[PATCH] KVM: cpu hotplug support

On hotplug, we execute the hardware extension enable sequence.  On unplug, we
decache any vcpus that last ran on the exiting cpu, and execute the hardware
extension disable sequence.

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>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 28da0cae64a7..1e640b899175 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -250,6 +250,11 @@ static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
         put_cpu();
 }
 
+static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
+{
+        vcpu_clear(vcpu);
+}
+
 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
 {
         return vmcs_readl(GUEST_RFLAGS);
@@ -509,7 +514,7 @@ static __init int vmx_disabled_by_bios(void)
         return (msr & 5) == 1; /* locked but not enabled */
 }
 
-static __init void hardware_enable(void *garbage)
+static void hardware_enable(void *garbage)
 {
         int cpu = raw_smp_processor_id();
         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
@@ -2023,6 +2028,7 @@ static struct kvm_arch_ops vmx_arch_ops = {
 
         .vcpu_load = vmx_vcpu_load,
         .vcpu_put = vmx_vcpu_put,
+        .vcpu_decache = vmx_vcpu_decache,
 
         .set_guest_debug = set_guest_debug,
         .get_msr = vmx_get_msr,