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