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@xxxxxxxxxxxxx>
[bharat.bhushan@xxxxxxxxxxxxx: Substantial changes]
Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>
Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>
---
arch/powerpc/include/asm/kvm_host.h | 1 +
arch/powerpc/kernel/asm-offsets.c | 1 +
arch/powerpc/kvm/booke_interrupts.S | 45 +++++++++++++++++++++++++++++++++++
3 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index dcee499..bd78523 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -494,6 +494,7 @@ struct kvm_vcpu_arch {
u32 tlbcfg[4];
u32 mmucfg;
u32 epr;
+ u32 crit_save;
#endif
gpa_t paddr_accessed;
gva_t vaddr_accessed;
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 85b05c4..92f149b 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -563,6 +563,7 @@ 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 3539805..890673c 100644
--- a/arch/powerpc/kvm/booke_interrupts.S
+++ b/arch/powerpc/kvm/booke_interrupts.S
@@ -73,6 +73,51 @@ _GLOBAL(kvmppc_handler_\ivor_nr)
bctr
.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 */
+ mfspr r4, \scratch
+ mtcr r3
+ mr r3, r4
+ mfspr r4, SPRN_SPRG_THREAD
+ lwz r4, THREAD_KVM_VCPU(r4)
+ stw r3, VCPU_GPR(R4)(r4)
+ stw r5, VCPU_GPR(R5)(r4)
+ stw r6, VCPU_GPR(R6)(r4)
+ lwz r3, VCPU_CRIT_SAVE(r4)
+ mfspr r5, \srr0
+ stw r3, VCPU_GPR(R3)(r4)
+ stw r5, VCPU_PC(r4)
+ mfctr r5
+ lis r6, kvmppc_resume_host@h
+ stw r5, VCPU_CTR(r4)
+ li r5, \ivor_nr
+ ori r6, r6, kvmppc_resume_host@l
+ mtctr r6
+ bctr
+.endm
+
.macro KVM_HANDLER_ADDR ivor_nr
.long kvmppc_handler_\ivor_nr
.endm
--
1.7.0.4
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