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78c4446b5f
Allow userspace to change the guest-visible value of the register with
different way of handling:
- Since the RAS and MPAM is not writable in the ID_AA64PFR0_EL1
register, RAS_frac and MPAM_frac are also not writable in the
ID_AA64PFR1_EL1 register.
- The MTE is controlled by a separate UAPI (KVM_CAP_ARM_MTE) with an
internal flag (KVM_ARCH_FLAG_MTE_ENABLED).
So it's not writable.
- For those fields which KVM doesn't know how to handle, they are not
exposed to the guest (being disabled in the register read accessor),
those fields value will always be 0.
Those fields don't have a known behavior now, so don't advertise
them to the userspace. Thus still not writable.
Those fields include SME, RNDR_trap, NMI, GCS, THE, DF2, PFAR,
MTE_frac, MTEX.
- The BT, SSBS, CSV2_frac don't introduce any new registers which KVM
doesn't know how to handle, they can be written without ill effect.
So let them writable.
Besides, we don't do the crosscheck in KVM about the CSV2_frac even if
it depends on the value of CSV2, it should be made sure by the VMM
instead of KVM.
Signed-off-by: Shaoqin Huang <shahuang@redhat.com>
Link: https://lore.kernel.org/r/20240723072004.1470688-4-shahuang@redhat.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
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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.