On 07/19/2010 06:30 PM, Gleb Natapov wrote:
Enable async PF in a guest if async PF capability is discovered.
Signed-off-by: Gleb Natapov<gleb@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_para.h | 5 +++
arch/x86/kernel/kvm.c | 68 +++++++++++++++++++++++++++++++++++++++
2 files changed, 73 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 5b05e9f..f1662d7 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -65,6 +65,11 @@ struct kvm_mmu_op_release_pt {
__u64 pt_phys;
};
+struct kvm_vcpu_pv_apf_data {
+ __u32 reason;
+ __u32 enabled;
+};
+
The guest will have to align this on a 64 byte boundary, should this be
marked __aligned(64) here?
@@ -231,12 +235,72 @@ static void __init paravirt_ops_setup(void)
#endif
}
+void __cpuinit kvm_guest_cpu_init(void)
+{
+ if (!kvm_para_available())
+ return;
+
+ if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF)) {
+ u64 pa = __pa(&__get_cpu_var(apf_reason));
+
+ if (native_write_msr_safe(MSR_KVM_ASYNC_PF_EN,
+ pa | KVM_ASYNC_PF_ENABLED, pa>> 32))
+ return;
+ __get_cpu_var(apf_reason).enabled = 1;
+ printk(KERN_INFO"KVM setup async PF for cpu %d\n",
+ smp_processor_id());
+ }
+}
Need a way to disable apf from the guest kernel command line.
+
+static int __cpuinit kvm_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ kvm_guest_cpu_init();
+ break;
+ default:
+ break;
Should we disable apf if the cpu is dying here?
+ }
+ return NOTIFY_OK;
+}
+
--
error compiling committee.c: too many arguments to function
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