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=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 18B11C2BAEE for ; Wed, 11 Mar 2020 19:06:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E194220749 for ; Wed, 11 Mar 2020 19:06:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Kec16bco" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731031AbgCKTGO (ORCPT ); Wed, 11 Mar 2020 15:06:14 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:28464 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730926AbgCKTGN (ORCPT ); Wed, 11 Mar 2020 15:06:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583953572; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=4vRow86Hd2ZBIEcluwNv2v8O/2kX9pz0tfQuIM2Vv3g=; b=Kec16bcokVB9Anpvdc3iFIb9F6IsDPmgridY1UOJ3wWShg8joN7y9UgZGWAJqSVTZ9kyY2 F4n7BuBxvV7hDwHb2e1sWpcbrf4wWB2BnK+GCL5Obfm7WAuRTiSMqcjF1iynHyvQnLmob/ dPogzeCNTa/MNvF+kB1x09KXzCiZAjs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-120--n0kgix7NPSBEl50H2xOWQ-1; Wed, 11 Mar 2020 15:06:07 -0400 X-MC-Unique: -n0kgix7NPSBEl50H2xOWQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7116F1005509; Wed, 11 Mar 2020 19:06:06 +0000 (UTC) Received: from [10.10.120.19] (ovpn-120-19.rdu2.redhat.com [10.10.120.19]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 29D148F364; Wed, 11 Mar 2020 19:06:02 +0000 (UTC) Subject: Re: [Patch v1] KVM: x86: Initializing all kvm_lapic_irq fields To: Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mtosatti@redhat.com, vkuznets@redhat.com, sean.j.christopherson@intel.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org References: <1583951685-202743-1-git-send-email-nitesh@redhat.com> From: Nitesh Narayan Lal Autocrypt: addr=nitesh@redhat.com; prefer-encrypt=mutual; keydata= mQINBFl4pQoBEADT/nXR2JOfsCjDgYmE2qonSGjkM1g8S6p9UWD+bf7YEAYYYzZsLtbilFTe z4nL4AV6VJmC7dBIlTi3Mj2eymD/2dkKP6UXlliWkq67feVg1KG+4UIp89lFW7v5Y8Muw3Fm uQbFvxyhN8n3tmhRe+ScWsndSBDxYOZgkbCSIfNPdZrHcnOLfA7xMJZeRCjqUpwhIjxQdFA7 n0s0KZ2cHIsemtBM8b2WXSQG9CjqAJHVkDhrBWKThDRF7k80oiJdEQlTEiVhaEDURXq+2XmG jpCnvRQDb28EJSsQlNEAzwzHMeplddfB0vCg9fRk/kOBMDBtGsTvNT9OYUZD+7jaf0gvBvBB lbKmmMMX7uJB+ejY7bnw6ePNrVPErWyfHzR5WYrIFUtgoR3LigKnw5apzc7UIV9G8uiIcZEn C+QJCK43jgnkPcSmwVPztcrkbC84g1K5v2Dxh9amXKLBA1/i+CAY8JWMTepsFohIFMXNLj+B RJoOcR4HGYXZ6CAJa3Glu3mCmYqHTOKwezJTAvmsCLd3W7WxOGF8BbBjVaPjcZfavOvkin0u DaFvhAmrzN6lL0msY17JCZo046z8oAqkyvEflFbC0S1R/POzehKrzQ1RFRD3/YzzlhmIowkM BpTqNBeHEzQAlIhQuyu1ugmQtfsYYq6FPmWMRfFPes/4JUU/PQARAQABtCVOaXRlc2ggTmFy YXlhbiBMYWwgPG5pbGFsQHJlZGhhdC5jb20+iQI9BBMBCAAnBQJZeKUKAhsjBQkJZgGABQsJ CAcCBhUICQoLAgQWAgMBAh4BAheAAAoJEKOGQNwGMqM56lEP/A2KMs/pu0URcVk/kqVwcBhU SnvB8DP3lDWDnmVrAkFEOnPX7GTbactQ41wF/xwjwmEmTzLrMRZpkqz2y9mV0hWHjqoXbOCS 6RwK3ri5e2ThIPoGxFLt6TrMHgCRwm8YuOSJ97o+uohCTN8pmQ86KMUrDNwMqRkeTRW9wWIQ EdDqW44VwelnyPwcmWHBNNb1Kd8j3xKlHtnS45vc6WuoKxYRBTQOwI/5uFpDZtZ1a5kq9Ak/ MOPDDZpd84rqd+IvgMw5z4a5QlkvOTpScD21G3gjmtTEtyfahltyDK/5i8IaQC3YiXJCrqxE r7/4JMZeOYiKpE9iZMtS90t4wBgbVTqAGH1nE/ifZVAUcCtycD0f3egX9CHe45Ad4fsF3edQ ESa5tZAogiA4Hc/yQpnnf43a3aQ67XPOJXxS0Qptzu4vfF9h7kTKYWSrVesOU3QKYbjEAf95 NewF9FhAlYqYrwIwnuAZ8TdXVDYt7Z3z506//sf6zoRwYIDA8RDqFGRuPMXUsoUnf/KKPrtR ceLcSUP/JCNiYbf1/QtW8S6Ca/4qJFXQHp0knqJPGmwuFHsarSdpvZQ9qpxD3FnuPyo64S2N Dfq8TAeifNp2pAmPY2PAHQ3nOmKgMG8Gn5QiORvMUGzSz8Lo31LW58NdBKbh6bci5+t/HE0H pnyVf5xhNC/FuQINBFl4pQoBEACr+MgxWHUP76oNNYjRiNDhaIVtnPRqxiZ9v4H5FPxJy9UD Bqr54rifr1E+K+yYNPt/Po43vVL2cAyfyI/LVLlhiY4yH6T1n+Di/hSkkviCaf13gczuvgz4 KVYLwojU8+naJUsiCJw01MjO3pg9GQ+47HgsnRjCdNmmHiUQqksMIfd8k3reO9SUNlEmDDNB XuSzkHjE5y/R/6p8uXaVpiKPfHoULjNRWaFc3d2JGmxJpBdpYnajoz61m7XJlgwl/B5Ql/6B dHGaX3VHxOZsfRfugwYF9CkrPbyO5PK7yJ5vaiWre7aQ9bmCtXAomvF1q3/qRwZp77k6i9R3 tWfXjZDOQokw0u6d6DYJ0Vkfcwheg2i/Mf/epQl7Pf846G3PgSnyVK6cRwerBl5a68w7xqVU 4KgAh0DePjtDcbcXsKRT9D63cfyfrNE+ea4i0SVik6+N4nAj1HbzWHTk2KIxTsJXypibOKFX 2VykltxutR1sUfZBYMkfU4PogE7NjVEU7KtuCOSAkYzIWrZNEQrxYkxHLJsWruhSYNRsqVBy KvY6JAsq/i5yhVd5JKKU8wIOgSwC9P6mXYRgwPyfg15GZpnw+Fpey4bCDkT5fMOaCcS+vSU1 UaFmC4Ogzpe2BW2DOaPU5Ik99zUFNn6cRmOOXArrryjFlLT5oSOe4IposgWzdwARAQABiQIl BBgBCAAPBQJZeKUKAhsMBQkJZgGAAAoJEKOGQNwGMqM5ELoP/jj9d9gF1Al4+9bngUlYohYu 0sxyZo9IZ7Yb7cHuJzOMqfgoP4tydP4QCuyd9Q2OHHL5AL4VFNb8SvqAxxYSPuDJTI3JZwI7 d8JTPKwpulMSUaJE8ZH9n8A/+sdC3CAD4QafVBcCcbFe1jifHmQRdDrvHV9Es14QVAOTZhnJ vweENyHEIxkpLsyUUDuVypIo6y/Cws+EBCWt27BJi9GH/EOTB0wb+2ghCs/i3h8a+bi+bS7L FCCm/AxIqxRurh2UySn0P/2+2eZvneJ1/uTgfxnjeSlwQJ1BWzMAdAHQO1/lnbyZgEZEtUZJ x9d9ASekTtJjBMKJXAw7GbB2dAA/QmbA+Q+Xuamzm/1imigz6L6sOt2n/X/SSc33w8RJUyor SvAIoG/zU2Y76pKTgbpQqMDmkmNYFMLcAukpvC4ki3Sf086TdMgkjqtnpTkEElMSFJC8npXv 3QnGGOIfFug/qs8z03DLPBz9VYS26jiiN7QIJVpeeEdN/LKnaz5LO+h5kNAyj44qdF2T2AiF HxnZnxO5JNP5uISQH3FjxxGxJkdJ8jKzZV7aT37sC+Rp0o3KNc+GXTR+GSVq87Xfuhx0LRST NK9ZhT0+qkiN7npFLtNtbzwqaqceq3XhafmCiw8xrtzCnlB/C4SiBr/93Ip4kihXJ0EuHSLn VujM7c/b4pps Organization: Red Hat Inc, Message-ID: <1ee122a6-7c6a-f630-ea38-9f78960b76be@redhat.com> Date: Wed, 11 Mar 2020 15:05:59 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="4qb8WLNjq3ajil9xtH0BeNRe2tGFbwosw" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --4qb8WLNjq3ajil9xtH0BeNRe2tGFbwosw Content-Type: multipart/mixed; boundary="QX3AFwGDvJNzwG4cp2sIXiy3edNL1QisG" --QX3AFwGDvJNzwG4cp2sIXiy3edNL1QisG Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US On 3/11/20 2:49 PM, Paolo Bonzini wrote: > On 11/03/20 19:34, Nitesh Narayan Lal wrote: >> Previously all fields of structure kvm_lapic_irq were not initialized >> before it was passed to kvm_bitmap_or_dest_vcpus(). Which will cause >> an issue when any of those fields are used for processing a request. >> This patch initializes all the fields of kvm_lapic_irq based on the >> values which are passed through the ioapic