From: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
To: "Denis V. Lunev" <den@openvz.org>
Cc: andrey.zhadchenko@virtuozzo.com, khorenko@virtuozzo.com,
svt-core@virtuozzo.com
Subject: Re: [PATCH v2 hci-8.0/hci-8.1 4/6] i386: keep bus-lock-detect for AMD guests on vz machine types up to vz9.2.0 #VSTOR-152291
Date: Thu, 29 Oct 2026 13:53:01 +0200 [thread overview]
Message-ID: <179327478156.738267.7629260065890363469.b4-review@b4> (raw)
In-Reply-To: <20261029113436.93521-5-den@openvz.org>
On Thu, 29 Oct 2026 12:34:34 +0100, Denis V. Lunev <den@openvz.org> wrote:
> Since kernel commit 54950bfe2b69 KVM on AMD no longer offers
> bus-lock-detect. A Zen 5 guest started under an older kernel has it in
> its CPUID, and QEMU filters it on the new host, so migration, restore
> and snapshot revert fail (VSTOR-152291).
>
> Add x-bus-lock-detect-compat and turn it on in pc_vz_9_2_compat: an
> AMD guest keeps a requested bus-lock-detect. The guest loses nothing
> it had: bus lock detection did not work under KVM on AMD before kernel
> commit 62ad461079e7, DR6 bit 11 stays fixed, and a Linux 6.13 or newer
> guest only logs one "unchecked MSR access" warning when it brings a
> vCPU online.
>
> [...]
Acked-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
--
Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
next prev parent reply other threads:[~2026-10-29 11:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-29 11:34 [PATCH v2 hci-8.0/hci-8.1 0/6] i386: keep CPU features of guests from older nodes on vz machine types #VSTOR-152264 Denis V. Lunev
2026-10-29 11:34 ` [PATCH v2 hci-8.0/hci-8.1 1/6] i386/pc: raise the limit of compat arrays per Virtuozzo machine type to four #VSTOR-152264 Denis V. Lunev
2026-10-29 11:36 ` no-reply
2026-10-29 11:53 ` Andrey Drobyshev
2026-10-29 11:34 ` [PATCH v2 hci-8.0/hci-8.1 2/6] i386: keep hle and rtm on Virtuozzo machine types up to vz9.2.0 #PSBM-149402 Denis V. Lunev
2026-10-29 11:39 ` no-reply
2026-10-29 11:53 ` Andrey Drobyshev
2026-10-29 11:34 ` [PATCH v2 hci-8.0/hci-8.1 3/6] i386: keep spec-ctrl for AMD guests on vz machine types up to vz9.2.0 #VSTOR-151770 Denis V. Lunev
2026-10-29 11:39 ` no-reply
2026-10-29 11:53 ` Andrey Drobyshev
2026-10-29 11:34 ` [PATCH v2 hci-8.0/hci-8.1 4/6] i386: keep bus-lock-detect for AMD guests on vz machine types up to vz9.2.0 #VSTOR-152291 Denis V. Lunev
2026-10-29 11:39 ` no-reply
2026-10-29 11:53 ` Andrey Drobyshev [this message]
2026-10-29 11:34 ` [PATCH v2 hci-8.0/hci-8.1 5/6] i386: keep v-vmsave-vmload for nested AMD guests on vz types up to vz9.2.0 #VSTOR-152264 Denis V. Lunev
2026-10-29 11:39 ` no-reply
2026-10-29 11:53 ` Andrey Drobyshev
2026-10-29 11:34 ` [PATCH v2 hci-8.0/hci-8.1 6/6] i386: keep SVM leaf features without svm on vz types up to vz9.2.0 #PSBM-144630 Denis V. Lunev
2026-10-29 11:41 ` no-reply
2026-10-29 11:53 ` Andrey Drobyshev
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