Sanitizer instrumentation of course cannot automatically update shadow
state when devices write to host memory. KMSAN thus hooks into busdma,
both to update shadow state after a device write, and to verify that the
kernel does not publish uninitalized bytes to devices.
To implement this, when KMSAN is configured, each dmamap embeds a memory
descriptor describing the region currently loaded into the map.
bus_dmamap_sync() uses the operation flags to determine whether to
validate the loaded region or to mark it as initialized in the shadow
map.
Note that in cases where the amount of data written is less than the
buffer size, the entire buffer is marked initialized even when it is
not. For example, if a NIC writes a 128B packet into a 2KB buffer, the
entire buffer will be marked initialized, but subsequent accesses past
the first 128 bytes are likely caused by bugs.
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31338
These ones were unambiguous cases where the Foundation was the only
listed copyright holder (in the associated license block).
Sponsored by: The FreeBSD Foundation
PCI memory address space is shared between memory-mapped devices (MMIO)
and host memory (which may be remapped by an IOMMU). Device accesses to
an address within a memory aperture in a PCIe root port will be treated
as peer-to-peer and not forwarded to an IOMMU. To avoid this, reserve
the address space of the root port's memory apertures in the address
space used by the IOMMU for remapping.
Reviewed by: kib, tychon
Discussed with: Anton Rang <rang@acm.org>
Tested by: tychon
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D27503
The entry->flags field is initialized in iommu_gas_init_domain().
Reviewed by: kib
Sponsored by: Innovate DSbD
Differential Revision: https://reviews.freebsd.org/D27235
This is needed on arm64 for the interface between iommu framework
and iommu controller drivers.
Reviewed by: kib
Sponsored by: Innovate DSbD
Differential Revision: https://reviews.freebsd.org/D27229
o Add iommu_unmap_msi() to release the msi GAS entry.
o Provide default implementations for iommu init/deinit methods.
Reviewed by: kib
Sponsored by: Innovate DSbD
Differential Revision: https://reviews.freebsd.org/D26906
This allows the interrupt controller driver only need a small change to
create a map for the page the device will write to raise an interrupt.
Submitted by: andrew
Reviewed by: kib
Sponsored by: Innovate DSbD
Differential Revision: https://reviews.freebsd.org/D26705
This function isn't ACPI dependent and we may use it on FDT systems
as well.
o Don't repeat the function declaration, include iommu.h instead.
Reviewed by: andrew, kib
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D26584
It could be used in various IOMMU platforms, not only DMAR.
Reviewed by: kib
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D26373
so we don't ifdef for every arch in busdma_iommu.c;
o No need to include specialreg.h for x86, remove it.
Requested by: andrew
Reviewed by: kib
Sponsored by: DARPA/AFRL
Differential Revision: https://reviews.freebsd.org/D25957
These functions were introduced before UMA started ensuring that freed
memory gets placed in domain-local caches. They no longer serve any
purpose since UMA now provides their functionality by default. Remove
them to simplyify the kernel memory allocator interfaces a bit.
Reviewed by: cem, kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25937
so x86 can support Intel DMAR and AMD IOMMU simultaneously.
Reviewed by: kib
Sponsored by: DARPA/AFRL
Differential Revision: https://reviews.freebsd.org/D25894
from Intel DMAR support, so it can be used on other IOMMU systems.
Reviewed by: kib
Sponsored by: DARPA/AFRL
Differential Revision: https://reviews.freebsd.org/D25743
