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298be81446
In order to replicate the ACPI notification from the host to the guest
pass-through devices:
1) allocate GPE and eventfd per pci-vfio device
2) generate proper aml code for ACPI GPE handler. The example of generated aml:
Scope (_GPE)
{
Method (_E00, 0, NotSerialized) // _Exx: Edge-Triggered GPE, xx=0x00-0xFF
{
Local0 = \_SB.PC00.PE08.NOTY
Notify (\_SB.PC00.PE08, Local0)
}
}
The eventfd is registered by host kernel via VFIO_DEVICE_SET_IRQS
ioctl. Crosvm upon receiving early provided, per pci-vfio eventfd,
stores the notification value and triggers GPE associated to pci-vfio
device.
Guest kernel upon handling GPE (thanks to generated aml [ad 2)],
triggers Notify on required pass-through device and therefore replicates
the ACPI Notification on the guest side [Accessing \_SB.PC00.PE08.NOTY
pointed by VCFG opregion result with trap to crosvm, which returns
previously stored notify value].
Kernel counterpart: CL:4538472
BUG=b:244205651
TEST=Observe replication of ACPI notification in the guest kernel
Change-Id: Iaf66097acd84f3066f6ff70d382f83ecaeea9a00
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4538483
Commit-Queue: Grzegorz Jaszczyk <jaszczyk@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
66 lines
1.8 KiB
Bash
Executable file
66 lines
1.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Copyright 2022 The ChromiumOS Authors
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Regenerate vfio_sys bindgen bindings.
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set -euo pipefail
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cd "$(dirname "${BASH_SOURCE[0]}")/.."
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source tools/impl/bindgen-common.sh
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# VFIO_TYPE is translated as a u8 since it is a char constant, but it needs to be u32 for use in
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# ioctl macros.
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fix_vfio_type() {
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sed -E -e 's/^pub const VFIO_TYPE: u8 = (.*)u8;/pub const VFIO_TYPE: u32 = \1;/'
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}
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VFIO_EXTRA="// Added by vfio_sys/bindgen.sh
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use zerocopy::AsBytes;
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use zerocopy::FromBytes;
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#[repr(C)]
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#[derive(Debug, Default)]
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pub struct vfio_acpi_dsm {
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pub argsz: u32,
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pub padding: u32,
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pub args: __IncompleteArrayField<u8>,
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}
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#[repr(C)]
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#[derive(Debug, Default, Copy, Clone)]
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pub struct vfio_acpi_notify_eventfd {
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pub notify_eventfd: i32,
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pub reserved: u32,
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}
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#[repr(C)]
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#[derive(Debug, Default)]
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pub struct vfio_region_info_with_cap {
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pub region_info: vfio_region_info,
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pub cap_info: __IncompleteArrayField<u8>,
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}
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// vfio_iommu_type1_info_cap_iova_range minus the incomplete iova_ranges
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// array, so that Copy/AsBytes/FromBytes can be implemented.
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#[repr(C)]
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#[derive(Debug, Default, Copy, Clone, AsBytes, FromBytes)]
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pub struct vfio_iommu_type1_info_cap_iova_range_header {
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pub header: vfio_info_cap_header,
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pub nr_iovas: u32,
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pub reserved: u32,
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}"
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bindgen_generate \
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--raw-line "${VFIO_EXTRA}" \
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--allowlist-var='VFIO_.*' \
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--blocklist-item='VFIO_DEVICE_API_.*_STRING' \
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--allowlist-type='vfio_.*' \
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--with-derive-custom "vfio_info_cap_header=FromBytes,AsBytes" \
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--with-derive-custom "vfio_iova_range=FromBytes,AsBytes" \
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"${BINDGEN_LINUX}/include/uapi/linux/vfio.h" \
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-- \
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-D__user= \
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| replace_linux_int_types | fix_vfio_type \
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> vfio_sys/src/vfio.rs
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