Re: [PATCH v5 03/12] Add async PF initialization to PV guest.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



 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

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxxx  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>


[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]