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[82.27.106.168]) by smtp.gmail.com with ESMTPSA id l124sm5487151wml.8.2021.09.30.11.52.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 11:52:27 -0700 (PDT) From: Jean-Philippe Brucker To: eric.auger@redhat.com Subject: [PATCH 2/3] virtio-iommu: Default to bypass during boot Date: Thu, 30 Sep 2021 19:50:50 +0100 Message-Id: <20210930185050.262759-3-jean-philippe@linaro.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210930185050.262759-1-jean-philippe@linaro.org> References: <20210930185050.262759-1-jean-philippe@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::331; envelope-from=jean-philippe@linaro.org; helo=mail-wm1-x331.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, RCVD_IN_DNSWL_NONE=-0.0001, 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: Jean-Philippe Brucker , qemu-devel@nongnu.org, mst@redhat.com Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Currently the virtio-iommu device must be programmed before it allows DMA from any PCI device. This can make the VM entirely unusable when a virtio-iommu driver isn't present, for example in a bootloader that loads the OS from storage. Similarly to the other vIOMMU implementations, default to DMA bypassing the IOMMU during boot. Add a "boot-bypass" option that lets users change this behavior. Signed-off-by: Jean-Philippe Brucker --- include/hw/virtio/virtio-iommu.h | 1 + hw/virtio/virtio-iommu.c | 28 +++++++++++++++++++++++----- hw/virtio/trace-events | 4 ++-- 3 files changed, 26 insertions(+), 7 deletions(-) -- 2.33.0 diff --git a/include/hw/virtio/virtio-iommu.h b/include/hw/virtio/virtio-iommu.h index 273e35c04b..4c66989ca4 100644 --- a/include/hw/virtio/virtio-iommu.h +++ b/include/hw/virtio/virtio-iommu.h @@ -58,6 +58,7 @@ struct VirtIOIOMMU { GTree *domains; QemuMutex mutex; GTree *endpoints; + bool boot_bypass; }; #endif diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index 1b23e8e18c..82edeaa101 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -728,8 +728,7 @@ static IOMMUTLBEntry virtio_iommu_translate(IOMMUMemoryRegion *mr, hwaddr addr, .perm = IOMMU_NONE, }; - bypass_allowed = virtio_vdev_has_feature(&s->parent_obj, - VIRTIO_IOMMU_F_BYPASS); + bypass_allowed = s->config.bypass; sid = virtio_iommu_get_bdf(sdev); @@ -828,7 +827,8 @@ static void virtio_iommu_get_config(VirtIODevice *vdev, uint8_t *config_data) config->input_range.start, config->input_range.end, config->domain_range.end, - config->probe_size); + config->probe_size, + config->bypass); memcpy(config_data, &dev->config, sizeof(struct virtio_iommu_config)); } @@ -836,13 +836,29 @@ static void virtio_iommu_set_config(VirtIODevice *vdev, const uint8_t *config_data) { struct virtio_iommu_config config; + VirtIOIOMMU *dev = VIRTIO_IOMMU(vdev); memcpy(&config, config_data, sizeof(struct virtio_iommu_config)); + + if (config.bypass != dev->config.bypass) { + if (!virtio_vdev_has_feature(vdev, VIRTIO_IOMMU_F_BYPASS_CONFIG)) { + virtio_error(vdev, "cannot set config.bypass"); + return; + } + if (config.bypass != 0 && config.bypass != 1) { + warn_report("invalid config.bypass value '%d'", config.bypass); + dev->config.bypass = 