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authorPaul Mackerras <paulus@samba.org>2011-06-29 00:18:26 +0000
committerAvi Kivity <avi@redhat.com>2011-07-12 13:16:48 +0300
commitb01c8b54a1a271c0fc4243845927fe1d250767a3 (patch)
tree4e818a41d602aa07cbdc06eca9372b9b95c533a4 /arch/powerpc/kvm/book3s_rmhandlers.S
parentf05ed4d56e9cff1c46d2b3049ba0c72e7e29392f (diff)
powerpc, KVM: Rework KVM checks in first-level interrupt handlers
Instead of branching out-of-line with the DO_KVM macro to check if we are in a KVM guest at the time of an interrupt, this moves the KVM check inline in the first-level interrupt handlers. This speeds up the non-KVM case and makes sure that none of the interrupt handlers are missing the check. Because the first-level interrupt handlers are now larger, some things had to be move out of line in exceptions-64s.S. This all necessitated some minor changes to the interrupt entry code in KVM. This also streamlines the book3s_32 KVM test. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_rmhandlers.S')
-rw-r--r--arch/powerpc/kvm/book3s_rmhandlers.S78
1 files changed, 41 insertions, 37 deletions
diff --git a/arch/powerpc/kvm/book3s_rmhandlers.S b/arch/powerpc/kvm/book3s_rmhandlers.S
index 5f5d07475c91..dd03689fc609 100644
--- a/arch/powerpc/kvm/book3s_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_rmhandlers.S
@@ -40,37 +40,42 @@
#define MSR_NOIRQ MSR_KERNEL & ~(MSR_IR | MSR_DR)
#define FUNC(name) GLUE(.,name)
-#elif defined(CONFIG_PPC_BOOK3S_32)
+kvmppc_skip_interrupt:
+ /*
+ * Here all GPRs are unchanged from when the interrupt happened
+ * except for r13, which is saved in SPRG_SCRATCH0.
+ */
+ mfspr r13, SPRN_SRR0
+ addi r13, r13, 4
+ mtspr SPRN_SRR0, r13
+ GET_SCRATCH0(r13)
+ rfid
+ b .
+
+kvmppc_skip_Hinterrupt:
+ /*
+ * Here all GPRs are unchanged from when the interrupt happened
+ * except for r13, which is saved in SPRG_SCRATCH0.
+ */
+ mfspr r13, SPRN_HSRR0
+ addi r13, r13, 4
+ mtspr SPRN_HSRR0, r13
+ GET_SCRATCH0(r13)
+ hrfid
+ b .
-#define LOAD_SHADOW_VCPU(reg) \
- mfspr reg, SPRN_SPRG_THREAD; \
- lwz reg, THREAD_KVM_SVCPU(reg); \
- /* PPC32 can have a NULL pointer - let's check for that */ \
- mtspr SPRN_SPRG_SCRATCH1, r12; /* Save r12 */ \
- mfcr r12; \
- cmpwi reg, 0; \
- bne 1f; \
- mfspr reg, SPRN_SPRG_SCRATCH0; \
- mtcr r12; \
- mfspr r12, SPRN_SPRG_SCRATCH1; \
- b kvmppc_resume_\intno; \
-1:; \
- mtcr r12; \
- mfspr r12, SPRN_SPRG_SCRATCH1; \
- tophys(reg, reg)
+#elif defined(CONFIG_PPC_BOOK3S_32)
#define SHADOW_VCPU_OFF 0
#define MSR_NOIRQ MSR_KERNEL
#define FUNC(name) name
-#endif
-
.macro INTERRUPT_TRAMPOLINE intno
.global kvmppc_trampoline_\intno
kvmppc_trampoline_\intno:
- SET_SCRATCH0(r13) /* Save r13 */
+ mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
/*
* First thing to do is to find out if we're coming
@@ -78,19 +83,28 @@ kvmppc_trampoline_\intno:
*
* To distinguish, we check a magic byte in the PACA/current
*/
- LOAD_SHADOW_VCPU(r13)
- PPC_STL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
+ mfspr r13, SPRN_SPRG_THREAD
+ lwz r13, THREAD_KVM_SVCPU(r13)
+ /* PPC32 can have a NULL pointer - let's check for that */
+ mtspr SPRN_SPRG_SCRATCH1, r12 /* Save r12 */
mfcr r12
+ cmpwi r13, 0
+ bne 1f
+2: mtcr r12
+ mfspr r12, SPRN_SPRG_SCRATCH1
+ mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
+ b kvmppc_resume_\intno /* Get back original handler */
+
+1: tophys(r13, r13)
stw r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
+ mfspr r12, SPRN_SPRG_SCRATCH1
+ stw r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
lbz r12, (SHADOW_VCPU_OFF + SVCPU_IN_GUEST)(r13)
cmpwi r12, KVM_GUEST_MODE_NONE
bne ..kvmppc_handler_hasmagic_\intno
/* No KVM guest? Then jump back to the Linux handler! */
lwz r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)
- mtcr r12
- PPC_LL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
- GET_SCRATCH0(r13) /* r13 = original r13 */
- b kvmppc_resume_\intno /* Get back original handler */
+ b 2b
/* Now we know we're handling a KVM guest */
..kvmppc_handler_hasmagic_\intno:
@@ -112,9 +126,6 @@ INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL
-#ifdef CONFIG_PPC_BOOK3S_64
-INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL_HV
-#endif
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL
@@ -124,14 +135,6 @@ INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC
-/* Those are only available on 64 bit machines */
-
-#ifdef CONFIG_PPC_BOOK3S_64
-INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_SEGMENT
-INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_SEGMENT
-INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_VSX
-#endif
-
/*
* Bring us back to the faulting code, but skip the
* faulting instruction.
@@ -163,6 +166,7 @@ kvmppc_handler_skip_ins:
/* And get back into the code */
RFI
+#endif
/*
* This trampoline brings us back to a real mode handler