mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-06 10:58:48 +09:00
74347b99d4
[ Upstream commitf6da81f650] Presently, when a guest writes 1 to PMCR_EL0.{C,P}, which is WO/RAZ, KVM saves the register value, including these bits. When userspace reads the register using KVM_GET_ONE_REG, KVM returns the saved register value as it is (the saved value might have these bits set). This could result in userspace setting these bits on the destination during migration. Consequently, KVM may end up resetting the vPMU counter registers (PMCCNTR_EL0 and/or PMEVCNTR<n>_EL0) to zero on the first KVM_RUN after migration. Fix this by not saving those bits when a guest writes 1 to those bits. Fixes:ab9468340d("arm64: KVM: Add access handler for PMCR register") Cc: stable@vger.kernel.org Reviewed-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Reiji Watanabe <reijiw@google.com> Link: https://lore.kernel.org/r/20230313033234.1475987-1-reijiw@google.com Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Sasha Levin <sashal@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 Restructured Text 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.