From: Gleb Natapov <gleb@redhat.com> 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 Subject: [PATCH v3 11/12] Let host know whether the guest can handle async PF in non-userspace context. Date: Tue, 5 Jan 2010 16:12:53 +0200 [thread overview] Message-ID: <1262700774-1808-12-git-send-email-gleb@redhat.com> (raw) In-Reply-To: <1262700774-1808-1-git-send-email-gleb@redhat.com> If guest can detect that it runs in non-preemptable context it can handle async PFs at any time, so let host know that it can send async PF even if guest cpu is not in userspace. Signed-off-by: Gleb Natapov <gleb@redhat.com> --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/include/asm/kvm_para.h | 1 + arch/x86/kernel/kvm.c | 3 +++ arch/x86/kvm/x86.c | 5 +++-- 4 files changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 43c1aca..cb0fd75 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -365,6 +365,7 @@ struct kvm_vcpu_arch { unsigned long singlestep_rip; u32 __user *apf_data; + bool apf_send_user_only; u32 apf_memslot_ver; u64 apf_msr_val; u32 async_pf_id; diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h index 98edaa9..8a18560 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -24,6 +24,7 @@ #define KVM_MAX_MMU_OP_BATCH 32 #define KVM_ASYNC_PF_ENABLED (1 << 0) +#define KVM_ASYNC_PF_SEND_ALWAYS (1 << 1) /* Operations for KVM_HC_MMU_OP */ #define KVM_MMU_OP_WRITE_PTE 1 diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 49549fd..4241706 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -480,6 +480,9 @@ void __cpuinit kvm_guest_cpu_init(void) if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF)) { u64 pa = __pa(&__get_cpu_var(apf_reason)); +#ifdef CONFIG_PREEMPT + pa |= KVM_ASYNC_PF_SEND_ALWAYS; +#endif if (native_write_msr_safe(MSR_KVM_ASYNC_PF_EN, pa | KVM_ASYNC_PF_ENABLED, pa >> 32)) return; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e2e33ac..47f1661 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1009,8 +1009,8 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) int offset = offset_in_page(gpa); unsigned long addr; - /* Bits 1:5 are resrved, Should be zero */ - if (data & 0x3e) + /* Bits 2:5 are resrved, Should be zero */ + if (data & 0x3c) return 1; vcpu->arch.apf_msr_val = data; @@ -1032,6 +1032,7 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) return 1; } vcpu->arch.apf_memslot_ver = vcpu->kvm->memslot_version; + vcpu->arch.apf_send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); kvm_async_pf_wakeup_all(vcpu); return 0; } -- 1.6.5
WARNING: multiple messages have this Message-ID (diff)
From: Gleb Natapov <gleb@redhat.com> 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 Subject: [PATCH v3 11/12] Let host know whether the guest can handle async PF in non-userspace context. Date: Tue, 5 Jan 2010 16:12:53 +0200 [thread overview] Message-ID: <1262700774-1808-12-git-send-email-gleb@redhat.com> (raw) In-Reply-To: <1262700774-1808-1-git-send-email-gleb@redhat.com> If guest can detect that it runs in non-preemptable context it can handle async PFs at any time, so let host know that it can send async PF even if guest cpu is not in userspace. Signed-off-by: Gleb Natapov <gleb@redhat.com> --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/include/asm/kvm_para.h | 1 + arch/x86/kernel/kvm.c | 3 +++ arch/x86/kvm/x86.c | 5 +++-- 4 files changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 43c1aca..cb0fd75 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -365,6 +365,7 @@ struct kvm_vcpu_arch { unsigned long singlestep_rip; u32 __user *apf_data; + bool apf_send_user_only; u32 apf_memslot_ver; u64 apf_msr_val; u32 async_pf_id; diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h index 98edaa9..8a18560 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -24,6 +24,7 @@ #define KVM_MAX_MMU_OP_BATCH 32 #define KVM_ASYNC_PF_ENABLED (1 << 0) +#define KVM_ASYNC_PF_SEND_ALWAYS (1 << 1) /* Operations for KVM_HC_MMU_OP */ #define KVM_MMU_OP_WRITE_PTE 1 diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 49549fd..4241706 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -480,6 +480,9 @@ void __cpuinit kvm_guest_cpu_init(void) if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF)) { u64 pa = __pa(&__get_cpu_var(apf_reason)); +#ifdef CONFIG_PREEMPT + pa |= KVM_ASYNC_PF_SEND_ALWAYS; +#endif if (native_write_msr_safe(MSR_KVM_ASYNC_PF_EN, pa | KVM_ASYNC_PF_ENABLED, pa >> 32)) return; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e2e33ac..47f1661 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1009,8 +1009,8 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) int offset = offset_in_page(gpa); unsigned long addr; - /* Bits 1:5 are resrved, Should be zero */ - if (data & 0x3e) + /* Bits 