[lkml]   [2011]   [Nov]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[066/262] xen-pcifront: Update warning comment to use e820_host option.
3.0-stable review patch.  If anyone has any objections, please let me know.


From: Konrad Rzeszutek Wilk <>

commit 917e3e65c35459d52f0d0b890aa5df0cad07a051 upstream.

With Xen changeset 23428 "libxl: Add 'e820_host' option to config file"
the E820 as seen from the host can now be passed into the guest.
This means that a PV guest can now:
- Use the correct PCI I/O gap. Before these patches, Linux guest would
boot up and would tell:
[ 0.000000] Allocating PCI resources starting at 40000000 (gap: 40000000:c0000000)
while in actuality the PCI I/O gap should have been:
[ 0.000000] Allocating PCI resources starting at b0000000 (gap: b0000000:4c000000)

- The PV domain with PCI devices was limited to 3GB. It now can be booted
with 4GB, 8GB, or whatever number you want. The PCI devices will now _not_ conflict
with System RAM. Meaning the drivers can load.

CC: Jesse Barnes <>
[v2: Made the string less broken up. Suggested by Joe Perches]
Signed-off-by: Konrad Rzeszutek Wilk <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/pci/xen-pcifront.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -400,9 +400,8 @@ static int pcifront_claim_resource(struc
dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
pci_name(dev), i);
if (pci_claim_resource(dev, i)) {
- dev_err(&pdev->xdev->dev, "Could not claim "
- "resource %s/%d! Device offline. Try "
- "giving less than 4GB to domain.\n",
+ dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! "
+ "Device offline. Try using e820_host=1 in the guest config.\n",
pci_name(dev), i);

 \ /
  Last update: 2011-11-10 04:29    [W:0.488 / U:8.768 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site