From: no-reply@sashiko.virtuozzo.com
To: andrey.zhadchenko@virtuozzo.com, "Denis V. Lunev" <den@openvz.org>
Cc: den@openvz.org, khorenko@virtuozzo.com, svt-core@virtuozzo.com
Subject: Re: [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
Date: Thu, 29 Oct 2026 11:39:48 +0000 [thread overview]
Message-ID: <010701a18775848a-d83b897d-9f0c-4f0d-a7bb-c244637d18cb-000000@eu-central-1.amazonses.com> (raw)
In-Reply-To: <20261029113436.93521-6-den@openvz.org>
> From: Denis V. Lunev <den@openvz.org>
>
> On Zen 4 client parts (family 19h models 0x18-0x1f and 0x60-0x7f) the
> 6.12 kernel clears virtualized VMSAVE/VMLOAD in init_amd_zen4(), which
> some BIOSes trigger on reboot, and KVM stops offering v-vmsave-vmload.
> A nested guest (svm=on) started before has it in its CPUID, and QEMU
> filters it on such a host, so migration, restore and snapshot revert
> fail.
>
> Add x-v-vmsave-vmload-compat and turn it on in pc_vz_9_2_compat: an
> AMD guest keeps a requested v-vmsave-vmload. This does not turn host
> VLS back on: KVM keeps intercepting VMLOAD and VMSAVE of the nested
> guest and emulates them (nested_vmcb_needs_vls_intercept()), which is
> only slower.
>
> Signed-off-by: Denis V. Lunev <den@openvz.org>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.vzint.dev/#/patchset/20261029113436.93521-1-den@openvz.org?part=5
next prev parent reply other threads:[~2026-10-29 11:39 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
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 [this message]
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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