[v1] virtio,pci,pc: features, fixes, tests

[PULL 05/31] pcie: Helper functions to check if PASID is enabled

Michael S. Tsirkin posted 31 patches 8 months, 1 week ago

Diff against v1
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Maintainers: "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, Stefano Garzarella <sgarzare@redhat.com>, Peter Xu <peterx@redhat.com>, David Hildenbrand <david@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Jason Wang <jasowang@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Ani Sinha <anisinha@redhat.com>, Fabiano Rosas <farosas@suse.de>, Laurent Vivier <lvivier@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>

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[PULL 05/31] pcie: Helper functions to check if PASID is enabled

Posted by Michael S. Tsirkin 8 months, 1 week ago

From: CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>

pasid_enabled checks whether the capability is
present or not. If so, we read the configuration space to get
the status of the feature (enabled or not).

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Message-Id: <20250520071823.764266-3-clement.mathieu--drif@eviden.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/hw/pci/pcie.h | 2 ++
 hw/pci/pcie.c         | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index fe82e0a915..dff98ff2c6 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -154,4 +154,6 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev,
 
 void pcie_pasid_init(PCIDevice *dev, uint16_t offset, uint8_t pasid_width,
                      bool exec_perm, bool priv_mod);
+
+bool pcie_pasid_enabled(const PCIDevice *dev);
 #endif /* QEMU_PCIE_H */
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 4f935ff420..db9756d861 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -1239,3 +1239,12 @@ void pcie_pasid_init(PCIDevice *dev, uint16_t offset, uint8_t pasid_width,
 
     dev->exp.pasid_cap = offset;
 }
+
+bool pcie_pasid_enabled(const PCIDevice *dev)
+{
+    if (!pci_is_express(dev) || !dev->exp.pasid_cap) {
+        return false;
+    }
+    return (pci_get_word(dev->config + dev->exp.pasid_cap + PCI_PASID_CTRL) &
+                PCI_PASID_CTRL_ENABLE) != 0;
+}
-- 
MST