linux/arch
Thomas Gleixner ff3cfcb0d4 x86/smpboot: Fix the parallel bringup decision
The decision to allow parallel bringup of secondary CPUs checks
CC_ATTR_GUEST_STATE_ENCRYPT to detect encrypted guests. Those cannot use
parallel bootup because accessing the local APIC is intercepted and raises
a #VC or #VE, which cannot be handled at that point.

The check works correctly, but only for AMD encrypted guests. TDX does not
set that flag.

As there is no real connection between CC attributes and the inability to
support parallel bringup, replace this with a generic control flag in
x86_cpuinit and let SEV-ES and TDX init code disable it.

Fixes: 0c7ffa32db ("x86/smpboot/64: Implement arch_cpuhp_init_parallel_bringup() and enable it")
Reported-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/r/87ilc9gd2d.ffs@tglx
2023-05-31 16:49:34 +02:00
..
alpha Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
arc Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
arm ARM: smp: Switch to hotplug core state synchronization 2023-05-15 13:44:57 +02:00
arm64 arm64: smp: Switch to hotplug core state synchronization 2023-05-15 13:44:57 +02:00
csky csky/smp: Switch to hotplug core state synchronization 2023-05-15 13:44:58 +02:00
hexagon Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
ia64 Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
loongarch Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
m68k Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
microblaze Kconfig: introduce HAS_IOPORT option and select it as necessary 2023-04-05 22:15:19 +02:00
mips MIPS: SMP_CPS: Switch to hotplug core state synchronization 2023-05-15 13:44:58 +02:00
nios2 - Nick Piggin's "shoot lazy tlbs" series, to improve the peformance of 2023-04-27 19:42:02 -07:00
openrisc Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
parisc parisc: Switch to hotplug core state synchronization 2023-05-15 13:44:59 +02:00
powerpc Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
riscv riscv: Switch to hotplug core state synchronization 2023-05-15 13:44:59 +02:00
s390 s390: remove the unneeded select GCC12_NO_ARRAY_BOUNDS 2023-05-05 18:56:23 -07:00
sh Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
sparc Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
um This pull request contains the following changes for UML: 2023-05-03 19:02:03 -07:00
x86 x86/smpboot: Fix the parallel bringup decision 2023-05-31 16:49:34 +02:00
xtensa Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
.gitignore
Kconfig cpu/hotplug: Allow "parallel" bringup up to CPUHP_BP_KICK_AP_STATE 2023-05-15 13:45:02 +02:00