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6f0f23ef76
Add support for the IBPB_BRTYPE CPUID flag, which indicates that IBPB includes branch type prediction flushing. Note, like SRSO_NO, advertise support for IBPB_BRTYPE even if it's not enumerated by in the raw CPUID, i.e. bypass the cpuid_count() in __kvm_cpu_cap_mask(). Some CPUs that gained support via a uCode patch don't report IBPB_BRTYPE via CPUID (the kernel forces the flag). Opportunistically use kvm_cpu_cap_check_and_set() for SRSO_NO instead of manually querying host support (cpu_feature_enabled() and boot_cpu_has() yield the same end result in this case). Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Link: https://lore.kernel.org/r/79d5f5914fb42c2c62418ffbcd78f138645ded21.1692919072.git.jpoimboe@kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com>
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.