From: CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>
Date: Wed, 29 Oct 2025 10:51:43 +0000 (+0000)
Subject: pcie: Add a function to check if pasid privileged mode is enabled
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7e31028a303129c12a7f35e380804a0c8b93bcd;p=thirdparty%2Fqemu.git

pcie: Add a function to check if pasid privileged mode is enabled

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20251029105137.1097933-4-clement.mathieu--drif@eviden.com>
---

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index c481c16c0f..50fc4aa8eb 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -1340,6 +1340,16 @@ void pcie_pri_init(PCIDevice *dev, uint16_t offset, uint32_t outstanding_pr_cap,
     dev->exp.pri_cap = offset;
 }
 
+static inline bool pcie_pasid_check_ctrl_bit_enabled(const PCIDevice *dev,
+                                                     uint16_t mask)
+{
+    if (!pci_is_express(dev) || !dev->exp.pasid_cap) {
+        return false;
+    }
+    return (pci_get_word(dev->config + dev->exp.pasid_cap + PCI_PASID_CTRL) &
+                mask) != 0;
+}
+
 uint32_t pcie_pri_get_req_alloc(const PCIDevice *dev)
 {
     if (!pcie_pri_enabled(dev)) {
@@ -1359,11 +1369,12 @@ bool pcie_pri_enabled(const PCIDevice *dev)
 
 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;
+    return pcie_pasid_check_ctrl_bit_enabled(dev, PCI_PASID_CTRL_ENABLE);
+}
+
+bool pcie_pasid_priv_enabled(PCIDevice *dev)
+{
+    return pcie_pasid_check_ctrl_bit_enabled(dev, PCI_PASID_CTRL_PRIV);
 }
 
 bool pcie_ats_enabled(const PCIDevice *dev)
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index fc02aeb169..d4e065db82 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -165,5 +165,6 @@ void pcie_pri_init(PCIDevice *dev, uint16_t offset, uint32_t outstanding_pr_cap,
 uint32_t pcie_pri_get_req_alloc(const PCIDevice *dev);
 bool pcie_pri_enabled(const PCIDevice *dev);
 bool pcie_pasid_enabled(const PCIDevice *dev);
+bool pcie_pasid_priv_enabled(PCIDevice *dev);
 bool pcie_ats_enabled(const PCIDevice *dev);
 #endif /* QEMU_PCIE_H */