[PATCH 3/7] KVM: PPC: booke: Added debug handler

Alexander Graf
2013-03-22T14:25:59Z

From: Bharat Bhushan <r65777@freescale.com>

Installed debug handler will be used for guest debug support
and debug facility emulation features (patches for these
features will follow this patch).

Signed-off-by: Liu Yu <yu.liu@freescale.com>
[bharat.bhushan@freescale.com: Substantial changes]
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
arch/powerpc/include/asm/kvm_host.h | 1 +
arch/powerpc/kernel/asm-offsets.c | 1 +
arch/powerpc/kvm/booke_interrupts.S | 42 ++++++++++++++++++++++++++++++++--
3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index d1bb860..e34f8fe 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -504,6 +504,7 @@ struct kvm_vcpu_arch {
u32 tlbcfg[4];
u32 mmucfg;
u32 epr;
+ u32 crit_save;
struct kvmppc_booke_debug_reg dbg_reg;
#endif
gpa_t paddr_accessed;
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index b6c17ec..d87c908 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -596,6 +596,7 @@ int main(void)
DEFINE(VCPU_LAST_INST, offsetof(struct kvm_vcpu, arch.last_inst));
DEFINE(VCPU_FAULT_DEAR, offsetof(struct kvm_vcpu, arch.fault_dear));
DEFINE(VCPU_FAULT_ESR, offsetof(struct kvm_vcpu, arch.fault_esr));
+ DEFINE(VCPU_CRIT_SAVE, offsetof(struct kvm_vcpu, arch.crit_save));
#endif /* CONFIG_PPC_BOOK3S */
#endif /* CONFIG_KVM */

diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S
index f4bb55c..2c6deb5 100644
--- a/arch/powerpc/kvm/booke_interrupts.S
+++ b/arch/powerpc/kvm/booke_interrupts.S
@@ -54,8 +54,7 @@
(1<<BOOKE_INTERRUPT_DTLB_MISS) | \
(1<<BOOKE_INTERRUPT_ALIGNMENT))

-.macro KVM_HANDLER ivor_nr scratch srr0
-_GLOBAL(kvmppc_handler_\ivor_nr)
+.macro __KVM_HANDLER ivor_nr scratch srr0
/* Get pointer to vcpu and record exit number. */
mtspr \scratch , r4
mfspr r4, SPRN_SPRG_THREAD
@@ -76,6 +75,43 @@ _GLOBAL(kvmppc_handler_\ivor_nr)
bctr
.endm

+.macro KVM_HANDLER ivor_nr scratch srr0
+_GLOBAL(kvmppc_handler_\ivor_nr)
+ __KVM_HANDLER \ivor_nr \scratch \srr0
+.endm
+
+.macro KVM_DBG_HANDLER ivor_nr scratch srr0
+_GLOBAL(kvmppc_handler_\ivor_nr)
+ mtspr \scratch, r4
+ mfspr r4, SPRN_SPRG_THREAD
+ lwz r4, THREAD_KVM_VCPU(r4)
+ stw r3, VCPU_CRIT_SAVE(r4)
+ mfcr r3
+ mfspr r4, SPRN_CSRR1
+ andi. r4, r4, MSR_PR
+ bne 1f
+ /* debug interrupt happened in enter/exit path */
+ mfspr r4, SPRN_CSRR1
+ rlwinm r4, r4, 0, ~MSR_DE
+ mtspr SPRN_CSRR1, r4
+ lis r4, 0xffff
+ ori r4, r4, 0xffff
+ mtspr SPRN_DBSR, r4
+ mfspr r4, SPRN_SPRG_THREAD
+ lwz r4, THREAD_KVM_VCPU(r4)
+ mtcr r3
+ lwz r3, VCPU_CRIT_SAVE(r4)
+ mfspr r4, \scratch
+ rfci
+1: /* debug interrupt happened in guest */
+ mtcr r3
+ mfspr r4, SPRN_SPRG_THREAD
+ lwz r4, THREAD_KVM_VCPU(r4)
+ lwz r3, VCPU_CRIT_SAVE(r4)
+ mfspr r4, \scratch
+ __KVM_HANDLER \ivor_nr \scratch \srr0
+.endm
+
.macro KVM_HANDLER_ADDR ivor_nr
.long kvmppc_handler_\ivor_nr
.endm
@@ -100,7 +136,7 @@ KVM_HANDLER BOOKE_INTERRUPT_FIT SPRN_SPRG_RSCRATCH0 SPRN_SRR0
KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS SPRN_SPRG_RSCRATCH0 SPRN_SRR0
KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS SPRN_SPRG_RSCRATCH0 SPRN_SRR0
-KVM_HANDLER BOOKE_INTERRUPT_DEBUG SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
+KVM_DBG_HANDLER BOOKE_INTERRUPT_DEBUG SPRN_SPRG_RSCRATCH_CRIT SPRN_CSRR0
KVM_HANDLER BOOKE_INTERRUPT_SPE_UNAVAIL SPRN_SPRG_RSCRATCH0 SPRN_SRR0
KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_DATA SPRN_SPRG_RSCRATCH0 SPRN_SRR0
KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_ROUND SPRN_SPRG_RSCRATCH0 SPRN_SRR0
--
1.6.0.2