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x86/cpu/vfm: Add/initialize x86_vfm field to struct cpuinfo_x86
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
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1 changed files with 17 additions and 3 deletions
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@ -108,9 +108,23 @@ struct cpuinfo_topology {
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};
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struct cpuinfo_x86 {
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__u8 x86; /* CPU family */
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__u8 x86_vendor; /* CPU vendor */
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__u8 x86_model;
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union {
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/*
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* The particular ordering (low-to-high) of (vendor,
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* family, model) is done in case range of models, like
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* it is usually done on AMD, need to be compared.
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*/
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struct {
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__u8 x86_model;
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/* CPU family */
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__u8 x86;
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/* CPU vendor */
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__u8 x86_vendor;
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__u8 x86_reserved;
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};
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/* combined vendor, family, model */
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__u32 x86_vfm;
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};
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__u8 x86_stepping;
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#ifdef CONFIG_X86_64
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/* Number of 4K pages in DTLB/ITLB combined(in pages): */
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