From: Alexander Graf <agraf@suse.de>
To: kvm-ppc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, Paul Mackerras <paulus@ozlabs.org>
Subject: [PATCH] KVM: PPC: Book3S HV: Remove vcpu->arch.dec usage
Date: Tue, 19 Dec 2017 15:56:24 +0100 [thread overview]
Message-ID: <20171219145624.46724-1-agraf@suse.de> (raw)
On Book3S in HV mode, we don't use the vcpu->arch.dec field at all.
Instead, all logic is built around vcpu->arch.dec_expires.
So let's remove the one remaining piece of code that was setting it.
Signed-off-by: Alexander Graf <agraf@suse.de>
---
Looking through the DEC logic, I fail to see any code that allows
save or restore of DEC. Do we maybe miss out on that register for
(live) migration?
---
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 2659844784b8..c8ffd69adfec 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -957,7 +957,6 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300)
mftb r7
subf r3,r7,r8
mtspr SPRN_DEC,r3
- std r3,VCPU_DEC(r4)
ld r5, VCPU_SPRG0(r4)
ld r6, VCPU_SPRG1(r4)
--
2.12.3
next reply other threads:[~2017-12-19 14:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-19 14:56 Alexander Graf [this message]
2018-01-11 10:01 ` Paul Mackerras
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