Patchwork [21/35] KVM: PPC: Force enable nap on KVM

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Submitter Alexander Graf
Date Aug. 31, 2010, 2:32 a.m.
Message ID <1283221937-21006-22-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/63168/
State Not Applicable
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Comments

Alexander Graf - Aug. 31, 2010, 2:32 a.m.
There are some heuristics in the PPC power management code that try to find
out if the particular hardware we're running on supports proper power management
or just hangs the machine when going into nap mode.

Since we know that KVM is safe with nap, let's force enable it in the PV code
once we're certain that we are on a KVM VM.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/kernel/kvm.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 517da39..95aed6b 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -583,6 +583,9 @@  static int __init kvm_guest_init(void)
 	if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE))
 		kvm_use_magic_page();
 
+	/* Enable napping */
+	powersave_nap = 1;
+
 free_tmp:
 	kvm_free_tmp();