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Tue, 22 Oct 2024 11:23:36 -0400 X-MC-Unique: BIUZs8xyMiiBAIIHAgBEHA-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A5A521956096; Tue, 22 Oct 2024 15:23:27 +0000 (UTC) Received: from redhat.com (unknown [10.39.194.70]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id EF32F1956088; Tue, 22 Oct 2024 15:23:16 +0000 (UTC) Date: Tue, 22 Oct 2024 17:23:13 +0200 From: Kevin Wolf To: =?iso-8859-1?Q?C=E9dric?= Le Goater Cc: Jamin Lin , Peter Maydell , Steven Lee , Troy Lee , Andrew Jeffery , Joel Stanley , Alistair Francis , Hanna Reitz , Thomas Huth , Laurent Vivier , Paolo Bonzini , "open list:ASPEED BMCs" , "open list:All patches CC here" , "open list:Block layer core" , troy_lee@aspeedtech.com, yunlin.tang@aspeedtech.com Subject: Re: [PATCH v2 01/18] aspeed/smc: Fix write incorrect data into flash in user mode Message-ID: References: <20241022094110.1574011-1-jamin_lin@aspeedtech.com> <20241022094110.1574011-2-jamin_lin@aspeedtech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.519, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1.697, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: Y+l0pl80Auto Am 22.10.2024 um 15:40 hat Cédric Le Goater geschrieben: > > > static const VMStateDescription vmstate_aspeed_smc = { > > > .name = "aspeed.smc", > > > - .version_id = 2, > > > + .version_id = 3, > > > .minimum_version_id = 2, > > > .fields = (const VMStateField[]) { > > > VMSTATE_UINT32_ARRAY(regs, AspeedSMCState, ASPEED_SMC_R_MAX), > > > VMSTATE_UINT8(snoop_index, AspeedSMCState), > > > VMSTATE_UINT8(snoop_dummies, AspeedSMCState), > > > + VMSTATE_BOOL(unselect, AspeedSMCState), > > > VMSTATE_END_OF_LIST() > > > } > > > }; > > > > I think this will break migration compatibility. In order to enable > > at least forward migration, it should be: > > > > VMSTATE_BOOL_V(unselect, AspeedSMCState, 3), > > This is correct. I will fix the patch. > > Some background, > > The aspeed machines are fully emulated and the Aspeed SoC models are not > part of any virt* machines (yet). So migration support is a bit of a > theory. We have done our best to maintain some support, compatibility > not being a priority. IOW, it's not perfectly tuned as on virt machines. > > Also, on ARM, migration of the CPU secure mode (I think this is the reason, > Peter please correct me !) is not supported and if migration is initiated > after Linux has started, the machine will hang. That's a good reason not to implement backwards migration for now, it would only complicate things. But as long as we claim to be migratable by having VMStateDescriptions and even increasing version_id, we should at least try to keep that part correct. > However, if one day, an aspeed model becomes part of a virt machine, we > should be more careful. I would start by resetting all vmstate versions > to 1! Why would you reset it? Keeping 3 (or whatever it will be by then) as the first serious supported version shouldn't hurt and probably avoids some confusion. Kevin