2:5 are resrved, Should be zero */ + if (data & 0x3c) return 1; vcpu->arch.apf_msr_val = data; @@ -1032,6 +1032,7 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) return 1; } vcpu->arch.apf_memslot_ver = vcpu->kvm->memslot_version; + vcpu->arch.apf_send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); kvm_async_pf_wakeup_all(vcpu); return 0; } -- 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-01-05 14:13 UTC|newest] Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-01-05 14:12 [PATCH v3 00/12] KVM: Add host swap event notifications for PV guest Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 01/12] Move kvm_smp_prepare_boot_cpu() from kvmclock.c to kvm.c Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 02/12] Add PV MSR to enable asynchronous page faults delivery Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-06 9:57 ` [Qemu-devel] Fw: " Dor Laor 2010-01-06 10:04 ` [Qemu-devel] " Gleb Natapov 2010-01-06 10:28 ` Gerd Hoffmann 2010-01-06 13:20 ` Anthony Liguori 2010-01-05 14:12 ` [PATCH v3 03/12] Add async PF initialization to PV guest Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 04/12] Add "handle page fault" PV helper Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-14 17:31 ` Peter Zijlstra 2010-01-14 17:31 ` Peter Zijlstra 2010-01-14 17:31 ` Peter Zijlstra 2010-01-17 14:44 ` Gleb Natapov 2010-01-17 14:44 ` Gleb Natapov 2010-01-17 15:09 ` Peter Zijlstra 2010-01-17 15:09 ` Peter Zijlstra 2010-01-17 15:09 ` Peter Zijlstra 2010-01-17 15:12 ` Gleb Natapov 2010-01-17 15:12 ` Gleb Natapov 2010-01-18 9:53 ` Andi Kleen 2010-01-18 9:53 ` Andi Kleen 2010-01-18 9:53 ` Andi Kleen 2010-01-18 8:34 ` H. Peter Anvin 2010-01-18 8:34 ` H. Peter Anvin 2010-01-18 8:50 ` Gleb Natapov 2010-01-18 8:50 ` Gleb Natapov 2010-01-19 1:53 ` H. Peter Anvin 2010-01-19 1:53 ` H. Peter Anvin 2010-01-19 6:55 ` Gleb Natapov 2010-01-19 6:55 ` Gleb Natapov 2010-01-19 17:03 ` H. Peter Anvin 2010-01-19 17:03 ` H. Peter Anvin 2010-01-19 17:44 ` Gleb Natapov 2010-01-19 17:44 ` Gleb Natapov 2010-01-19 20:10 ` H. Peter Anvin 2010-01-19 20:10 ` H. Peter Anvin 2010-01-20 10:02 ` Gleb Natapov 2010-01-20 10:02 ` Gleb Natapov 2010-01-20 12:00 ` Avi Kivity 2010-01-20 12:00 ` Avi Kivity 2010-01-20 17:18 ` Rik van Riel 2010-01-20 17:18 ` Rik van Riel 2010-01-21 8:56 ` Avi Kivity 2010-01-21 8:56 ` Avi Kivity 2010-01-20 18:45 ` H. Peter Anvin 2010-01-20 18:45 ` H. Peter Anvin 2010-01-21 8:58 ` Avi Kivity 2010-01-21 8:58 ` Avi Kivity 2010-01-20 17:43 ` H. Peter Anvin 2010-01-20 17:43 ` H. Peter Anvin 2010-01-21 9:02 ` Avi Kivity 2010-01-21 9:02 ` Avi Kivity 2010-01-21 9:04 ` Gleb Natapov 2010-01-21 9:04 ` Gleb Natapov 2010-01-21 9:05 ` Avi Kivity 2010-01-21 9:05 ` Avi Kivity 2010-01-21 15:47 ` H. Peter Anvin 2010-01-21 15:47 ` H. Peter Anvin 2010-01-22 7:25 ` Gleb Natapov 2010-01-22 7:25 ` Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 05/12] Export __get_user_pages_fast Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-17 15:46 ` Christoph Hellwig 2010-01-17 15:46 ` Christoph Hellwig 2010-01-05 14:12 ` [PATCH v3 06/12] Add get_user_pages() variant that fails if major fault is required Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-17 15:43 ` Christoph Hellwig 2010-01-17 15:43 ` Christoph Hellwig 2010-01-05 14:12 ` [PATCH v3 07/12] Maintain memslot version number Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 08/12] Inject asynchronous page fault into a guest if page is swapped out Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 09/12] Retry fault before vmentry Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 10/12] Handle async PF in non preemptable context Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov [this message] 2010-01-05 14:12 ` [PATCH v3 11/12] Let host know whether the guest can handle async PF in non-userspace context Gleb Natapov 2010-01-05 14:12 ` [PATCH v3 12/12] Send async PF when guest is not in userspace too Gleb Natapov 2010-01-05 14:12 ` Gleb Natapov 2010-01-05 15:05 ` [PATCH v3 00/12] KVM: Add host swap event notifications for PV guest Jun Koi 2010-01-05 15:05 ` Jun Koi 2010-01-05 15:59 ` Rik van Riel 2010-01-05 15:59 ` Rik van Riel 2010-01-05 16:04 ` Avi Kivity 2010-01-05 16:04 ` Avi Kivity 2010-01-06 10:17 ` Jun Koi 2010-01-06 10:17 ` Jun Koi 2010-01-06 10:21 ` Gleb Natapov 2010-01-06 10:21 ` Gleb Natapov 2010-01-08 16:18 ` Marcelo Tosatti 2010-01-08 16:18 ` Marcelo Tosatti 2010-01-08 16:47 ` Gleb Natapov 2010-01-08 16:47 ` Gleb Natapov 2010-01-08 19:24 ` Rik van Riel 2010-01-08 19:24 ` Rik van Riel 2010-01-08 19:30 ` Bryan Donlan 2010-01-08 19:30 ` Bryan Donlan 2010-01-08 19:55 ` Rik van Riel 2010-01-08 19:55 ` Rik van Riel
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