Thread (37 messages) 37 messages, 2 authors, 2010-09-01
STALE5764d

[PATCH 27/35] KVM: PPC: Enable napping only for Book3s_64

From: Alexander Graf <hidden>
Date: 2010-08-31 02:32:22
Also in: kvm
Subsystem: kernel virtual machine for powerpc (kvm/powerpc), linux for powerpc (32-bit and 64-bit), the rest · Maintainers: Madhavan Srinivasan, Michael Ellerman, Linus Torvalds

Before I incorrectly enabled napping also for BookE, which would result in
needless dcache flushes. Since we only need to force enable napping on
Book3s_64 because it doesn't go into MSR_POW otherwise, we can just #ifdef
that code to this particular platform.

Reported-by: Scott Wood <redacted>
Signed-off-by: Alexander Graf <redacted>
---
 arch/powerpc/kernel/kvm.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 95aed6b..293765a 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -583,8 +583,10 @@ static int __init kvm_guest_init(void)
 	if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE))
 		kvm_use_magic_page();
 
+#ifdef CONFIG_PPC_BOOK3S_64
 	/* Enable napping */
 	powersave_nap = 1;
+#endif
 
 free_tmp:
 	kvm_free_tmp();
-- 
1.6.0.2
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