linux-kernel - [PATCH 3/3] x86/PCI: limit the size of the 64bit BAR to 256GB

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Date:   Wed, 29 Nov 2017 15:12:29 +0100
From:   "Christian König" 
        <ckoenig.leichtzumerken@...il.com>
To:     helgaas@...nel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] x86/PCI: limit the size of the 64bit BAR to 256GB

This avoids problems with Xen which hides some memory resources from the
OS and potentially also allows memory hotplug while this fixup is
enabled.

Signed-off-by: Christian König <christian.koenig@....com>
---
 arch/x86/pci/fixup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index c817ab85dc82..149adbc7f2a3 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -701,7 +701,7 @@ static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
 	res->name = "PCI Bus 0000:00";
 	res->flags = IORESOURCE_PREFETCH | IORESOURCE_MEM |
 		IORESOURCE_MEM_64 | IORESOURCE_WINDOW;
-	res->start = 0x100000000ull;
+	res->start = 0xbd00000000ull;
 	res->end = 0xfd00000000ull - 1;
 
 	/* Just grab the free area behind system memory for this */
-- 
2.11.0