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e3d1f2826d
Gate access to PMC MSRs based on pmu->version, not on kvm->arch.enable_pmu, to more accurately reflect KVM's behavior. This is a glorified nop, as pmu->version and pmu->nr_arch_gp_counters can only be non-zero if amd_pmu_refresh() is reached, kvm_pmu_refresh() invokes amd_pmu_refresh() if and only if kvm->arch.enable_pmu is true, and amd_pmu_refresh() forces pmu->version to be 1 or 2. I.e. the following holds true: !pmu->nr_arch_gp_counters || kvm->arch.enable_pmu == (pmu->version > 0) and so the only way for amd_pmu_get_pmc() to return a non-NULL value is if both kvm->arch.enable_pmu and pmu->version evaluate to true. No real functional change intended. Reviewed-by: Sandipan Das <sandipan.das@amd.com> Tested-by: Xudong Hao <xudong.hao@intel.com> Link: https://lore.kernel.org/r/20250806195706.1650976-16-seanjc@google.com 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 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.