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AJvYcCXpb0oUhWcM/qbvmL6tcwDDsR8KDaOzGWpjKnBNDZGH369IcoA5qnhZBNK4SbHWCr8umBdPHndPzQk=@lists.xenproject.org X-Gm-Message-State: AOJu0YwffuUDoqK/NNPA6ePlTyDxjB3Yo4qUluvp2eiff29Yo1pWO7Ov TcnB7dm2XIH8z9o1m18cL/WU9FVA7qLyx2riN7kNyU3deYTKIbVJaK/b7wXpnLE= X-Google-Smtp-Source: AGHT+IEwczYs7aBpaEpvQ2pEECZs66fYdWTHEsfED50h1Hq8TQZKZmaHi7CO9mdEztaBy4gHNRLoxQ== X-Received: by 2002:a05:6402:5255:b0:5ce:de18:3fb7 with SMTP id 4fb4d7f45d1cf-5cf0a4475a7mr12238981a12.21.1731409056934; Tue, 12 Nov 2024 02:57:36 -0800 (PST) Message-ID: Date: Tue, 12 Nov 2024 10:57:35 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] x86/ucode: Remove the collect_cpu_info() call from parse_blob() To: Jan Beulich Cc: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Xen-devel References: <20241107122117.4073266-1-andrew.cooper3@citrix.com> <20241107122117.4073266-4-andrew.cooper3@citrix.com> <5aa29b23-cf22-45a5-b7b6-7e307a2238d2@citrix.com> <6d972a06-4acd-4b6c-b8e9-543a338d66ae@citrix.com> <3f0ad893-4a67-488d-a350-020fdef2ad1f@suse.com> Content-Language: en-GB From: Andrew Cooper Autocrypt: addr=andrew.cooper3@citrix.com; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 12/11/2024 10:49 am, Jan Beulich wrote: > On 12.11.2024 11:36, Andrew Cooper wrote: >> On 07/11/2024 9:58 pm, Andrew Cooper wrote: >>> On 07/11/2024 12:21 pm, Andrew Cooper wrote: >>>> With the tangle of logic starting to come under control, it is now plain to >>>> see that parse_blob()'s side effect of re-gathering the signature/revision is >>>> pointless. >>>> >>>> The cpu_request_microcode() hooks need the signature only. The BSP gathers >>>> this in early_microcode_init(), the APs and S3 in microcode_update_cpu(). For >>>> good measure, the apply_microcode() hooks also keep the revision correct as >>>> load attempts are made. >>>> >>>> This finally gets us down to a single call per CPU on boot / S3 resume, and no >>>> calls during late-load hypercalls. >>>> >>>> No functional change. >>>> >>>> Signed-off-by: Andrew Cooper >>>> --- >>>> CC: Jan Beulich >>>> CC: Roger Pau Monné >>>> >>>> Slightly RFC. >>>> >>>> Just before posting, I've realised that cpu_request_microcode() does actually >>>> use the current CPU revision, and it's buggy, and it's the cause of `xen-ucode >>>> --force` not working as expected. >>>> >>>> I'm tempted to do another series cleaning that up in isolation, such that this >>>> patch becomes true in this form. >>> Actually no.  Having tried a bit, I think it's easier to do with patch 2 >>> already in place. >>> >>> So instead I'm tempted to edit the middle paragraph to note that it >>> currently uses the revision but that's going to be fixed shortly.  The >>> rest of the paragraph explains why it's still safe anyway. >> So, after the latter series, this patch happens to be accurate. >> >> cpu_request_microcode() does read the revision, but discards the result >> of the calculation which used it. > What's the intended overall sequence of patches then? With two series that > (aiui) now have grown some sort of dependency, and with this series have > gained a 4/3 patch, having a clear picture would certainly help. Might it > be best if you merge both series and re-submit as a single one? The order turns out to be as emailed out and threaded. ~Andrew