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
                 /* Page not found in guest PTE entries */
                 vcpu->arch.dear = vcpu->arch.fault_dear;
                 to_book3s(vcpu)->dsisr = vcpu->arch.fault_dsisr;
-                vcpu->arch.msr |= (vcpu->arch.shadow_msr & 0x00000000f8000000ULL);
+                vcpu->arch.msr |= (vcpu->arch.shadow_srr1 & 0x00000000f8000000ULL);
                 kvmppc_book3s_queue_irqprio(vcpu, vec);
         } else if (page_found == -EPERM) {
                 /* Storage protection */
                 vcpu->arch.dear = vcpu->arch.fault_dear;
                 to_book3s(vcpu)->dsisr = vcpu->arch.fault_dsisr & ~DSISR_NOHPTE;
                 to_book3s(vcpu)->dsisr |= DSISR_PROTFAULT;
-                vcpu->arch.msr |= (vcpu->arch.shadow_msr & 0x00000000f8000000ULL);
+                vcpu->arch.msr |= (vcpu->arch.shadow_srr1 & 0x00000000f8000000ULL);
                 kvmppc_book3s_queue_irqprio(vcpu, vec);
         } else if (page_found == -EINVAL) {
                 /* Page not found in guest SLB */
@@ -693,7 +693,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
         case BOOK3S_INTERRUPT_INST_STORAGE:
                 vcpu->stat.pf_instruc++;
                 /* only care about PTEG not found errors, but leave NX alone */
-                if (vcpu->arch.shadow_msr & 0x40000000) {
+                if (vcpu->arch.shadow_srr1 & 0x40000000) {
                         r = kvmppc_handle_pagefault(run, vcpu, vcpu->arch.pc, exit_nr);
                         vcpu->stat.sp_instruc++;
                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
@@ -705,7 +705,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
                          */
                         kvmppc_mmu_pte_flush(vcpu, vcpu->arch.pc, ~0xFFFULL);
                 } else {
-                        vcpu->arch.msr |= (vcpu->arch.shadow_msr & 0x58000000);
+                        vcpu->arch.msr |= vcpu->arch.shadow_srr1 & 0x58000000;
                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                         kvmppc_mmu_pte_flush(vcpu, vcpu->arch.pc, ~0xFFFULL);
                         r = RESUME_GUEST;
@@ -753,7 +753,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
                 enum emulation_result er;
                 ulong flags;
 
-                flags = (vcpu->arch.shadow_msr & 0x1f0000ull);
+                flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
 
                 if (vcpu->arch.msr & MSR_PR) {
 #ifdef EXIT_DEBUG
@@ -808,7 +808,8 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
                 break;
         default:
                 /* Ugh - bork here! What did we get? */
-                printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n", exit_nr, vcpu->arch.pc, vcpu->arch.shadow_msr);
+                printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
+                        exit_nr, vcpu->arch.pc, vcpu->arch.shadow_srr1);
                 r = RESUME_HOST;
                 BUG();
                 break;