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Fri, 11 Jun 2021 14:18:56 +0200 (CEST) From: Markus Armbruster To: Daniel Henrique Barboza Subject: Re: [PATCH v2 2/2] spapr: use DEVICE_UNPLUG_ERROR to report unplug errors References: <20210604200353.1206897-1-danielhb413@gmail.com> <20210604200353.1206897-3-danielhb413@gmail.com> Date: Fri, 11 Jun 2021 14:18:56 +0200 In-Reply-To: <20210604200353.1206897-3-danielhb413@gmail.com> (Daniel Henrique Barboza's message of "Fri, 4 Jun 2021 17:03:53 -0300") Message-ID: <87y2bgppan.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=216.205.24.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.199, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action 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: david@gibson.dropbear.id.au, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, groug@kaod.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Daniel Henrique Barboza writes: > Linux Kernel 5.12 is now unisolating CPU DRCs in the device_removal > error path, signalling that the hotunplug process wasn't successful. > This allow us to send a DEVICE_UNPLUG_ERROR in drc_unisolate_logical() > to signal this error to the management layer. > > We also have another error path in spapr_memory_unplug_rollback() for > configured LMB DRCs. Kernels older than 5.13 will not unisolate the LMBs > in the hotunplug error path, but it will reconfigure them. Let's send > the DEVICE_UNPLUG_ERROR event in that code path as well to cover the > case of older kernels. > > Signed-off-by: Daniel Henrique Barboza > --- > hw/ppc/spapr.c | 2 +- > hw/ppc/spapr_drc.c | 15 +++++++++------ > 2 files changed, 10 insertions(+), 7 deletions(-) > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c > index c23bcc4490..29aa2f467d 100644 > --- a/hw/ppc/spapr.c > +++ b/hw/ppc/spapr.c > @@ -3639,7 +3639,7 @@ void spapr_memory_unplug_rollback(SpaprMachineState *spapr, DeviceState *dev) > */ > qapi_error = g_strdup_printf("Memory hotunplug rejected by the guest " > "for device %s", dev->id); > - qapi_event_send_mem_unplug_error(dev->id, qapi_error); > + qapi_event_send_device_unplug_error(dev->id, qapi_error); Incompatible change: we now emit DEVICE_UNPLUG_ERROR instead of MEM_UNPLUG_ERROR. Intentional? If yes, we need a release note. To avoid the incompatible, we can emit both, and deprecate MEM_UNPLUG_ERROR. What about the MEM_UNPLUG_ERROR in acpi_memory_hotplug_write()? > } > > /* Callback to be called during DRC release. */ > diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c > index a2f2634601..0e1a8733bc 100644 > --- a/hw/ppc/spapr_drc.c > +++ b/hw/ppc/spapr_drc.c > @@ -17,6 +17,8 @@ > #include "hw/ppc/spapr_drc.h" > #include "qom/object.h" > #include "migration/vmstate.h" > +#include "qapi/error.h" > +#include "qapi/qapi-events-machine.h" > #include "qapi/visitor.h" > #include "qemu/error-report.h" > #include "hw/ppc/spapr.h" /* for RTAS return codes */ > @@ -160,6 +162,10 @@ static uint32_t drc_unisolate_logical(SpaprDrc *drc) > * means that the kernel is refusing the removal. > */ > if (drc->unplug_requested && drc->dev) { > + const char qapi_error_fmt[] = "Device hotunplug rejected by the " > + "guest for device %s"; > + g_autofree char *qapi_error = NULL; > + > if (spapr_drc_type(drc) == SPAPR_DR_CONNECTOR_TYPE_LMB) { > spapr = SPAPR_MACHINE(qdev_get_machine()); > > @@ -167,13 +173,10 @@ static uint32_t drc_unisolate_logical(SpaprDrc *drc) > } > > drc->unplug_requested = false; > - error_report("Device hotunplug rejected by the guest " > - "for device %s", drc->dev->id); > + error_report(qapi_error_fmt, drc->dev->id); > > - /* > - * TODO: send a QAPI DEVICE_UNPLUG_ERROR event when > - * it is implemented. > - */ > + qapi_error = g_strdup_printf(qapi_error_fmt, drc->dev->id); > + qapi_event_send_device_unplug_error(drc->dev->id, qapi_error); > } > > return RTAS_OUT_SUCCESS; /* Nothing to do */ Reporting both to stderr and QMP is odd. Can you describe a use case where the report to stderr is useful?