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 <jbar...@virtuousgeek.org>
CC: linux-...@vger.kernel.org
CC: sta...@kernel.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
---
drivers/pci/xen-pcifront.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 492b7d8..659efd1 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -401,8 +401,8 @@ static int pcifront_claim_resource(struct pci_dev *dev,
void *data)
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",
+ "resource %s/%d! Device offline. Try"
+ "using e820_host=1 in the guest
config.\n",
pci_name(dev), i);
}
}
--
1.7.4.1
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