Bug#903821: 4.9.110-1 Xen PV boot workaround
- To: 903821@bugs.debian.org, 903885@bugs.debian.org, 903800@bugs.debian.org, 903767@bugs.debian.org
- Cc: Benoît Tonnerre <bevito@gmail.com>, Sebastien KOECHLIN <seb.debian@koocotte.org>, "Michael J. Redd" <micredd@gmail.com>, Andy Smith <andy@strugglers.net>, Jaap Eldering <jaap@jaapeldering.nl>, Vincent Lefevre <vincent@vinc17.net>, Robby <robbyke@gmail.com>, Luis Miguel Parra <luismi@redparra.com>, Gianluigi Tiesi <sherpya@netfarm.it>, Jered Floyd <jered@convivian.com>, Valentin Vidic <Valentin.Vidic@CARNet.hr>
- Subject: Bug#903821: 4.9.110-1 Xen PV boot workaround
- From: Hans van Kranenburg <hans@knorrie.org>
- Date: Mon, 16 Jul 2018 19:28:37 +0200
- Message-id: <[🔎] 56479d19-0dc3-c70b-9a7d-2aa8c755f4c3@knorrie.org>
- Reply-to: Hans van Kranenburg <hans@knorrie.org>, 903821@bugs.debian.org
- References: <CAGoqP1q=MqvH-2aWxnsaqBO2UrA8DpWo9-iqB-FqOW3c4pOR7Q@mail.gmail.com>
Reportedly, adding pti=off to the kernel boot parameters will work
around the issue for now.
Turning off pti in the guest kernel is done in any case for PV. The
issue between 4.9.107 and 4.9.111 affects the detection and turning off
of pti, that's why forcing it off helps.
In 4.9.112 it's fixed in commit 1adc34adc3447c34926994b87db5d929f5ab45b5
"x86/cpu: Re-apply forced caps every time CPU caps are re-read"
Hans
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