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| author | Thomas Gleixner <tglx@linutronix.de> | 2024-02-13 22:06:03 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-15 22:07:44 +0100 |
| commit | 090610ba704a66d7a58919be3bad195f24499ecb (patch) | |
| tree | 240519e75fbb7f210c5b9b0ae9059ee08d443812 /arch/x86/xen/smp.c | |
| parent | x86/cpu/topology: Let XEN/PV use topology from CPUID/MADT (diff) | |
| download | linux-090610ba704a66d7a58919be3bad195f24499ecb.tar.xz linux-090610ba704a66d7a58919be3bad195f24499ecb.zip | |
x86/cpu/topology: Use topology bitmaps for sizing
Now that all possible APIC IDs are tracked in the topology bitmaps, its
trivial to retrieve the real information from there.
This gets rid of the guesstimates for the maximal packages and dies per
package as the actual numbers can be determined before a single AP has been
brought up.
The number of SMT threads can now be determined correctly from the bitmaps
in all situations. Up to now a system which has SMT disabled in the BIOS
will still claim that it is SMT capable, because the lowest APIC ID bit is
reserved for that and CPUID leaf 0xb/0x1f still enumerates the SMT domain
accordingly. By calculating the bitmap weights of the SMT and the CORE
domain and setting them into relation the SMT disabled in BIOS situation
reports correctly that the system is not SMT capable.
It also handles the situation correctly when a hybrid systems boot CPU does
not have SMT as it takes the SMT capability of the APs fully into account.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Link: https://lore.kernel.org/r/20240213210252.681709880@linutronix.de
Diffstat (limited to 'arch/x86/xen/smp.c')
| -rw-r--r-- | arch/x86/xen/smp.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index 4b0d6fff88de..114b362cb7af 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -123,8 +123,6 @@ void __init xen_smp_cpus_done(unsigned int max_cpus) { if (xen_hvm_domain()) native_smp_cpus_done(max_cpus); - else - calculate_max_logical_packages(); } void xen_smp_send_reschedule(int cpu) |