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pci: vfio: Mmap region based on capabilities

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Now that vfio-ioctls correctly exposes the list of capabilities related
to each region, Cloud Hypervisor can decide to mmap a region based on
the presence or absence of MSIX_MAPPABLE. Instead of blindly mmap'ing
the region, we check if the MSI-X table or PBA is present on the BAR,
and if that's the case, we look for MSIX_MAPPABLE.
If MSIX_MAPPABLE is present, we can go ahead and mmap the entire region.
If MSIX_MAPPABLE is not present, we simply ignore the mmap'ing of this
region as it wouldn't be supported.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2021-10-29 14:09:26 +02:00
parent 436f3605e9
commit b11a8a5ab5
3 changed files with 23 additions and 9 deletions
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Cargo.lock generated
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@@ -1150,7 +1150,7 @@ dependencies = [
[[package]]
name = "vfio-ioctls"
version = "0.1.0"
source = "git+https://github.com/rust-vmm/vfio-ioctls?branch=main#adbc9444387a9276e568fd2e31ed19bd0cd96611"
source = "git+https://github.com/rust-vmm/vfio-ioctls?branch=main#8f7f2210ebe71660938b05b2ed7eec9253478bc5"
dependencies = [
"byteorder",
"kvm-bindings",