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pci: vfio: Skip IOBAR allocation on AArch64

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AArch64 does not use IOBAR, and current code of panics the whole VMM if
we need to allocate the IOBAR.

This commit checks if IOBAR is enabled before the arch conditional code
of IOBAR allocation and if the IOBAR is not enabled, we can just skip
the IOBAR allocation and do nothing.

Fixes: https://github.com/cloud-hypervisor/cloud-hypervisor/issues/3479

Signed-off-by: Henry Wang <Henry.Wang@arm.com>
This commit is contained in:
Henry Wang 2022-01-18 06:20:26 -05:00 committed by Bo Chen
parent 4ecc778efe
commit cf68f03ab6
1 changed files with 9 additions and 9 deletions
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18
pci/src/vfio.rs
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@ -411,20 +411,20 @@ impl VfioCommon {
let mut lower = vfio_wrapper.read_config_dword(bar_offset);
if io_bar {
// Mask flag bits (lowest 2 for I/O bars)
lower &= !0b11;
// BAR is not enabled
if lower == 0 {
bar_id += 1;
continue;
}
#[cfg(target_arch = "x86_64")]
{
// IO BAR
region_type = PciBarRegionType::IoRegion;
// Mask flag bits (lowest 2 for I/O bars)
lower &= !0b11;
// BAR is not enabled
if lower == 0 {
bar_id += 1;
continue;
}
// Invert bits and add 1 to calculate size
region_size = (!lower + 1) as u64;