47 lines
1.7 KiB
Diff
47 lines
1.7 KiB
Diff
|
From 8f924bd2691789f6b0d9deae9ddb046677a0610b Mon Sep 17 00:00:00 2001
|
||
|
|
From: Gerd Hoffmann <kraxel@redhat.com>
|
||
|
|
Date: Tue, 16 May 2023 11:47:58 +0200
|
||
|
|
Subject: OvmfPkg/PciHotPlugInitDxe: Do not reserve IO ports by default.
|
||
|
|
|
||
|
|
Flip the default for IO address space reservations for PCI(e) bridges
|
||
|
|
and root ports with hotplug support from TRUE to FALSE.
|
||
|
|
|
||
|
|
PCI(e) bridges will still get IO address space assigned in case:
|
||
|
|
|
||
|
|
(a) Downstream devices actually need IO address space, or
|
||
|
|
(b) Explicit configuration, using "qemu -device
|
||
|
|
pcie-root-port,io-reserve=<size>".
|
||
|
|
|
||
|
|
In case IO address space is exhausted edk2 will stop assigning resources
|
||
|
|
to PCI(e) bridges. This is not limited to IO resources, the affected
|
||
|
|
bridges will not get any memory resources assigned either.
|
||
|
|
|
||
|
|
This patch solves this issue by not handing out the scarce IO address
|
||
|
|
space, which is not needed in most cases anyway. Result is a more
|
||
|
|
consistent PCI configuration in virtual machine configurations with many
|
||
|
|
PCie root ports.
|
||
|
|
|
||
|
|
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
|
||
|
|
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
|
||
|
|
(cherry picked from commit 27727338b2c0e3f50eb0176a1044e903fcb3c3b1)
|
||
|
|
---
|
||
|
|
OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c | 2 +-
|
||
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
|
||
|
|
index 6b2b6797b3..69903a6009 100644
|
||
|
|
--- a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
|
||
|
|
+++ b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
|
||
|
|
@@ -589,7 +589,7 @@ GetResourcePadding (
|
||
|
|
return EFI_INVALID_PARAMETER;
|
||
|
|
}
|
||
|
|
|
||
|
|
- DefaultIo = TRUE;
|
||
|
|
+ DefaultIo = FALSE;
|
||
|
|
DefaultMmio = TRUE;
|
||
|
|
DefaultPrefMmio = TRUE;
|
||
|
|
|
||
|
|
--
|
||
|
|
2.39.3
|
||
|
|
|