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[121.45.221.81]) by smtp.gmail.com with ESMTPSA id 11sm5996012pfv.43.2020.03.28.05.32.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 28 Mar 2020 05:32:22 -0700 (PDT) Subject: Re: [RFC for-5.1 4/4] spapr: Don't allow unplug of NVLink2 devices To: David Gibson , groug@kaod.org References: <20200326054009.454477-1-david@gibson.dropbear.id.au> <20200326054009.454477-5-david@gibson.dropbear.id.au> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT WQzMuVSxjuXW4nJ6f4OFHqL2dU//qR+BM/eJ0TT3OnfLcPqfucGxubhT7n/CXUxEy+mvWwnm 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Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200326054009.454477-5-david@gibson.dropbear.id.au> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::542 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, clg@kaod.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 26/03/2020 16:40, David Gibson wrote: > Currently, we can't properly handle unplug of NVLink2 devices, because we > don't have code to tear down their special memory resources. There's not > a lot of impetus to implement that. Since hardware NVLink2 devices can't > be hot unplugged, the guest side drivers don't usually support unplug > anyway. > > Therefore, simply prevent unplug of NVLink2 devices. > > Signed-off-by: David Gibson > --- > hw/ppc/spapr_pci.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c > index 55ca9dee1e..5c8262413a 100644 > --- a/hw/ppc/spapr_pci.c > +++ b/hw/ppc/spapr_pci.c > @@ -1666,6 +1666,11 @@ static void spapr_pci_unplug_request(HotplugHandler *plug_handler, > return; > } > > + if (spapr_phb_is_nvlink_dev(pdev, phb)) { > + error_setg(errp, "PCI: Cannot unplug NVLink2 devices"); > + return; > + } Just this would do as well: Object *po = OBJECT(pdev); uint64_t tgt = object_property_get_uint(po, "nvlink2-tgt", NULL); if (tgt) { error_setg(errp, "PCI: Cannot unplug NVLink2 devices"); return; } honestly, I admin what 1/4 fixes is cryptic but since there is not going to be any more new nvlinkX, this does not deserve this many patches imho. > + > /* ensure any other present functions are pending unplug */ > if (PCI_FUNC(pdev->devfn) == 0) { > for (i = 1; i < 8; i++) { > -- Alexey