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Sean Christopherson c829ccd4d9 KVM: x86: Reject disabling of MWAIT/HLT interception when not allowed
Reject KVM_CAP_X86_DISABLE_EXITS if userspace attempts to disable MWAIT or
HLT exits and KVM previously reported (via KVM_CHECK_EXTENSION) that
disabling the exit(s) is not allowed.  E.g. because MWAIT isn't supported
or the CPU doesn't have an always-running APIC timer, or because KVM is
configured to mitigate cross-thread vulnerabilities.

Cc: Kechen Lu <kechenl@nvidia.com>
Fixes: 4d5422cea3 ("KVM: X86: Provide a capability to disable MWAIT intercepts")
Fixes: 6f0f2d5ef8 ("KVM: x86: Mitigate the cross-thread return address predictions bug")
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20241128013424.4096668-15-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
History 2024-12-18 14:19:36 -08:00
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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.