git: kernel - Workaround qemu bug w/ MSR_IA32_ARCH_CAPABILITIES

[Matthew Dillon]

commit 72953f3ec0211e11cc9081b06ce9f37e57681440
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Mon Aug 9 10:45:53 2021 -0700

    kernel - Workaround qemu bug w/ MSR_IA32_ARCH_CAPABILITIES
    
    * qemu allows cpuid report that MSR_IA32_ARCH_CAPABILITIES exists, but
      then fails to implement the MSR.  This causes the kernel to panic
      in early boot.
    
    * Use rdmsr_safe() and report the non-working msr instead of panicing.
    
    * Fixes qemu + DFly on some recent Intel cpus.
    
    refs #3292

Summary of changes:
 sys/platform/pc64/x86_64/identcpu.c   | 24 ++++++++++++++++++------
 sys/platform/pc64/x86_64/vm_machdep.c | 11 ++++++++++-
 2 files changed, 28 insertions(+), 7 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/72953f3ec0211e11cc9081b06ce9f37e57681440


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