[xen master] x86: relax some CPU checks for non-64 bit CPUs

[patchbot@xxxxxxx]

commit 28d61bb2035e7102e37d3fca9dfb4371e9c31c40
Author:     Kevin Lampis <kevin.lampis@xxxxxxxxxx>
AuthorDate: Mon Mar 23 11:14:37 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Mar 23 11:14:37 2026 +0100

    x86: relax some CPU checks for non-64 bit CPUs
    
    These checks were guarding against non-64 bit CPU models but they are
    not supported by Xen anymore so the checks are no longer needed.
    
    The switch statement was removed from mcheck_init()
    to support Intel family 18/19.
    
    Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
    Signed-off-by: Kevin Lampis <kevin.lampis@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/acpi/cpu_idle.c    | 5 ++---
 xen/arch/x86/cpu/mcheck/mce.c   | 8 +-------
 xen/arch/x86/cpu/mtrr/generic.c | 3 +--
 3 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/xen/arch/x86/acpi/cpu_idle.c b/xen/arch/x86/acpi/cpu_idle.c
index 0b3d0631dd..46749ca337 100644
--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -1059,9 +1059,8 @@ static void acpi_processor_power_init_bm_check(struct 
acpi_processor_flags *flag
      * is not required while entering C3 type state on
      * P4, Core and beyond CPUs
      */
-    if ( c->x86_vendor == X86_VENDOR_INTEL &&
-        (c->x86 > 0x6 || (c->x86 == 6 && c->x86_model >= 14)) )
-            flags->bm_control = 0;
+    if ( c->x86_vendor == X86_VENDOR_INTEL )
+        flags->bm_control = 0;
 }
 
 #define VENDOR_INTEL                   (1)
diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c
index 9a91807cfb..c4b3b687a2 100644
--- a/xen/arch/x86/cpu/mcheck/mce.c
+++ b/xen/arch/x86/cpu/mcheck/mce.c
@@ -777,13 +777,7 @@ void mcheck_init(struct cpuinfo_x86 *c, bool bsp)
 
 #ifdef CONFIG_INTEL
     case X86_VENDOR_INTEL:
-        switch ( c->x86 )
-        {
-        case 6:
-        case 15:
-            inited = intel_mcheck_init(c, bsp);
-            break;
-        }
+        inited = intel_mcheck_init(c, bsp);
         break;
 #endif
 
diff --git a/xen/arch/x86/cpu/mtrr/generic.c b/xen/arch/x86/cpu/mtrr/generic.c
index c587e9140e..0ca6a2083f 100644
--- a/xen/arch/x86/cpu/mtrr/generic.c
+++ b/xen/arch/x86/cpu/mtrr/generic.c
@@ -218,8 +218,7 @@ static void __init print_mtrr_state(const char *level)
                        printk("%s  %u disabled\n", level, i);
        }
 
-       if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
-            boot_cpu_data.x86 >= 0xf) ||
+       if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
             boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
                uint64_t syscfg, tom2;
 
--
generated by git-patchbot for /home/xen/git/xen.git#master