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Re: [PATCH v10 11/12] hw/pci: Convert rom_bar into OnOffAuto


From: BALATON Zoltan
Subject: Re: [PATCH v10 11/12] hw/pci: Convert rom_bar into OnOffAuto
Date: Wed, 3 Jul 2024 04:15:23 +0200 (CEST)

On Tue, 2 Jul 2024, Michael S. Tsirkin wrote:
On Thu, Jun 27, 2024 at 03:08:00PM +0900, Akihiko Odaki wrote:
rom_bar is tristate but was defined as uint32_t so convert it into
OnOffAuto.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>

Commit log should explain why this is an improvement,
not just what's done.


diff --git a/docs/igd-assign.txt b/docs/igd-assign.txt
index e17bb50789ad..35c6c8e28493 100644
--- a/docs/igd-assign.txt
+++ b/docs/igd-assign.txt
@@ -35,7 +35,7 @@ IGD has two different modes for assignment using vfio-pci:
       ISA/LPC bridge device (vfio-pci-igd-lpc-bridge) on the root bus at
       PCI address 1f.0.
     * The IGD device must have a VGA ROM, either provided via the romfile
-      option or loaded automatically through vfio (standard).  rombar=0
+      option or loaded automatically through vfio (standard).  rombar=off
       will disable legacy mode support.
     * Hotplug of the IGD device is not supported.
     * The IGD device must be a SandyBridge or newer model device.

...

diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c
index 39dae72497e0..0e920ed0691a 100644
--- a/hw/vfio/pci-quirks.c
+++ b/hw/vfio/pci-quirks.c
@@ -33,7 +33,7 @@
  * execution as noticed with the BCM 57810 card for lack of a
  * more better way to handle such issues.
  * The  user can still override by specifying a romfile or
- * rombar=1.
+ * rombar=on.
  * Please see https://bugs.launchpad.net/qemu/+bug/1284874
  * for an analysis of the 57810 card hang. When adding
  * a new vendor id/device id combination below, please also add


So we are apparently breaking a bunch of users who followed
documentation to the dot. Why is this a good idea?

On/off is clearer than 1/0. But isn't 1/0 a synonym for on/off so previous command lines would still work?

Regards,
BALATON Zoltan



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