From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot0-f200.google.com (mail-ot0-f200.google.com [74.125.82.200]) by kanga.kvack.org (Postfix) with ESMTP id 97B2B6B031E for ; Tue, 5 Dec 2017 21:32:11 -0500 (EST) Received: by mail-ot0-f200.google.com with SMTP id h12so1209749oti.8 for ; Tue, 05 Dec 2017 18:32:11 -0800 (PST) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id p4sor538838oie.95.2017.12.05.18.32.10 for (Google Transport Security); Tue, 05 Dec 2017 18:32:10 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20171130180546.4331-1-rkrcmar@redhat.com> References: <20171130161933.GB1606@flask> <20171130180546.4331-1-rkrcmar@redhat.com> From: Wanpeng Li Date: Wed, 6 Dec 2017 10:32:09 +0800 Message-ID: Subject: Re: [PATCH 1/2] KVM: x86: fix APIC page invalidation Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org List-ID: To: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= Cc: =?UTF-8?Q?Fabian_Gr=C3=BCnbichler?= , "linux-kernel@vger.kernel.org" , linux-mm , kvm , Paolo Bonzini , Andrea Arcangeli , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= 2017-12-01 2:05 GMT+08:00 Radim Kr=C4=8Dm=C3=A1=C5=99 : > Implementation of the unpinned APIC page didn't update the VMCS address > cache when invalidation was done through range mmu notifiers. > This became a problem when the page notifier was removed. > > Re-introduce the arch-specific helper and call it from ...range_start. > > Fixes: 38b9917350cb ("kvm: vmx: Implement set_apic_access_page_addr") > Fixes: 369ea8242c0f ("mm/rmap: update to new mmu_notifier semantic v2") > Signed-off-by: Radim Kr=C4=8Dm=C3=A1=C5=99 Tested-by: Wanpeng Li I observe the windows 2016 guest hang during boot on a heavy memory overcommit host, and this commit fixes it. Regards, Wanpeng Li > --- > arch/x86/include/asm/kvm_host.h | 3 +++ > arch/x86/kvm/x86.c | 14 ++++++++++++++ > virt/kvm/kvm_main.c | 8 ++++++++ > 3 files changed, 25 insertions(+) > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_h= ost.h > index 977de5fb968b..c16c3f924863 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -1435,4 +1435,7 @@ static inline int kvm_cpu_get_apicid(int mps_cpu) > #define put_smstate(type, buf, offset, val) \ > *(type *)((buf) + (offset) - 0x7e00) =3D val > > +void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, > + unsigned long start, unsigned long end); > + > #endif /* _ASM_X86_KVM_HOST_H */ > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index eee8e7faf1af..a219974cdb89 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -6778,6 +6778,20 @@ static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vc= pu) > kvm_x86_ops->tlb_flush(vcpu); > } > > +void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, > + unsigned long start, unsigned long end) > +{ > + unsigned long apic_address; > + > + /* > + * The physical address of apic access page is stored in the VMCS= . > + * Update it when it becomes invalid. > + */ > + apic_address =3D gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_S= HIFT); > + if (start <=3D apic_address && apic_address < end) > + kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD); > +} > + > void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu) > { > struct page *page =3D NULL; > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index c01cff064ec5..b7f4689e373f 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -135,6 +135,11 @@ static void kvm_uevent_notify_change(unsigned int ty= pe, struct kvm *kvm); > static unsigned long long kvm_createvm_count; > static unsigned long long kvm_active_vms; > > +__weak void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, > + unsigned long start, unsigned long end) > +{ > +} > + > bool kvm_is_reserved_pfn(kvm_pfn_t pfn) > { > if (pfn_valid(pfn)) > @@ -360,6 +365,9 @@ static void kvm_mmu_notifier_invalidate_range_start(s= truct mmu_notifier *mn, > kvm_flush_remote_tlbs(kvm); > > spin_unlock(&kvm->mmu_lock); > + > + kvm_arch_mmu_notifier_invalidate_range(kvm, start, end); > + > srcu_read_unlock(&kvm->srcu, idx); > } > > -- > 2.14.2 > > -- > 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 -- 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