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HCRX_EL2.TMEA further modifies the external abort behavior where unmasked aborts are taken to EL1 and masked aborts are taken to EL2. It's rather weird when you consider that SEAs are, well, *synchronous* and therefore not actually maskable. However, for the purposes of exception routing, they're considered "masked" if the A flag is set. This gets a bit hairier when considering the fact that TMEA also enables vSErrors, i.e. KVM has delegated the HW vSError context to the guest hypervisor. We can keep the vSError context delegation as-is by taking advantage of a couple properties: - If SErrors are unmasked, the 'physical' SError can be taken in-context immediately. In other words, KVM can emulate the EL1 SError while preserving vEL2's ownership of the vSError context. - If SErrors are masked, the 'physical' SError is taken to EL2 immediately and needs the usual nested exception entry. Note that the new in-context handling has the benign effect where unmasked SError injections are emulated even for non-nested VMs. Reviewed-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20250708172532.1699409-19-oliver.upton@linux.dev Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
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.