[PATCH v2] microvm: turn off io reservations for pcie root ports

From: Gerd Hoffmann <kraxel@redhat.com>
To: qemu-devel@nongnu.org
Cc: Richard Henderson <richard.henderson@linaro.org>,
	Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Sergio Lopez <slp@redhat.com>,
	Eduardo Habkost <eduardo@habkost.net>,
	Gerd Hoffmann <kraxel@redhat.com>
Subject: [PATCH v2] microvm: turn off io reservations for pcie root ports
Date: Fri,  1 Jul 2022 11:15:16 +0200	[thread overview]
Message-ID: <20220701091516.43489-1-kraxel@redhat.com> (raw)

The pcie host bridge has no io window on microvm,
so io reservations will not work.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/i386/microvm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c
index 4b3b1dd262f1..06f779e1aaee 100644
--- a/hw/i386/microvm.c
+++ b/hw/i386/microvm.c
@@ -667,6 +667,14 @@ static void microvm_machine_initfn(Object *obj)
     qemu_register_powerdown_notifier(&mms->powerdown_req);
 }
 
+GlobalProperty microvm_properties[] = {
+    /*
+     * pcie host bridge (gpex) on microvm has no io address window,
+     * so reserving io space is not going to work.  Turn it off.
+     */
+    { "pcie-root-port", "io-reserve", "0" },
+};
+
 static void microvm_class_init(ObjectClass *oc, void *data)
 {
     X86MachineClass *x86mc = X86_MACHINE_CLASS(oc);
@@ -757,6 +765,9 @@ static void microvm_class_init(ObjectClass *oc, void *data)
         "Set off to disable adding virtio-mmio devices to the kernel cmdline");
 
     machine_class_allow_dynamic_sysbus_dev(mc, TYPE_RAMFB_DEVICE);
+
+    compat_props_add(mc->compat_props, microvm_properties,
+                     G_N_ELEMENTS(microvm_properties));
 }
 
 static const TypeInfo microvm_machine_info = {
-- 
2.36.1


