Patchwork [2/2] KVM: PPC: booke: Added debug handler

login
register
mail settings
Submitter Bharat Bhushan
Date July 30, 2012, 11:11 a.m.
Message ID <1343646694-19665-2-git-send-email-Bharat.Bhushan@freescale.com>
Download mbox | patch
Permalink /patch/173986/
State New
Headers show

Comments

Bharat Bhushan - July 30, 2012, 11:11 a.m.
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>
---
 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(-)
Scott Wood - July 31, 2012, 12:55 a.m.
On 07/30/2012 06:11 AM, Bharat Bhushan wrote:
> +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)

You're not working on the latest tree -- all this stuff is
"VCPU_GPR(R6)(r4)" now.

-Scott


--
To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 7a45194..daa2222 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -492,6 +492,7 @@  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 52c7ad7..6f7c1c9 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -562,6 +562,7 @@  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 c7aebc5..e002c34 100644
--- a/arch/powerpc/kvm/booke_interrupts.S
+++ b/arch/powerpc/kvm/booke_interrupts.S
@@ -74,6 +74,51 @@  _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