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authorAlexander Graf <agraf@suse.de>2010-01-15 14:49:13 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2010-03-01 12:35:56 -0300
commitf7adbba1e5d464b0d449adac1eb2519be6be9728 (patch)
tree5a7580ac34b8abfb976525b9802d860e01cc3581 /arch/powerpc
parent1c0006d8d131585095c4a27dbfcfb3970807a35e (diff)
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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/kvm_host.h1
-rw-r--r--arch/powerpc/kernel/asm-offsets.c1
-rw-r--r--arch/powerpc/kvm/book3s.c13
-rw-r--r--arch/powerpc/kvm/book3s_64_interrupts.S2
4 files changed, 10 insertions, 7 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index c30a70c6b93..715aa6baf6f 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -198,6 +198,7 @@ struct kvm_vcpu_arch {
ulong msr;
#ifdef CONFIG_PPC64
ulong shadow_msr;
+ ulong shadow_srr1;
ulong hflags;
ulong guest_owned_ext;
#endif
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index ee9935442f0..957ceb7059c 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -433,6 +433,7 @@ int main(void)
DEFINE(VCPU_HOST_R2, offsetof(struct kvm_vcpu, arch.host_r2));
DEFINE(VCPU_HOST_MSR, offsetof(struct kvm_vcpu, arch.host_msr));
DEFINE(VCPU_SHADOW_MSR, offsetof(struct kvm_vcpu, arch.shadow_msr));
+ DEFINE(VCPU_SHADOW_SRR1, offsetof(struct kvm_vcpu, arch.shadow_srr1));
DEFINE(VCPU_TRAMPOLINE_LOWMEM, offsetof(struct kvm_vcpu, arch.trampoline_lowmem));
DEFINE(VCPU_TRAMPOLINE_ENTER, offsetof(struct kvm_vcpu, arch.trampoline_enter));
DEFINE(VCPU_HIGHMEM_HANDLER, offsetof(struct kvm_vcpu, arch.highmem_handler));
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 2cb181396f8..58f5200fc09 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;
diff --git a/arch/powerpc/kvm/book3s_64_interrupts.S b/arch/powerpc/kvm/book3s_64_interrupts.S
index 2ff0b2137e6..c1584d0cbce 100644
--- a/arch/powerpc/kvm/book3s_64_interrupts.S
+++ b/arch/powerpc/kvm/book3s_64_interrupts.S
@@ -169,7 +169,7 @@ kvmppc_handler_highmem:
stw r0, VCPU_LAST_INST(r7)
std r3, VCPU_PC(r7)
- std r4, VCPU_SHADOW_MSR(r7)
+ std r4, VCPU_SHADOW_SRR1(r7)
std r5, VCPU_FAULT_DEAR(r7)
std r6, VCPU_FAULT_DSISR(r7)