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Tue, 30 Nov 2021 05:32:06 -0800 (PST) Received: from rekt.COMFAST ([177.68.212.35]) by smtp.gmail.com with ESMTPSA id h22sm2058071vsu.0.2021.11.30.05.32.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Nov 2021 05:32:06 -0800 (PST) From: Daniel Henrique Barboza To: qemu-devel@nongnu.org Subject: [PATCH v2 2/2] docs/system/ppc/powernv.rst: document KVM support status Date: Tue, 30 Nov 2021 10:31:53 -0300 Message-Id: <20211130133153.444601-3-danielhb413@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211130133153.444601-1-danielhb413@gmail.com> References: <20211130133153.444601-1-danielhb413@gmail.com> MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::92b (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::92b; envelope-from=danielhb413@gmail.com; helo=mail-ua1-x92b.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, PDS_HP_HELO_NORDNS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Henrique Barboza , qemu-ppc@nongnu.org, clg@kaod.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Put in a more accessible place the reasoning behind our decision to officially drop KVM support in the powernv machine. Signed-off-by: Daniel Henrique Barboza --- docs/system/ppc/powernv.rst | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/docs/system/ppc/powernv.rst b/docs/system/ppc/powernv.rst index 86186b7d2c..8304e85c51 100644 --- a/docs/system/ppc/powernv.rst +++ b/docs/system/ppc/powernv.rst @@ -58,6 +58,19 @@ Prebuilt images of ``skiboot`` and ``skiroot`` are made available on the `OpenPO QEMU includes a prebuilt image of ``skiboot`` which is updated when a more recent version is required by the models. +Current acceleration status +--------------------------- + +KVM acceleration in Linux Power hosts is provided by the kvm-hv and +kvm-pr modules. kvm-hv is adherent to PAPR and it's not compliant with +powernv. kvm-pr in theory could be used as a valid accel option but +this isn't supported by kvm-pr at this moment. + +To spare users from dealing with not so informative errors when attempting +to use accel=kvm, the powernv machine will throw an error informing that +KVM is not supported. This can be revisited in the future if kvm-pr (or +any other KVM alternative) is usable as KVM accel for this machine. + Boot options ------------