From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 9D3926007D6 for ; Tue, 5 Jan 2010 09:13:14 -0500 (EST) From: Gleb Natapov Subject: [PATCH v3 03/12] Add async PF initialization to PV guest. Date: Tue, 5 Jan 2010 16:12:45 +0200 Message-Id: <1262700774-1808-4-git-send-email-gleb@redhat.com> In-Reply-To: <1262700774-1808-1-git-send-email-gleb@redhat.com> References: <1262700774-1808-1-git-send-email-gleb@redhat.com> Sender: owner-linux-mm@kvack.org To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, avi@redhat.com, mingo@elte.hu, a.p.zijlstra@chello.nl, tglx@linutronix.de, hpa@zytor.com, riel@redhat.com, cl@linux-foundation.org List-ID: Signed-off-by: Gleb Natapov --- 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 f77eed3..56ca41b 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -51,6 +51,11 @@ struct kvm_mmu_op_release_pt { __u64 pt_phys; }; +struct kvm_vcpu_pv_apf_data { + __u32 reason; + __u32 enabled; +}; + #ifdef __KERNEL__ #include diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index e6db179..001222c 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -27,7 +27,10 @@ #include #include #include +#include +#include #include +#include #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_ALIGNED(struct kvm_vcpu_pv_apf_data, apf_reason); 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 678d0b8..0a9eef4 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -65,6 +65,7 @@ #include #include #include +#include #include @@ -321,6 +322,8 @@ notrace static void __cpuinit start_secondary(void *unused) ipi_call_unlock(); per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; + 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) -- 1.6.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org