diff mbox series

[v9,52/58] hw/xen: Automatically add xen-platform PCI device for emulated Xen guests

Message ID 20230128081113.1615111-53-dwmw2@infradead.org (mailing list archive)
State New, archived
Headers show
Series Xen HVM support under KVM | expand

Commit Message

David Woodhouse Jan. 28, 2023, 8:11 a.m. UTC 
From: David Woodhouse <dwmw@amazon.co.uk>

It isn't strictly mandatory but Linux guests at least will only map their
grant tables over the dummy BAR that it provides, and don't sufficient wit
to map them in any other unused part of their guest address space. So
include it by default for minimal surprise factor.

As I come to document "how to run a Xen guest in QEMU", this means one
fewer thing to tell the user about, according to the mantra of "if it
needs documenting, fix it first, then document what remains".

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 hw/i386/pc.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index a12a7a67e9..5ec3518b9e 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1313,6 +1313,9 @@  void pc_basic_device_init(struct PCMachineState *pcms,
 #ifdef CONFIG_XEN_EMU
     if (xen_mode == XEN_EMULATE) {
         xen_evtchn_connect_gsis(gsi);
+        if (pcms->bus) {
+            pci_create_simple(pcms->bus, -1, "xen-platform");
+        }
     }
 #endif