This change allows to read and write to the extended config space of PCI
Express devices by setting the size limit to 4096 bytes. The size limit
remains 256 bytes for non PCIe devices.

Signed-off-by: Thierry Escande <thierry.escande@vates.tech>
---
 hw/xen/xen-hvm-common.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/hw/xen/xen-hvm-common.c b/hw/xen/xen-hvm-common.c
index 62d88804c4..15090d77cf 100644
--- a/hw/xen/xen-hvm-common.c
+++ b/hw/xen/xen-hvm-common.c
@@ -396,6 +396,7 @@ static void cpu_ioreq_config(XenIOState *state, ioreq_t *req)
 {
     uint32_t sbdf = req->addr >> 32;
     uint32_t reg = req->addr;
+    uint32_t limit;
     XenPciDevice *xendev;
 
     if (req->size != sizeof(uint8_t) && req->size != sizeof(uint16_t) &&
@@ -412,10 +413,12 @@ static void cpu_ioreq_config(XenIOState *state, ioreq_t *req)
             continue;
         }
 
+        limit = pci_is_express(xendev->pci_dev) ?
+                    PCIE_CONFIG_SPACE_SIZE : PCI_CONFIG_SPACE_SIZE;
         if (!req->data_is_ptr) {
             if (req->dir == IOREQ_READ) {
                 req->data = pci_host_config_read_common(
-                    xendev->pci_dev, reg, PCI_CONFIG_SPACE_SIZE,
+                    xendev->pci_dev, reg, limit,
                     req->size);
                 trace_cpu_ioreq_config_read(req, xendev->sbdf, reg,
                                             req->size, req->data);
@@ -423,7 +426,7 @@ static void cpu_ioreq_config(XenIOState *state, ioreq_t *req)
                 trace_cpu_ioreq_config_write(req, xendev->sbdf, reg,
                                              req->size, req->data);
                 pci_host_config_write_common(
-                    xendev->pci_dev, reg, PCI_CONFIG_SPACE_SIZE,
+                    xendev->pci_dev, reg, limit,
                     req->data, req->size);
             }
         } else {
@@ -431,7 +434,7 @@ static void cpu_ioreq_config(XenIOState *state, ioreq_t *req)
 
             if (req->dir == IOREQ_READ) {
                 tmp = pci_host_config_read_common(
-                    xendev->pci_dev, reg, PCI_CONFIG_SPACE_SIZE,
+                    xendev->pci_dev, reg, limit,
                     req->size);
                 trace_cpu_ioreq_config_read(req, xendev->sbdf, reg,
                                             req->size, tmp);
@@ -441,7 +444,7 @@ static void cpu_ioreq_config(XenIOState *state, ioreq_t *req)
                 trace_cpu_ioreq_config_write(req, xendev->sbdf, reg,
                                              req->size, tmp);
                 pci_host_config_write_common(
-                    xendev->pci_dev, reg, PCI_CONFIG_SPACE_SIZE,
+                    xendev->pci_dev, reg, limit,
                     tmp, req->size);
             }
         }
-- 
2.51.0



--
Thierry Escande | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

web: https://vates.tech