* [PATCH] powerpc/kvm: Fix guest boot issue DAWR cpu feature
@ 2018-03-30 11:57 Aneesh Kumar K.V
2018-03-31 14:04 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Aneesh Kumar K.V @ 2018-03-30 11:57 UTC (permalink / raw)
To: benh, paulus, mpe, Michael Neuling; +Cc: linuxppc-dev, Aneesh Kumar K.V
SLOF check the 'sc 1' support by issuing a hcall with H_SET_DABR. With
recent patch to make the hcall return H_UNSUPPORTED, we get guest boot
failures. SLOF can work with the hcall failure H_HARDWARE for the above
hcall. Switch the return value to H_HARDWARE instead of H_UNSUPPORTED so that
we don't break the guest boot.
Fixes: e8ebedbf ("KVM: PPC: Book3S HV: Return error from h_set_dabr() on POWER9")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index c4c1b169826a..fdd7350d6c87 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -2576,7 +2576,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
2:
BEGIN_FTR_SECTION
/* POWER9 with disabled DAWR */
- li r3, H_UNSUPPORTED
+ li r3, H_HARDWARE
blr
END_FTR_SECTION_IFCLR(CPU_FTR_DAWR)
/* Emulate H_SET_DABR/X on P8 for the sake of compat mode guests */
--
2.14.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: powerpc/kvm: Fix guest boot issue DAWR cpu feature
2018-03-30 11:57 [PATCH] powerpc/kvm: Fix guest boot issue DAWR cpu feature Aneesh Kumar K.V
@ 2018-03-31 14:04 ` Michael Ellerman
0 siblings, 0 replies; 2+ messages in thread
From: Michael Ellerman @ 2018-03-31 14:04 UTC (permalink / raw)
To: Aneesh Kumar K.V, benh, paulus, Michael Neuling
Cc: Aneesh Kumar K.V, linuxppc-dev
On Fri, 2018-03-30 at 11:57:24 UTC, "Aneesh Kumar K.V" wrote:
> SLOF check the 'sc 1' support by issuing a hcall with H_SET_DABR. With
> recent patch to make the hcall return H_UNSUPPORTED, we get guest boot
> failures. SLOF can work with the hcall failure H_HARDWARE for the above
> hcall. Switch the return value to H_HARDWARE instead of H_UNSUPPORTED so that
> we don't break the guest boot.
>
> Fixes: e8ebedbf ("KVM: PPC: Book3S HV: Return error from h_set_dabr() on POWER9")
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/ca9a16c3bc1582da62ef9c47fc2200
cheers
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2018-03-31 14:04 ` Michael Ellerman
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