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dm: passthrough: allow not page-aligned sized bar to be mapped

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Some physical bar sizes are not page aligned, in order to support them,
we map a bigger region which is page aligned.

Tracked-On: #3181
Signed-off-by: Tw <wei.tan@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@intel.com>
This commit is contained in:
Tw 2019-05-31 15:35:36 +08:00 committed by wenlingz
parent b98096ea06
commit 857e6c0415
1 changed files with 12 additions and 3 deletions
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15
devicemodel/hw/pci/passthrough.c
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@ -574,13 +574,22 @@ cfginitbar(struct vmctx *ctx, struct passthru_dev *ptdev)
if (bartype != PCIBAR_IO) { if (bartype != PCIBAR_IO) {
/* note here PAGE_MASK is 0xFFFFF000 */ /* note here PAGE_MASK is 0xFFFFF000 */
if (((base | size) & ~PAGE_MASK) != 0) { if ((base & ~PAGE_MASK) != 0) {
warnx("passthru device %x/%x/%x BAR %d: " warnx("passthru device %x/%x/%x BAR %d: "
"base %#lx or size %#lx not page aligned\n", "base %#lx not page aligned\n",
ptdev->sel.bus, ptdev->sel.dev, ptdev->sel.bus, ptdev->sel.dev,
ptdev->sel.func, i, base, size); ptdev->sel.func, i, base);
return -1; return -1;
} }
/* roundup to PAGE_SIZE for bar size */
if ((size & ~PAGE_MASK) != 0) {
warnx("passthru device %x/%x/%x BAR %d: "
"size[%lx] is expanded to page aligned [%lx]\n",
ptdev->sel.bus, ptdev->sel.dev,
ptdev->sel.func, i, size, roundup2(size, PAGE_SIZE));
size = roundup2(size, PAGE_SIZE);
}
} }
/* Cache information about the "real" BAR */ /* Cache information about the "real" BAR */