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The current approach to nested GICv3 support is to not do anything while L2 is running, wait a transition from L2 to L1 to resync LRs, VMCR and HCR, and only then evaluate the state to decide whether to generate a maintenance interrupt. This doesn't provide a good quality of emulation, and it would be far preferable to find out early that we need to perform a switch. Move the LRs/VMCR and HCR resync into vgic_v3_sync_nested(), so that we have most of the state available. As we turning the vgic off at this stage to avoid a screaming host MI, add a new helper vgic_v3_flush_nested() that switches the vgic on again. The MI can then be directly injected as required. Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://msgid.link/20251120172540.2267180-35-maz@kernel.org Signed-off-by: Oliver Upton <oupton@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.