[PATCH] KVM: Use kmalloc() instead of vmalloc() for KVM_[GS]ET_MSR

Avi Kivity
2010-07-23T06:02:16Z

We don't need more than a page, and vmalloc() is slower (much
slower recently due to a regression).

Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/kvm/x86.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 84bfb51..76fbc32 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1626,7 +1626,7 @@ static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,

r = -ENOMEM;
size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
- entries = vmalloc(size);
+ entries = kmalloc(size, GFP_KERNEL);
if (!entries)
goto out;

@@ -1645,7 +1645,7 @@ static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
r = n;

out_free:
- vfree(entries);
+ kfree(entries);
out:
return r;
}
--
1.7.1