From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9353A3B9D9F; Mon, 11 May 2026 08:57:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778489857; cv=none; b=bzMs+dzsPF5L3AiNrgxbd+DcVtPxOJsLuzkVKFoIyjcmwiix3igHNEkb9aU01JCIfKqOyps/A5s7IY3hKkvIdIcdqaHS7VF7Q7MY8LWz4F22FPSJZrRBw5DY6BQSMkZA5joKelw89jDlCmWM4+KYTT4eFKHYl7JWAtqf8LJFYZU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778489857; c=relaxed/simple; bh=yG1ZQpDp59m7GIi0rClPuRqEcexWJ1Je7cyz4dCBFJo=; h=Message-ID:Subject:From:To:Cc:Date:Content-Type:MIME-Version; b=PkA69LxsItkabxug6wseisrdCSq2t6vQRK+u/DZryDZIN74lxG8EUiVjD4QxttVqrn4q6gzYqO/+i84aLvQ2AF1/ut9ExBOYeRcV8zzflwdykGuFwh080LDgCuIDgnWuN8MKPUNi4ivuYYdpFiE7qdH5b2QxlfK84gZs/uPO9ag= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ZkLujkeH; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ZkLujkeH" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=zhkE8m1bTkpWiqGtlhKzD3LU8FaLp3DU7tLfKoKSNzw=; b=ZkLujkeHAdzl6TVM1LqDRAlsd1 ycTRG8fgZlvV/cz+lwdyC1d9MmhT92AvmtvwPDkCSmX/jRcBy8TjWvGuZgpGCSp5rDNl4MtGRfns1 rBw/mLxHqnvs7PniVjpXMC/jZQ1GTGxiXrQUWhWpakZpCaSJDJy5xdSeHp0rDDBSvvQLdh7UqAP5Y /BtGilO/fCFyw7GjFxbNWaJlEGjbknfad66mrQ6og6tB5TJsXqe/L4cZTHLpEb5lmW5juzcxW37rB shtNWc8IL2gVJIfKMTRVP+px06FVIJUHDPcZ+c0mOqRsH9d3qXHBcvzeyfOVQsi8Mdy4R5J7FsJZm 5FvfZwoA==; Received: from 54-240-197-234.amazon.com ([54.240.197.234] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMMS8-00000007t91-1uZE; Mon, 11 May 2026 08:57:29 +0000 Message-ID: <6856b269d2af706eae397e0cf9c1231f89d9a932.camel@infradead.org> Subject: [PATCH] Documentation: KVM: Document guest-visible compatibility expectations From: David Woodhouse To: Paolo Bonzini , Jonathan Corbet , Shuah Khan , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Raghavendra Rao Ananta , Eric Auger , Kees Cook , Arnd Bergmann , Nathan Chancellor , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org Date: Mon, 11 May 2026 09:57:27 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-G9nCGITdCY7OEi2eGNSc" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-G9nCGITdCY7OEi2eGNSc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse Document the expectation that KVM maintains guest-visible compatibility across host kernel upgrades and rollbacks. Specifically: - State saved/restored via KVM ioctls must be sufficient for live migration (and live update) between kernel versions. - Where a new kernel introduces a guest-visible change, it provides a mechanism for userspace to select the previous behaviour. - This allows both forward migration (upgrade) and backward migration (rollback) of guests. These expectations have been implicitly required on x86 but were not explicitly documented. Harmonise the expectations across all of KVM. Signed-off-by: David Woodhouse --- Documentation/virt/kvm/api.rst | 14 ++++++++++++++ Documentation/virt/kvm/review-checklist.rst | 20 ++++++++++++++------ 2 files changed, 28 insertions(+), 6 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rs= t index 269970221797..864f3daa7acb 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -97,6 +97,20 @@ Instead, kvm defines extension identifiers and a facilit= y to query whether a particular extension identifier is available. If it is, a set of ioctls is available for application use. =20 +KVM will ensure that the state that can be saved and restored via the +KVM ioctls is sufficient to allow migration of a running guest between +host kernels while maintaining full compatibility of the guest-visible +device model. This includes migration to newer kernels (upgrade) and +to older kernels (rollback), provided that the older kernel supports +the set of features exposed to the guest. Where a new kernel version +introduces a guest-visible change, it will provide a mechanism (such +as a capability or a device attribute) that allows userspace to select +the previous behaviour. This serves two purposes: guests migrated +from an older kernel can continue to run with their original +observable environment, and new guests launched on the newer kernel +can be configured to match the feature set of the older kernel, so +that they remain migratable to the older kernel in case of rollback. + =20 4. API description =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D diff --git a/Documentation/virt/kvm/review-checklist.rst b/Documentation/vi= rt/kvm/review-checklist.rst index 053f00c50d66..f0fbe1577a90 100644 --- a/Documentation/virt/kvm/review-checklist.rst +++ b/Documentation/virt/kvm/review-checklist.rst @@ -18,22 +18,30 @@ Review checklist for kvm patches 5. New features must default to off (userspace should explicitly request = them). Performance improvements can and should default to on. =20 -6. New cpu features should be exposed via KVM_GET_SUPPORTED_CPUID2, +6. Guest-visible changes must not break migration compatibility. A guest + migrated from an older kernel must be able to run with its original + observable environment, and a guest launched on a newer kernel must be + configurable to match the older kernel's feature set for rollback. + Where a change alters guest-visible behaviour, provide a mechanism + (capability, device attribute, etc.) for userspace to select the + previous behaviour. + +7. New cpu features should be exposed via KVM_GET_SUPPORTED_CPUID2, or its equivalent for non-x86 architectures =20 -7. The feature should be testable (see below). +8. The feature should be testable (see below). =20 -8. Changes should be vendor neutral when possible. Changes to common cod= e +9. Changes should be vendor neutral when possible. Changes to common cod= e are better than duplicating changes to vendor code. =20 -9. Similarly, prefer changes to arch independent code than to arch depend= ent +10. Similarly, prefer changes to arch independent code than to arch depend= ent code. =20 -10. User/kernel interfaces and guest/host interfaces must be 64-bit clean +11. User/kernel interfaces and guest/host interfaces must be 64-bit clean (all variables and sizes naturally aligned on 64-bit; use specific typ= es only - u64 rather than ulong). =20 -11. New guest visible features must either be documented in a hardware man= ual +12. New guest visible features must either be documented in a hardware man= ual or be accompanied by documentation. =20 Testing of KVM code --=20 2.43.0 --=-G9nCGITdCY7OEi2eGNSc Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 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