Commit 8c28ef3f authored by Jan Beulich's avatar Jan Beulich Committed by Boris Ostrovsky

xen-pciback: relax BAR sizing write value check

Just like done in d2bd05d8 ("xen-pciback: return proper values during
BAR sizing") for the ROM BAR, ordinary ones also shouldn't compare the
written value directly against ~0, but consider the r/o bits at the
bottom (if any).
Signed-off-by: default avatarJan Beulich <>
Reviewed-by: default avatarJuergen Gross <>
Signed-off-by: default avatarBoris Ostrovsky <>
parent 51a9a828
......@@ -169,6 +169,9 @@ static int rom_write(struct pci_dev *dev, int offset, u32 value, void *data)
static int bar_write(struct pci_dev *dev, int offset, u32 value, void *data)
struct pci_bar_info *bar = data;
unsigned int pos = (offset - PCI_BASE_ADDRESS_0) / 4;
const struct resource *res = dev->resource;
u32 mask;
if (unlikely(!bar)) {
pr_warn(DRV_NAME ": driver data not found for %s\n",
......@@ -179,7 +182,13 @@ static int bar_write(struct pci_dev *dev, int offset, u32 value, void *data)
/* A write to obtain the length must happen as a 32-bit write.
* This does not (yet) support writing individual bytes
if (value == ~0)
if (res[pos].flags & IORESOURCE_IO)
else if (pos && (res[pos - 1].flags & IORESOURCE_MEM_64))
mask = 0;
if ((value | mask) == ~0U)
bar->which = 1;
else {
u32 tmpval;
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