0; + return; + } + dev->config.bypass = config.bypass; + } + trace_virtio_iommu_set_config(config.page_size_mask, config.input_range.start, config.input_range.end, config.domain_range.end, - config.probe_size); + config.probe_size, + config.bypass); } static uint64_t virtio_iommu_get_features(VirtIODevice *vdev, uint64_t f, @@ -986,6 +1002,7 @@ static void virtio_iommu_device_realize(DeviceState *dev, Error **errp) s->config.input_range.end = -1UL; s->config.domain_range.end = 32; s->config.probe_size = VIOMMU_PROBE_SIZE; + s->config.bypass = s->boot_bypass; virtio_add_feature(&s->features, VIRTIO_RING_F_EVENT_IDX); virtio_add_feature(&s->features, VIRTIO_RING_F_INDIRECT_DESC); @@ -993,9 +1010,9 @@ static void virtio_iommu_device_realize(DeviceState *dev, Error **errp) virtio_add_feature(&s->features, VIRTIO_IOMMU_F_INPUT_RANGE); virtio_add_feature(&s->features, VIRTIO_IOMMU_F_DOMAIN_RANGE); virtio_add_feature(&s->features, VIRTIO_IOMMU_F_MAP_UNMAP); - virtio_add_feature(&s->features, VIRTIO_IOMMU_F_BYPASS); virtio_add_feature(&s->features, VIRTIO_IOMMU_F_MMIO); virtio_add_feature(&s->features, VIRTIO_IOMMU_F_PROBE); + virtio_add_feature(&s->features, VIRTIO_IOMMU_F_BYPASS_CONFIG); qemu_mutex_init(&s->mutex); @@ -1169,6 +1186,7 @@ static const VMStateDescription vmstate_virtio_iommu = { static Property virtio_iommu_properties[] = { DEFINE_PROP_LINK("primary-bus", VirtIOIOMMU, primary_bus, "PCI", PCIBus *), + DEFINE_PROP_BOOL("boot-bypass", VirtIOIOMMU, boot_bypass, true), DEFINE_PROP_END_OF_LIST(), }; diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 8ed19e9d0c..6bc3821ba3 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -90,8 +90,8 @@ virtio_mmio_setting_irq(int level) "virtio_mmio setting IRQ %d" virtio_iommu_device_reset(void) "reset!" virtio_iommu_get_features(uint64_t features) "device supports features=0x%"PRIx64 virtio_iommu_device_status(uint8_t status) "driver status = %d" -virtio_iommu_get_config(uint64_t page_size_mask, uint64_t start, uint64_t end, uint32_t domain_range, uint32_t probe_size) "page_size_mask=0x%"PRIx64" start=0x%"PRIx64" end=0x%"PRIx64" domain_range=%d probe_size=0x%x" -virtio_iommu_set_config(uint64_t page_size_mask, uint64_t start, uint64_t end, uint32_t domain_range, uint32_t probe_size) "page_size_mask=0x%"PRIx64" start=0x%"PRIx64" end=0x%"PRIx64" domain_bits=%d probe_size=0x%x" +virtio_iommu_get_config(uint64_t page_size_mask, uint64_t start, uint64_t end, uint32_t domain_range, uint32_t probe_size, uint8_t bypass) "page_size_mask=0x%"PRIx64" start=0x%"PRIx64" end=0x%"PRIx64" domain_range=%d probe_size=0x%x bypass=0x%x" +virtio_iommu_set_config(uint64_t page_size_mask, uint64_t start, uint64_t end, uint32_t domain_range, uint32_t probe_size, uint8_t bypass) "page_size_mask=0x%"PRIx64" start=0x%"PRIx64" end=0x%"PRIx64" domain_bits=%d probe_size=0x%x bypass=0x%x" virtio_iommu_attach(uint32_t domain_id, uint32_t ep_id) "domain=%d endpoint=%d" virtio_iommu_detach(uint32_t domain_id, uint32_t ep_id) "domain=%d endpoint=%d" virtio_iommu_map(uint32_t domain_id, uint64_t virt_start, uint64_t virt_end, uint64_t phys_start, uint32_t flags) "domain=%d virt_start=0x%"PRIx64" virt_end=0x%"PRIx64 " phys_start=0x%"PRIx64" flags=%d"