KVM: PPC: Book3S HV: Don't set DABR on POWER8

POWER8 doesn't have the DABR and DABRX registers; instead it has
new DAWR/DAWRX registers, which will be handled in a later patch.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 12 insertions, 3 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_interrupts.S b/arch/powerpc/kvm/book3s_hv_interrupts.S
index 928142c64cb0..00b7ed41ea17 100644
--- a/arch/powerpc/kvm/book3s_hv_interrupts.S
+++ b/arch/powerpc/kvm/book3s_hv_interrupts.S
@@ -57,9 +57,11 @@ BEGIN_FTR_SECTION
         std     r3, HSTATE_DSCR(r13)
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
 
+BEGIN_FTR_SECTION
         /* Save host DABR */
         mfspr   r3, SPRN_DABR
         std     r3, HSTATE_DABR(r13)
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
 
         /* Hard-disable interrupts */
         mfmsr   r10
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index acbd1d6afba0..66db71c9156a 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -61,11 +61,13 @@ kvmppc_call_hv_entry:
 
         /* Back from guest - restore host state and return to caller */
 
+BEGIN_FTR_SECTION
         /* Restore host DABR and DABRX */
         ld      r5,HSTATE_DABR(r13)
         li      r6,7
         mtspr   SPRN_DABR,r5
         mtspr   SPRN_DABRX,r6
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
 
         /* Restore SPRG3 */
         ld      r3,PACA_SPRG3(r13)
@@ -284,15 +286,17 @@ kvmppc_hv_entry:
         std     r0, PPC_LR_STKOFF(r1)
         stdu    r1, -112(r1)
 
+BEGIN_FTR_SECTION
         /* Set partition DABR */
         /* Do this before re-enabling PMU to avoid P7 DABR corruption bug */
         li      r5,3
         ld      r6,VCPU_DABR(r4)
         mtspr   SPRN_DABRX,r5
         mtspr   SPRN_DABR,r6
-BEGIN_FTR_SECTION
+ BEGIN_FTR_SECTION_NESTED(89)
         isync
-END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
+ END_FTR_SECTION_NESTED(CPU_FTR_ARCH_206, CPU_FTR_ARCH_206, 89)
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
 
         /* Load guest PMU registers */
         /* R4 is live here (vcpu pointer) */
@@ -1609,6 +1613,9 @@ ignore_hdec:
         b       fast_guest_return
 
 _GLOBAL(kvmppc_h_set_dabr)
+BEGIN_FTR_SECTION
+        b       2f
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
         std     r4,VCPU_DABR(r3)
         /* Work around P7 bug where DABR can get corrupted on mtspr */
 1:      mtspr   SPRN_DABR,r4
@@ -1616,7 +1623,7 @@ _GLOBAL(kvmppc_h_set_dabr)
         cmpd    r4, r5
         bne     1b
         isync
-        li      r3,0
+2:      li      r3,0
         blr
 
 _GLOBAL(kvmppc_h_cede)