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Mon, 16 Feb 2026 03:56:43 -0800 (PST) Message-ID: <561865f9-cd0f-40c9-86b8-98a3ac070b65@suse.com> Date: Mon, 16 Feb 2026 12:56:45 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= From: Jan Beulich Subject: [PATCH] x86/MCE: restore CPU vendor reporting to the outside world Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1771243038585154100 Content-Type: text/plain; charset="utf-8" The records reported used to contain Linux enumerators. We first broke that connection when purging unused ones, and then again when switching to the bit mask forms. Fixes: 408413051144 ("x86/cpu: Drop unused X86_VENDOR_* values") Fixes: 0cd074144cbb ("x86/cpu: Renumber X86_VENDOR_* to form a bitmap") Signed-off-by: Jan Beulich Reviewed-by: Jason Andryuk --- a/xen/arch/x86/cpu/mcheck/mce.c +++ b/xen/arch/x86/cpu/mcheck/mce.c @@ -858,6 +858,22 @@ void *x86_mcinfo_reserve(struct mc_info return mic_index; } =20 +/* Linux values need using when reporting CPU vendors to the outside. */ +static unsigned int xen2linux_vendor(unsigned int vendor) +{ + switch ( vendor ) + { + case X86_VENDOR_INTEL: return 0; + case X86_VENDOR_AMD: return 2; + case X86_VENDOR_CENTAUR: return 5; + case X86_VENDOR_HYGON: return 9; + case X86_VENDOR_SHANGHAI: return 10; /* X86_VENDOR_ZHAOXIN */ + default: break; + } + + return 0xff; /* X86_VENDOR_UNKNOWN */ +} + static void x86_mcinfo_apei_save( struct mcinfo_global *mc_global, struct mcinfo_bank *mc_bank) { @@ -866,7 +882,7 @@ static void x86_mcinfo_apei_save( memset(&m, 0, sizeof(struct mce)); =20 m.cpu =3D mc_global->mc_coreid; - m.cpuvendor =3D boot_cpu_data.x86_vendor; + m.cpuvendor =3D xen2linux_vendor(boot_cpu_data.x86_vendor); m.cpuid =3D cpuid_eax(1); m.socketid =3D mc_global->mc_socketid; m.apicid =3D mc_global->mc_apicid; @@ -968,7 +984,7 @@ static void cf_check __maybe_unused do_m &xcp->mc_ncores_active, &xcp->mc_nthreads); xcp->mc_cpuid_level =3D c->cpuid_level; xcp->mc_family =3D c->x86; - xcp->mc_vendor =3D c->x86_vendor; + xcp->mc_vendor =3D xen2linux_vendor(c->x86_vendor); xcp->mc_model =3D c->x86_model; xcp->mc_step =3D c->x86_mask; xcp->mc_cache_size =3D c->x86_cache_size;