| Date | Wed, 09 Nov 2011 13:32:03 -0800 | From | Greg KH <> | Subject | [076/264] xen-pcifront: Update warning comment to use e820_host option. |
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3.1-stable review patch. If anyone has any objections, please let me know.
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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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 <jbarnes@virtuousgeek.org> CC: linux-pci@vger.kernel.org [v2: Made the string less broken up. Suggested by Joe Perches] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- 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); } }
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