x86/cpu/vfm: Add/initialize x86_vfm field to struct cpuinfo_x86

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[ Upstream commit a9d0adce69 ]

Refactor struct cpuinfo_x86 so that the vendor, family, and model
fields are overlaid in a union with a 32-bit field that combines
all three (together with a one byte reserved field in the upper
byte).

This will make it easy, cheap, and reliable to check all three
values at once.

See

  https://lore.kernel.org/r/Zgr6kT8oULbnmEXx@agluck-desk3

for why the ordering is (low-to-high bits):

  (vendor, family, model)

  [ bp: Move comments over the line, add the backstory about the
    particular order of the fields. ]

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240416211941.9369-2-tony.luck@intel.com
Stable-dep-of: c9a4b55431 ("x86/cpu: Add Lunar Lake to list of CPUs with a broken MONITOR implementation")
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Tony Luck 2024-04-16 14:19:03 -07:00 • committed by Greg Kroah-Hartman

parent f3a3192993

commit cb3491e875

1 changed files with 17 additions and 3 deletions

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arch/x86/include/asm/processor.h

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