From: Magnus Kulke <magnuskulke@linux.microsoft.com>
To: Wei Liu <wei.liu@kernel.org>
Cc: qemu-devel@nongnu.org, "Magnus Kulke" <magnuskulke@microsoft.com>,
"Doru Blânzeanu" <doru.blanzeanu@microsoft.com>,
"Doru Blânzeanu" <dblanzeanu@linux.microsoft.com>
Subject: Re: [PATCH] target/i386/mshv: add MshvPutState for vcpu writes
Date: Wed, 11 Nov 2026 20:41:51 +0100 [thread overview]
Message-ID: <avTE/ynd4hd+9CHt@example.com> (raw)
In-Reply-To: <20261109203421.GB3536171@liuwe-devbox-debian-v2.local>
On Mon, Nov 09, 2026 at 12:34:21PM -0800, Wei Liu wrote:
> On Mon, Nov 09, 2026 at 01:39:49PM +0100, Magnus Kulke wrote:
> > Currently QEMU marks a vcpu state as dirty also on merely inspectional
> > reads, e.g. via "info registers", which triggers a writeback to the
> > hypervisor. For MSRs that cause a side-effect when written to this is
> > undesired.
> >
> > We introduce an MshvPutState flag into the writeback logic to differentiate
> > "runtime" from "full" and "reset" writebacks that should occur e.g. after
> > a migration or startup.
> >
> > Discrete side-effectful MSRs are excluded in runtime writebacks. So far
> > we only mark one MSR as not runtime-safe, but probably more will be
> > added eventually.
> >
> > Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
>
> Reviewed-by: Wei Liu <wei.liu@kernel.org>
queued in pull-20261111
prev parent reply other threads:[~2026-11-11 19:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-09 12:39 [PATCH] target/i386/mshv: add MshvPutState for vcpu writes Magnus Kulke
2026-11-09 13:55 ` Mohamed Mediouni
2026-11-09 20:34 ` Wei Liu
2026-11-11 19:41 ` Magnus Kulke [this message]
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