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Message-Id: <1278433500-29884-4-git-send-email-gleb@redhat.com>
Date: Tue, 6 Jul 2010 19:24:51 +0300
From: Gleb Natapov <gleb@...hat.com>
To: kvm@...r.kernel.org
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, avi@...hat.com,
mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
hpa@...or.com, riel@...hat.com, cl@...ux-foundation.org,
mtosatti@...hat.com
Subject: [PATCH v4 03/12] Add async PF initialization to PV guest.
Signed-off-by: Gleb Natapov <gleb@...hat.com>
---
arch/x86/include/asm/kvm_para.h | 5 ++++
arch/x86/kernel/kvm.c | 49 +++++++++++++++++++++++++++++++++++++++
arch/x86/kernel/smpboot.c | 3 ++
include/linux/kvm_para.h | 2 +
4 files changed, 59 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;
+};
+
#ifdef __KERNEL__
#include <asm/processor.h>
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index e6db179..be1966a 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -27,7 +27,10 @@
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/hardirq.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
#include <asm/timer.h>
+#include <asm/cpu.h>
#define MMU_QUEUE_SIZE 1024
@@ -37,6 +40,7 @@ struct kvm_para_state {
};
static DEFINE_PER_CPU(struct kvm_para_state, para_state);
+static DEFINE_PER_CPU(struct kvm_vcpu_pv_apf_data, apf_reason) __aligned(64);
static struct kvm_para_state *kvm_para_state(void)
{
@@ -231,10 +235,35 @@ static void __init paravirt_ops_setup(void)
#endif
}
+static void kvm_pv_disable_apf(void *unused)
+{
+ if (!__get_cpu_var(apf_reason).enabled)
+ return;
+
+ wrmsrl(MSR_KVM_ASYNC_PF_EN, 0);
+ __get_cpu_var(apf_reason).enabled = 0;
+
+ printk(KERN_INFO"Unregister pv shared memory for cpu %d\n",
+ smp_processor_id());
+}
+
+static int kvm_pv_reboot_notify(struct notifier_block *nb,
+ unsigned long code, void *unused)
+{
+ if (code == SYS_RESTART)
+ on_each_cpu(kvm_pv_disable_apf, NULL, 1);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block kvm_pv_reboot_nb = {
+ .notifier_call = kvm_pv_reboot_notify,
+};
+
#ifdef CONFIG_SMP
static void __init kvm_smp_prepare_boot_cpu(void)
{
WARN_ON(kvm_register_clock("primary cpu clock"));
+ kvm_guest_cpu_init();
native_smp_prepare_boot_cpu();
}
#endif
@@ -245,7 +274,27 @@ void __init kvm_guest_init(void)
return;
paravirt_ops_setup();
+ register_reboot_notifier(&kvm_pv_reboot_nb);
#ifdef CONFIG_SMP
smp_ops.smp_prepare_boot_cpu = kvm_smp_prepare_boot_cpu;
+#else
+ kvm_guest_cpu_init();
#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"Setup pv shared memory for cpu %d\n",
+ smp_processor_id());
+ }
+}
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c4f33b2..b70e872 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -67,6 +67,7 @@
#include <asm/setup.h>
#include <asm/uv/uv.h>
#include <linux/mc146818rtc.h>
+#include <linux/kvm_para.h>
#include <asm/smpboot_hooks.h>
#include <asm/i8259.h>
@@ -329,6 +330,8 @@ notrace static void __cpuinit start_secondary(void *unused)
per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
x86_platform.nmi_init();
+ kvm_guest_cpu_init();
+
/* enable local interrupts */
local_irq_enable();
diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
index d731092..4c8a2e6 100644
--- a/include/linux/kvm_para.h
+++ b/include/linux/kvm_para.h
@@ -26,8 +26,10 @@
#ifdef __KERNEL__
#ifdef CONFIG_KVM_GUEST
void __init kvm_guest_init(void);
+void __cpuinit kvm_guest_cpu_init(void);
#else
#define kvm_guest_init() do { } while (0)
+#define kvm_guest_cpu_init() do { } while (0)
#endif
static inline int kvm_para_has_feature(unsigned int feature)
--
1.7.1
--
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