[edk2-devel] [PATCH edk2-stable202002] OvmfPkg/QemuVideoDxe: unbreak "secondary-vga" and "bochs-display" support

[Laszlo Ersek]

In edk2 commit 333f32ec23dd, QemuVideoDxe gained support for QEMU's
"secondary-vga" device model (originally introduced in QEMU commit
63e3e24db2e9).

In QEMU commit 765c94290863, the "bochs-display" device was introduced,
which would work with QemuVideoDxe out of the box, reusing the
"secondary-vga" logic.

Support for both models has been broken since edk2 commit 662bd0da7fd7.
Said patch ended up requiring VGA IO Ports -- i.e., at least one of
EFI_PCI_IO_ATTRIBUTE_VGA_IO and EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 -- even if
the device wasn't actually VGA compatible.

Restrict the IO Ports requirement to VGA compatible devices.

Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Cc: Gerd Hoffmann <kraxel at redhat.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Marc W Chen <marc.w.chen at intel.com>
Cc: Philippe Mathieu-Daudé <philmd at redhat.com>
Fixes: 662bd0da7fd77e4d2cf9ef4a78015af5cad7d9db
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2555
Signed-off-by: Laszlo Ersek <lersek at redhat.com>
---

Notes:
    Repo:   https://github.com/lersek/edk2.git
    Branch: vga_io_bz_2555

 OvmfPkg/QemuVideoDxe/Driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/OvmfPkg/QemuVideoDxe/Driver.c b/OvmfPkg/QemuVideoDxe/Driver.c
index 6a4a860b3c25..37bbbbe843c9 100644
--- a/OvmfPkg/QemuVideoDxe/Driver.c
+++ b/OvmfPkg/QemuVideoDxe/Driver.c
@@ -292,7 +292,7 @@ QemuVideoControllerDriverStart (
   }
 
   SupportedVgaIo &= (UINT64)(EFI_PCI_IO_ATTRIBUTE_VGA_IO | EFI_PCI_IO_ATTRIBUTE_VGA_IO_16);
-  if (SupportedVgaIo == 0) {
+  if (SupportedVgaIo == 0 && IS_PCI_VGA (&Pci)) {
     Status = EFI_UNSUPPORTED;
     goto ClosePciIo;
   }

base-commit: 1d3215fd24f47eaa4877542a59b4bbf5afc0cfe8
-- 
2.19.1.3.g30247aa5d201


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