From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linutronix.de (193.142.43.55:993) by crypto-ml.lab.linutronix.de with IMAP4-SSL for ; 15 Oct 2019 19:38:58 -0000 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120] helo=us-smtp-1.mimecast.com) by Galois.linutronix.de with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1iKSen-0006oa-9A for speck@linutronix.de; Tue, 15 Oct 2019 21:38:58 +0200 Received: by mail-wr1-f71.google.com with SMTP id a15so1550248wrr.0 for ; Tue, 15 Oct 2019 12:38:52 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:ddc7:c53c:581a:7f3e? ([2001:b07:6468:f312:ddc7:c53c:581a:7f3e]) by smtp.gmail.com with ESMTPSA id w7sm190363wmd.22.2019.10.15.12.38.50 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Oct 2019 12:38:50 -0700 (PDT) Subject: [MODERATED] Re: EPT/IOMMU shattering on SNB References: From: Paolo Bonzini Message-ID: <7fa1bd72-93d0-0196-01ea-66d12604604d@redhat.com> Date: Tue, 15 Oct 2019 21:38:50 +0200 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/mixed; boundary="gzX41gkUeJ5cfA6WXxk0TkCsSSAIDBFD6"; protected-headers="v1" To: speck@linutronix.de List-ID: This is an OpenPGP/MIME encrypted message (RFC 4880 and 3156) --gzX41gkUeJ5cfA6WXxk0TkCsSSAIDBFD6 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 14/10/19 14:50, speck for Andrew Cooper wrote: > Avoiding sharing the EPT and IOMMU tables does avoid the problem, but > that is to be expected as the shattering activity now has no interactio= n > with the IOMMU. >=20 > Has anyone experimented with the above scenario, and if so, how has > testing gone? Nope, sorry. KVM and VFIO do not share page tables. Paolo --gzX41gkUeJ5cfA6WXxk0TkCsSSAIDBFD6--