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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>
(cherry picked from commit c9f94be7ab996e63400c649f47a7809655be7309)
This commit is contained in:
Thomas Barrett 2024-02-14 20:26:07 +00:00 committed by Bo Chen
parent ed1b415bad
commit b0dd4e72c5
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))?
}