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[79.183.252.180]) by smtp.gmail.com with ESMTPSA id w22sm12373273wmi.22.2021.04.02.02.31.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 02:31:43 -0700 (PDT) Date: Fri, 2 Apr 2021 05:31:40 -0400 From: "Michael S. Tsirkin" To: Jason Wang Subject: Re: [PATCH] virtio-pci: compat page aligned ATS Message-ID: <20210402053122-mutt-send-email-mst@kernel.org> References: <20210402075520.65871-1-jasowang@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210402075520.65871-1-jasowang@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=ham 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: ehabkost@redhat.com, qemu-devel@nongnu.org, qemu-stable@nongnu.org, Peter Xu , "Dr . David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Apr 02, 2021 at 03:55:20PM +0800, Jason Wang wrote: > Commit 4c70875372b8 ("pci: advertise a page aligned ATS") advertises > the page aligned via ATS capability (RO) to unbrek recent Linux IOMMU > drivers since 5.2. But it forgot the compat the capability which > breaks the migration from old machine type: > > (qemu) qemu-kvm: get_pci_config_device: Bad config data: i=0x104 read: > 0 device: 20 cmask: ff wmask: 0 w1cmask:0 > > This patch introduces a new parameter "ats_page_aligned" for > virtio-pci device and turn it on for machine type which is newer than > 5.1. > > Cc: Michael S. Tsirkin > Cc: Peter Xu > Cc: Dr. David Alan Gilbert > Cc: qemu-stable@nongnu.org > Fixes: 4c70875372b8 ("pci: advertise a page aligned ATS") > Signed-off-by: Jason Wang I think x-ats-page-aligned would be a better name. > --- > hw/core/machine.c | 1 + > hw/pci/pcie.c | 10 ++++++---- > hw/virtio/virtio-pci.c | 5 ++++- > hw/virtio/virtio-pci.h | 5 +++++ > include/hw/pci/pcie.h | 2 +- > 5 files changed, 17 insertions(+), 6 deletions(-) > > diff --git a/hw/core/machine.c b/hw/core/machine.c > index 9935c6ddd5..ad4459b0f2 100644 > --- a/hw/core/machine.c > +++ b/hw/core/machine.c > @@ -53,6 +53,7 @@ GlobalProperty hw_compat_5_1[] = { > { "nvme", "use-intel-id", "on"}, > { "pvpanic", "events", "1"}, /* PVPANIC_PANICKED */ > { "pl011", "migrate-clk", "off" }, > + { "virtio-pci", "ats_page_aligned", "off"}, > }; > const size_t hw_compat_5_1_len = G_N_ELEMENTS(hw_compat_5_1); > > diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c > index a733e2fb87..fd0fa157e8 100644 > --- a/hw/pci/pcie.c > +++ b/hw/pci/pcie.c > @@ -963,16 +963,18 @@ void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num) > pci_set_quad(dev->config + offset + pci_dsn_cap, ser_num); > } > > -void pcie_ats_init(PCIDevice *dev, uint16_t offset) > +void pcie_ats_init(PCIDevice *dev, uint16_t offset, bool aligned) > { > pcie_add_capability(dev, PCI_EXT_CAP_ID_ATS, 0x1, > offset, PCI_EXT_CAP_ATS_SIZEOF); > > dev->exp.ats_cap = offset; > > - /* Invalidate Queue Depth 0, Page Aligned Request 1 */ > - pci_set_word(dev->config + offset + PCI_ATS_CAP, > - PCI_ATS_CAP_PAGE_ALIGNED); > + /* Invalidate Queue Depth 0 */ > + if (aligned) { > + pci_set_word(dev->config + offset + PCI_ATS_CAP, > + PCI_ATS_CAP_PAGE_ALIGNED); > + } > /* STU 0, Disabled by default */ > pci_set_word(dev->config + offset + PCI_ATS_CTRL, 0); > > diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c > index 883045a223..ebe9716acf 100644 > --- a/hw/virtio/virtio-pci.c > +++ b/hw/virtio/virtio-pci.c > @@ -1848,7 +1848,8 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp) > } > > if (proxy->flags & VIRTIO_PCI_FLAG_ATS) { > - pcie_ats_init(pci_dev, last_pcie_cap_offset); > + pcie_ats_init(pci_dev, last_pcie_cap_offset, > + proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED); > last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF; > } > > @@ -1925,6 +1926,8 @@ static Property virtio_pci_properties[] = { > ignore_backend_features, false), > DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags, > VIRTIO_PCI_FLAG_ATS_BIT, false), > + DEFINE_PROP_BIT("ats_page_aligned", VirtIOPCIProxy, flags, > + VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true), > DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags, > VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true), > DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags, > diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h > index d7d5d403a9..2446dcd9ae 100644 > --- a/hw/virtio/virtio-pci.h > +++ b/hw/virtio/virtio-pci.h > @@ -42,6 +42,7 @@ enum { > VIRTIO_PCI_FLAG_INIT_PM_BIT, > VIRTIO_PCI_FLAG_INIT_FLR_BIT, > VIRTIO_PCI_FLAG_AER_BIT, > + VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, > }; > > /* Need to activate work-arounds for buggy guests at vmstate load. */ > @@ -84,6 +85,10 @@ enum { > /* Advanced Error Reporting capability */ > #define VIRTIO_PCI_FLAG_AER (1 << VIRTIO_PCI_FLAG_AER_BIT) > > +/* Page Aligned Address space Translation Service */ > +#define VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED \ > + (1 << VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT) > + > typedef struct { > MSIMessage msg; > int virq; > diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h > index 14c58ebdb6..6063bee0ec 100644 > --- a/include/hw/pci/pcie.h > +++ b/include/hw/pci/pcie.h > @@ -137,7 +137,7 @@ void pcie_acs_reset(PCIDevice *dev); > > void pcie_ari_init(PCIDevice *dev, uint16_t offset, uint16_t nextfn); > void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num); > -void pcie_ats_init(PCIDevice *dev, uint16_t offset); > +void pcie_ats_init(PCIDevice *dev, uint16_t offset, bool aligned); > > void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, > Error **errp); > -- > 2.24.3 (Apple Git-128)