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Tue, 23 Jun 2020 08:57:16 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 4E699113846D; Tue, 23 Jun 2020 10:57:15 +0200 (CEST) From: Markus Armbruster To: Auger Eric Subject: Re: [PATCH v3 1/5] qdev: Introduce DEFINE_PROP_RESERVED_REGION References: <20200611151209.22547-1-eric.auger@redhat.com> <20200611151209.22547-2-eric.auger@redhat.com> <87k0zzz6nt.fsf@dusky.pond.sub.org> Date: Tue, 23 Jun 2020 10:57:15 +0200 In-Reply-To: (Auger Eric's message of "Tue, 23 Jun 2020 10:22:47 +0200") Message-ID: <87r1u6jh1w.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=207.211.31.81; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/23 02:54:39 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: peter.maydell@linaro.org, jean-philippe@linaro.org, mst@redhat.com, qemu-devel@nongnu.org, peterx@redhat.com, qemu-arm@nongnu.org, pbonzini@redhat.com, bbhushan2@marvell.com, eric.auger.pro@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Auger Eric writes: > Hi Markus, > > On 6/22/20 1:22 PM, Markus Armbruster wrote: >> Eric Auger writes: >> >>> Introduce a new property defining a reserved region: >>> , , . >>> >>> This will be used to encode reserved IOVA regions. >>> >>> For instance, in virtio-iommu use case, reserved IOVA regions >>> will be passed by the machine code to the virtio-iommu-pci >>> device (an array of those). The type of the reserved region >>> will match the virtio_iommu_probe_resv_mem subtype value: >>> - VIRTIO_IOMMU_RESV_MEM_T_RESERVED (0) >>> - VIRTIO_IOMMU_RESV_MEM_T_MSI (1) >>> >>> on PC/Q35 machine, this will be used to inform the >>> virtio-iommu-pci device it should bypass the MSI region. >>> The reserved region will be: 0xfee00000, 0xfeefffff, 1. >>> >>> On ARM, we can declare the ITS MSI doorbell as an MSI >>> region to prevent MSIs from being mapped on guest side. >>> >>> Signed-off-by: Eric Auger [...] >>> diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c >>> index cc924815da..15b84adbee 100644 >>> --- a/hw/core/qdev-properties.c >>> +++ b/hw/core/qdev-properties.c [...] >>> +static void set_reserved_region(Object *obj, Visitor *v, const char *name, >>> + void *opaque, Error **errp) >>> +{ >>> + DeviceState *dev = DEVICE(obj); >>> + Property *prop = opaque; >>> + ReservedRegion *rr = qdev_get_prop_ptr(dev, prop); >>> + Error *local_err = NULL; >>> + const char *endptr; >>> + char *str; >>> + int ret; >>> + >>> + if (dev->realized) { >>> + qdev_prop_set_after_realize(dev, name, errp); >>> + return; >>> + } >>> + >>> + visit_type_str(v, name, &str, &local_err); >>> + if (local_err) { >>> + error_propagate(errp, local_err); >>> + return; >>> + } >>> + >>> + ret = qemu_strtou64(str, &endptr, 16, &rr->low); >>> + if (ret) { >>> + error_setg(errp, "Failed to decode reserved region low addr"); >>> + error_append_hint(errp, >>> + "should be an address in hexadecimal\n"); >> >> Comes out like this: >> >> qemu-system-x86_64: -device ...: Failed to decode reserved region low addr >> should be an address in hexadecimal >> >> I'd capitalize the other way, to get >> >> qemu-system-x86_64: -device ...: failed to decode reserved region low addr >> Should be an address in hexadecimal >> >> Note: output is made up; I failed at figuring out how to use the new >> property. An example in PATCH 4's commit message might help. > OK I will add one example. In practice in the virtio-iommu case the > property is not really meant to be passed by the end-user but should be > set by the machine code. However I have just tested from the cmd line > and it looks using commas as separators is a bad idea because it > collides with ',' separating properties. So if you're OK I will change > the comma into ':'. Please do. [...]