redirect_entry object. > Can you explain better how the bug manifests itself? For example not initializing the irq.msi_redir_hint field, could lead to a situation where it carries garbage (non-zero) value. This will lead to misbehavior of kvm_apic_map_get_dest_lapic() when it invo= kes the kvm_lowest_prio_delivery(), that will return true because of non-zero msi_redir_hint field. To be on the safe side, I thought of initializing other struct fields as we= ll. If the above explanation makes sense, I can include it in the patch subject and send a second version of this patch? > > Thanks, > > Paolo > >> Fixes: 7ee30bc132c6("KVM: x86: deliver KVM IOAPIC scan request to target= vCPUs") >> Signed-off-by: Nitesh Narayan Lal >> --- >> arch/x86/kvm/ioapic.c | 7 +++++-- >> 1 file changed, 5 insertions(+), 2 deletions(-) >> >> diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c >> index 7668fed..3a8467d 100644 >> --- a/arch/x86/kvm/ioapic.c >> +++ b/arch/x86/kvm/ioapic.c >> @@ -378,12 +378,15 @@ static void ioapic_write_indirect(struct kvm_ioapi= c *ioapic, u32 val) >> =09=09if (e->fields.delivery_mode =3D=3D APIC_DM_FIXED) { >> =09=09=09struct kvm_lapic_irq irq; >> =20 >> -=09=09=09irq.shorthand =3D APIC_DEST_NOSHORT; >> =09=09=09irq.vector =3D e->fields.vector; >> =09=09=09irq.delivery_mode =3D e->fields.delivery_mode << 8; >> -=09=09=09irq.dest_id =3D e->fields.dest_id; >> =09=09=09irq.dest_mode =3D >> =09=09=09 kvm_lapic_irq_dest_mode(!!e->fields.dest_mode); >> +=09=09=09irq.level =3D 1; >> +=09=09=09irq.trig_mode =3D e->fields.trig_mode; >> +=09=09=09irq.shorthand =3D APIC_DEST_NOSHORT; >> +=09=09=09irq.dest_id =3D e->fields.dest_id; >> +=09=09=09irq.msi_redir_hint =3D false; >> =09=09=09bitmap_zero(&vcpu_bitmap, 16); >> =09=09=09kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq, >> =09=09=09=09=09=09 &vcpu_bitmap); >> --=20 Nitesh --QX3AFwGDvJNzwG4cp2sIXiy3edNL1QisG-- --4qb8WLNjq3ajil9xtH0BeNRe2tGFbwosw Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEkXcoRVGaqvbHPuAGo4ZA3AYyozkFAl5pNpcACgkQo4ZA3AYy oznNVw//bf/rilGP0lQnt2uVyp8SPqfAN70HM/Q2mUHJjGNzfJz8G/YXs9FeTgkO qek7aheW278l6TXlZSDu8TDt1vNFZ7tXS6bfKCS2GgSMQt7jhu+4GfpudqQStvMZ nKeIZDEhiMNrAmERG3XqdTvzwiTjzdTfRn6QUpsx/GUBGbKC6GwIoAydqOj6/Ld4 BCVFakVnXeKDQwwlZDhj8DnQ9bSp7BwGCjptZw/TpYVpBGg/NqM1nE2Pya8yJtvA zs11b22i6E1fRydDVwdjb5qspwgqXoRmw99WBvax0/WOPscp3UvT9C2rwT9pOaqJ C6OcERCXRmgSDBHFlEEab9hViDPhBBhvl8obJVo/7Y354o5ySi1df+enN/yaWpc1 B5YQnohSP7fSMWowXcJvlzCEg/jds5onFlwIvCXWBmAvFHDo/R3XX+c7uHTfbuqa 3tIEzZwxuFr1B/h5FsRvdvdQ12B2jSqi9cZM8uKEq5IOb880JSRMubzYmV00n4kY nOfRLCkyW3hmAgyqZSNxD27eOc9AsIbdlFBL9QQKW2IthBobE3KpKp/4yGbSab/+ JBqguvnoLs8SGGL894CfUdih5Tu5eDyFqXjpIdbTzK4j1mFthffh5ZwtlR0z13S+ cS8FCSyNlnw2zZ1FmUoagsM/RW3K3sbRSfsfLntT4yaBYBa9CZA= =JuN2 -----END PGP SIGNATURE----- --4qb8WLNjq3ajil9xtH0BeNRe2tGFbwosw--