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devices: Add userspace IOAPIC implementation

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The goal for cloud-hypervisor is to keep the host safe. With this in
mind, we want to emulate as much as possible in userspace instead of
in kernel directly.

The IOAPIC is a good candidate to move from kernel to userspace, which
is why this commit introduces a userspace implementation of the IOAPIC
82093AA based on the documentation:
https://pdos.csail.mit.edu/6.828/2016/readings/ia32/ioapic.pdf

This code is inspired from the files devices/src/ioapic.rs and
devices/src/split_irqchip_common.rs from the crosvm codebase. The
reference version used being 6c1e23eee3065b3f3d6fc4fb992ac9884dbabf68.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2019-06-12 01:12:45 -07:00
committed by Samuel Ortiz
parent c8c4a4d444
commit 950bd205c6
3 changed files with 354 additions and 1 deletions
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devices/Cargo.toml
+3
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@@ -6,7 +6,10 @@ authors = ["The Chromium OS Authors"]
[dependencies]
byteorder = ">=1.2.1"
epoll = "=4.0.1"
kvm-bindings = "0.1"
kvm-ioctls = { git = "https://github.com/rust-vmm/kvm-ioctls", branch = "master" }
libc = ">=0.2.39"
log = "*"
vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
vmm-sys-util = { git = "https://github.com/rust-vmm/vmm-sys-util" }