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[PATCH] KVM: VMX: add vcpu_clear()

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Like the inline code it replaces, this function decaches the vmcs from the cpu
it last executed on.  in addition:

 - vcpu_clear() works if the last cpu is also the cpu we're running on
 - it is faster on larger smps by virtue of using smp_call_function_single()

Includes fix from Ingo Molnar.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Avi Kivity 2007-02-12 00:54:46 -08:00 committed by Linus Torvalds
parent 133de9021d
commit 8d0be2b3bf
1 changed files with 11 additions and 4 deletions
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15
drivers/kvm/vmx.c
View file

@ -125,6 +125,15 @@ static void __vcpu_clear(void *arg)
per_cpu(current_vmcs, cpu) = NULL;
}
static void vcpu_clear(struct kvm_vcpu *vcpu)
{
if (vcpu->cpu != raw_smp_processor_id() && vcpu->cpu != -1)
smp_call_function_single(vcpu->cpu, __vcpu_clear, vcpu, 0, 1);
else
__vcpu_clear(vcpu);
vcpu->launched = 0;
}
static unsigned long vmcs_readl(unsigned long field)
{
unsigned long value;
@ -202,10 +211,8 @@ static struct kvm_vcpu *vmx_vcpu_load(struct kvm_vcpu *vcpu)
cpu = get_cpu();
if (vcpu->cpu != cpu) {
smp_call_function(__vcpu_clear, vcpu, 0, 1);
vcpu->launched = 0;
}
if (vcpu->cpu != cpu)
vcpu_clear(vcpu);
if (per_cpu(current_vmcs, cpu) != vcpu->vmcs) {
u8 error;