From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93B86C43381 for ; Mon, 1 Apr 2019 08:51:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E6CB20828 for ; Mon, 1 Apr 2019 08:51:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728007AbfDAIvD (ORCPT ); Mon, 1 Apr 2019 04:51:03 -0400 Received: from mail-wm1-f66.google.com ([209.85.128.66]:50781 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726637AbfDAIvC (ORCPT ); Mon, 1 Apr 2019 04:51:02 -0400 Received: by mail-wm1-f66.google.com with SMTP id z11so9511406wmi.0 for ; Mon, 01 Apr 2019 01:51:00 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version; bh=uLmSmos+VfbRw6RvrGeNTGCyKyv3dmO8Id/z0iVFb9U=; b=lng66LLWGii5QLTkxDpMLyONum8d3zRX6A/Y51AN41XR9U1ZHuNFZPj4kkKZzk67r0 +z802ZjN81KjaikmB5rptTtt89xUMe6c1wHn2irg5ASJgH/UT2L2wNXldNCC0VFuPm4+ qOCfQ/9cAcwIvB/6xNhABxwMf562XxHorIiCBbak5QdbcT0QeaX1oNS8Mea5/Nkyj9p9 QWGN7xC4sVNK2zaxyMOplKaahGXTnQu72c23Yz34OFs+iSyGIaylUNZpPlaMSqbMI9hr SvwAMmbPGnAOAFbzED8/GATrsEiZjLMJGXS7k51K0eykVi0TmkBQKeclbItV8iSQpe34 SU+A== X-Gm-Message-State: APjAAAU38nPJVLf1v3oBgt2gGVhjSeWoa9dofh4r6Pz0hGRcqOIAPfhS YqnqwEjFyiuUUaExQ3FZX4QsBfxtz0Q= X-Google-Smtp-Source: APXvYqwVD+HZwsvphM+aJAnG7kckV8vMwFx078tn1GlydGHC2oXAHUfT2onO16pTj41wq+YjL/2FAw== X-Received: by 2002:a05:600c:2309:: with SMTP id 9mr12108240wmo.52.1554108659648; Mon, 01 Apr 2019 01:50:59 -0700 (PDT) Received: from vitty.brq.redhat.com (nat-pool-brq-t.redhat.com. [213.175.37.10]) by smtp.gmail.com with ESMTPSA id t15sm14162778wmt.2.2019.04.01.01.50.58 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 01 Apr 2019 01:50:58 -0700 (PDT) From: Vitaly Kuznetsov To: Paolo Bonzini , kvm@vger.kernel.org Cc: Radim =?utf-8?B?S3LEjW3DocWZ?= , Liran Alon , Sean Christopherson , linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] KVM: x86: vmx: throttle immediate exit through preemtion timer to assist buggy guests In-Reply-To: <89d4189b-de6a-7634-de8b-29a044a86e12@redhat.com> References: <20190328203110.20655-1-vkuznets@redhat.com> <87d0m93frp.fsf@vitty.brq.redhat.com> <89d4189b-de6a-7634-de8b-29a044a86e12@redhat.com> Date: Mon, 01 Apr 2019 10:50:57 +0200 Message-ID: <87sgv2153i.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Paolo Bonzini writes: > > IIRC there was an enlightenment to tell Windows "I support auto-EOI but > please don't use it". If this is what's happening, that would also fix it. > Unfortunately this doesn't save the day, Hyper-V behaves the same. I'm more and move convinced that the secord IRQ was completely unrelated: [011] 515003.517644: kvm_exit: reason EPT_MISCONFIG rip 0xfffff80ca6bf1a5e info 0 0 [011] 515003.517645: kvm_nested_vmexit: rip fffff80ca6bf1a5e reason EPT_MISCONFIG info1 0 info2 0 int_info 0 int_info_err 0 [011] 515003.517649: kvm_emulate_insn: 0:fffff80ca6bf1a5e: 8b 08 [011] 515003.517652: vcpu_match_mmio: gva 0xffffd300eb0a8008 gpa 0x91044008 Read GPA [011] 515003.517653: kvm_mmio: mmio unsatisfied-read len 4 gpa 0x91044008 val 0x0 [011] 515003.517654: kvm_fpu: unload [011] 515003.517655: kvm_userspace_exit: reason KVM_EXIT_MMIO (6) -> injecting [007] 515003.517664: kvm_set_irq: gsi 23 level 1 source 0 [007] 515003.517666: kvm_msi_set_irq: dst 0 vec 80 (Fixed|physical|level) [007] 515003.517667: kvm_apic_accept_irq: apicid 0 vec 80 (Fixed|edge) [011] 515003.517688: kvm_fpu: load [011] 515003.517689: kvm_mmio: mmio read len 4 gpa 0x91044008 val 0x1 [011] 515003.517692: kvm_nested_vmexit_inject: reason EXTERNAL_INTERRUPT info1 0 info2 0 int_info 80000050 int_info_err 0 [011] 515003.517696: kvm_entry: vcpu 0 -> immediate EOI [011] 515003.517702: kvm_exit: reason EOI_INDUCED rip 0xfffff80002427e1a info 50 0 [011] 515003.517703: kvm_eoi: apicid 0 vector 80 [011] 515003.517704: kvm_fpu: unload [011] 515003.517705: kvm_userspace_exit: reason KVM_EXIT_IOAPIC_EOI (26) [011] 515003.517710: kvm_set_irq: gsi 23 level 1 source 0 [011] 515003.517711: kvm_msi_set_irq: dst 0 vec 80 (Fixed|physical|level) [011] 515003.517712: kvm_apic_accept_irq: apicid 0 vec 80 (Fixed|edge) [011] 515003.517714: kvm_fpu: load [011] 515003.517716: kvm_entry: vcpu 0 [011] 515003.517720: kvm_exit: reason VMRESUME rip 0xfffff80002450115 info 0 0 [011] 515003.517726: kvm_entry: vcpu 0 [011] 515003.517729: kvm_exit: reason PREEMPTION_TIMER rip 0xfffff80ca6bf1a60 info 0 0 [011] 515003.517730: kvm_nested_vmexit: rip fffff80ca6bf1a60 reason PREEMPTION_TIMER info1 0 info2 0 int_info 0 int_info_err 0 [011] 515003.517732: kvm_nested_vmexit_inject: reason EXTERNAL_INTERRUPT info1 0 info2 0 int_info 80000050 int_info_err 0 [011] 515003.517735: kvm_entry: vcpu 0 [011] 515003.517739: kvm_exit: reason EOI_INDUCED rip 0xfffff80002427e1a info 50 0 [011] 515003.517739: kvm_eoi: apicid 0 vector 80 [011] 515003.517740: kvm_fpu: unload [011] 515003.517741: kvm_userspace_exit: reason KVM_EXIT_IOAPIC_EOI (26) [011] 515003.517743: kvm_set_irq: gsi 23 level 1 source 0 [011] 515003.517744: kvm_msi_set_irq: dst 0 vec 80 (Fixed|physical|level) [011] 515003.517744: kvm_apic_accept_irq: apicid 0 vec 80 (Fixed|edge) [011] 515003.517746: kvm_fpu: load [011] 515003.517747: kvm_entry: vcpu 0 [011] 515003.517751: kvm_exit: reason VMRESUME rip 0xfffff80002450115 info 0 0 ... -- Vitaly