Patchwork [3/5] KVM: PPC: Book3S: PR: Fix hsrr code

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Submitter Alexander Graf
Date May 16, 2012, 1:05 p.m.
Message ID <1337173519-6780-4-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/159625/
State New
Headers show

Comments

Alexander Graf - May 16, 2012, 1:05 p.m.
When jumping back into the kernel to code that knows that it would be
using HSRR registers instead of SRR registers, we need to make sure we
pass it all information on where to jump to in HSRR registers.

Unfortunately, we used r10 to store the information to distinguish between
the HSRR and SRR case. That register got clobbered in between though,
rendering the later comparison invalid.

Instead, let's use cr1 to store this information. That way we don't
need yet another register and everyone's happy.

This fixes PR KVM on POWER7 bare metal for me.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/kvm/book3s_segment.S |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

Patch

diff --git a/arch/powerpc/kvm/book3s_segment.S b/arch/powerpc/kvm/book3s_segment.S
index 87cfc1d..6e6e9ce 100644
--- a/arch/powerpc/kvm/book3s_segment.S
+++ b/arch/powerpc/kvm/book3s_segment.S
@@ -197,8 +197,8 @@  kvmppc_interrupt:
 	/* Save guest PC and MSR */
 #ifdef CONFIG_PPC64
 BEGIN_FTR_SECTION
-	mr	r10, r12
-	andi.	r0,r12,0x2
+	andi.	r0, r12, 0x2
+	cmpwi	cr1, r0, 0
 	beq	1f
 	mfspr	r3,SPRN_HSRR0
 	mfspr	r4,SPRN_HSRR1
@@ -345,8 +345,7 @@  no_dcbz32_off:
 
 #ifdef CONFIG_PPC64
 BEGIN_FTR_SECTION
-	andi.	r0,r10,0x2
-	beq	1f
+	beq	cr1, 1f
 	mtspr	SPRN_HSRR1, r6
 	mtspr	SPRN_HSRR0, r8
 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)