pcie_sriov: Reset SR-IOV extended capability

pcie_sriov_pf_disable_vfs() is called when resetting the PF, but it only
disables VFs and does not reset SR-IOV extended capability, leaking the
state and making the VF Enable register inconsistent with the actual
state.

Replace pcie_sriov_pf_disable_vfs() with pcie_sriov_pf_reset(), which
does not only disable VFs but also resets the capability.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20240228-reuse-v8-3-282660281e60@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Sriram Yagnaraman <sriram.yagnaraman@ericsson.com>

diff --git a/hw/net/igb.c b/hw/net/igb.c
index 0b5c31a58bba2835b04fc9d0180e63f7cf6d9cca..9345506f81ec71797913e8f5911c85fc0665e68c 100644 (file)
--- a/hw/net/igb.c
+++ b/hw/net/igb.c
@@ -493,7 +493,7 @@ static void igb_qdev_reset_hold(Object *obj)
 
     trace_e1000e_cb_qdev_reset_hold();
 
-    pcie_sriov_pf_disable_vfs(d);
+    pcie_sriov_pf_reset(d);
     igb_core_reset(&s->core);
 }
 

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 2860a9bed1ecb7f961a5a6a7dbc855edd2586b4e..447c4de6fdae9c9104753201b80c7ed98e3a2569 100644 (file)
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -7116,7 +7116,7 @@ static void nvme_ctrl_reset(NvmeCtrl *n, NvmeResetType rst)
             }
 
             if (rst != NVME_RESET_CONTROLLER) {
-                pcie_sriov_pf_disable_vfs(pci_dev);
+                pcie_sriov_pf_reset(pci_dev);
             }
         }
 

diff --git a/hw/pci/pcie_sriov.c b/hw/pci/pcie_sriov.c
index da209b7f47fd38d33927281d79af2f4696b54ae3..51b66d1bb342e11f1e6dc06b45153ddb44f5c24a 100644 (file)
--- a/hw/pci/pcie_sriov.c
+++ b/hw/pci/pcie_sriov.c
@@ -249,16 +249,26 @@ void pcie_sriov_config_write(PCIDevice *dev, uint32_t address,
 }
 
 
-/* Reset SR/IOV VF Enable bit to trigger an unregister of all VFs */
-void pcie_sriov_pf_disable_vfs(PCIDevice *dev)
+/* Reset SR/IOV */
+void pcie_sriov_pf_reset(PCIDevice *dev)
 {
     uint16_t sriov_cap = dev->exp.sriov_cap;
-    if (sriov_cap) {
-        uint32_t val = pci_get_byte(dev->config + sriov_cap + PCI_SRIOV_CTRL);
-        if (val & PCI_SRIOV_CTRL_VFE) {
-            val &= ~PCI_SRIOV_CTRL_VFE;
-            pcie_sriov_config_write(dev, sriov_cap + PCI_SRIOV_CTRL, val, 1);
-        }
+    if (!sriov_cap) {
+        return;
+    }
+
+    pci_set_word(dev->config + sriov_cap + PCI_SRIOV_CTRL, 0);
+    unregister_vfs(dev);
+
+    /*
+     * Default is to use 4K pages, software can modify it
+     * to any of the supported bits
+     */
+    pci_set_word(dev->config + sriov_cap + PCI_SRIOV_SYS_PGSIZE, 0x1);
+
+    for (uint16_t i = 0; i < PCI_NUM_REGIONS; i++) {
+        pci_set_quad(dev->config + sriov_cap + PCI_SRIOV_BAR + i * 4,
+                     dev->exp.sriov_pf.vf_bar_type[i]);
     }
 }
 

diff --git a/include/hw/pci/pcie_sriov.h b/include/hw/pci/pcie_sriov.h
index 095fb0c9edf939089d43022d80339a166d083cb1..b77eb7bf58acd58bc9c613f07494108009c6a35d 100644 (file)
--- a/include/hw/pci/pcie_sriov.h
+++ b/include/hw/pci/pcie_sriov.h
@@ -58,8 +58,8 @@ void pcie_sriov_pf_add_sup_pgsize(PCIDevice *dev, uint16_t opt_sup_pgsize);
 void pcie_sriov_config_write(PCIDevice *dev, uint32_t address,
                              uint32_t val, int len);
 
-/* Reset SR/IOV VF Enable bit to unregister all VFs */
-void pcie_sriov_pf_disable_vfs(PCIDevice *dev);
+/* Reset SR/IOV */
+void pcie_sriov_pf_reset(PCIDevice *dev);
 
 /* Get logical VF number of a VF - only valid for VFs */
 uint16_t pcie_sriov_vf_number(PCIDevice *dev);