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pci: vfio: naturally align bar

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According to PCIe specification, a 64-bit MMIO BAR should be
naturally aligned. In addition to being more compliant with
the specification, natural aligned BARs are mapped with
the largest possible page size by the host iommu driver, which
should speed up boot time and reduce IOTLB thrashing for virtual
machines with VFIO devices.

Signed-off-by: Thomas Barrett <tbarrett@crusoeenergy.com>
This commit is contained in:
Thomas Barrett 2024-02-14 20:26:07 +00:00 committed by Rob Bradford
parent af49b10cf2
commit c9f94be7ab
1 changed files with 5 additions and 2 deletions
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7
pci/src/vfio.rs
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@ -696,8 +696,11 @@ impl VfioCommon {
.allocate(
restored_bar_addr,
region_size,
// SAFETY: FFI call. Trivially safe.
Some(unsafe { sysconf(_SC_PAGESIZE) as GuestUsize }),
Some(std::cmp::max(
// SAFETY: FFI call. Trivially safe.
unsafe { sysconf(_SC_PAGESIZE) as GuestUsize },
region_size,
)),
)
.ok_or(PciDeviceError::IoAllocationFailed(region_size))?
}