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Sean Christopherson 448b116577 KVM: x86/pmu: Gate all "unimplemented MSR" prints on report_ignored_msrs 
[ Upstream commit e76ae52747 ]

Add helpers to print unimplemented MSR accesses and condition all such
prints on report_ignored_msrs, i.e. honor userspace's request to not
print unimplemented MSRs.  Even though vcpu_unimpl() is ratelimited,
printing can still be problematic, e.g. if a print gets stalled when host
userspace is writing MSRs during live migration, an effective stall can
result in very noticeable disruption in the guest.

E.g. the profile below was taken while calling KVM_SET_MSRS on the PMU
counters while the PMU was disabled in KVM.

  -   99.75%     0.00%  [.] __ioctl
   - __ioctl
      - 99.74% entry_SYSCALL_64_after_hwframe
           do_syscall_64
           sys_ioctl
         - do_vfs_ioctl
            - 92.48% kvm_vcpu_ioctl
               - kvm_arch_vcpu_ioctl
                  - 85.12% kvm_set_msr_ignored_check
                       svm_set_msr
                       kvm_set_msr_common
                       printk
                       vprintk_func
                       vprintk_default
                       vprintk_emit
                       console_unlock
                       call_console_drivers
                       univ8250_console_write
                       serial8250_console_write
                       uart_console_write

Reported-by: Aaron Lewis <aaronlewis@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20230124234905.3774678-3-seanjc@google.com
Stable-dep-of: 7d0cce6cbe ("KVM: VMX: Wrap all accesses to IA32_DEBUGCTL with getter/setter APIs")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-28 16:25:49 +02:00
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README 

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.