[RFC PATCH 08/21] xen_platform: exclude vfio-pci from the PCI platform unplug

From: David Woodhouse <dwmw2@infradead.org>
To: qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Paul Durrant <paul@xen.org>,
	Joao Martins <joao.m.martins@oracle.com>,
	Ankur Arora <ankur.a.arora@oracle.com>
Subject: [RFC PATCH 08/21] xen_platform: exclude vfio-pci from the PCI platform unplug
Date: Mon,  5 Dec 2022 17:31:24 +0000	[thread overview]
Message-ID: <20221205173137.607044-9-dwmw2@infradead.org> (raw)
In-Reply-To: <20221205173137.607044-1-dwmw2@infradead.org>

From: Joao Martins <joao.m.martins@oracle.com>

Such that PCI passthrough devices work for Xen emulated guests.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 hw/i386/xen/xen_platform.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c
index 710039851a..ae0a21f5bf 100644
--- a/hw/i386/xen/xen_platform.c
+++ b/hw/i386/xen/xen_platform.c
@@ -109,12 +109,25 @@ static void log_writeb(PCIXenPlatformState *s, char val)
 #define _UNPLUG_NVME_DISKS 3
 #define UNPLUG_NVME_DISKS (1u << _UNPLUG_NVME_DISKS)
 
+static bool pci_device_is_passthrough(PCIDevice *d)
+{
+    if (!strcmp(d->name, "xen-pci-passthrough")) {
+        return true;
+    }
+
+    if (xen_mode == XEN_EMULATE && !strcmp(d->name, "vfio-pci")) {
+        return true;
+    }
+
+    return false;
+}
+
 static void unplug_nic(PCIBus *b, PCIDevice *d, void *o)
 {
     /* We have to ignore passthrough devices */
     if (pci_get_word(d->config + PCI_CLASS_DEVICE) ==
             PCI_CLASS_NETWORK_ETHERNET
-            && strcmp(d->name, "xen-pci-passthrough") != 0) {
+            && !pci_device_is_passthrough(d)) {
         object_unparent(OBJECT(d));
     }
 }
@@ -187,9 +200,8 @@ static void unplug_disks(PCIBus *b, PCIDevice *d, void *opaque)
         !(flags & UNPLUG_IDE_SCSI_DISKS);
 
     /* We have to ignore passthrough devices */
-    if (!strcmp(d->name, "xen-pci-passthrough")) {
+    if (pci_device_is_passthrough(d))
         return;
-    }
 
     switch (pci_get_word(d->config + PCI_CLASS_DEVICE)) {
     case PCI_CLASS_STORAGE_IDE:
-- 
2.35.3


