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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2024-06-14 12:58:49 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-17 18:45:34 +0300 |
| commit | 66e48e491d1e1a0f243ebfcb9639b23de1a5db5e (patch) | |
| tree | fa327aaabde7e3d6b6e03bacfcf51dd5dcb11266 /arch/x86/coco | |
| parent | 1037e4c53e851682ff8d1ab656567a4d5a333c93 (diff) | |
| download | linux-66e48e491d1e1a0f243ebfcb9639b23de1a5db5e.tar.xz | |
cpu/hotplug, x86/acpi: Disable CPU offlining for ACPI MADT wakeup
ACPI MADT doesn't allow to offline a CPU after it has been woken up.
Currently, CPU hotplug is prevented based on the confidential computing
attribute which is set for Intel TDX. But TDX is not the only possible user of
the wake up method. Any platform that uses ACPI MADT wakeup method cannot
offline CPU.
Disable CPU offlining on ACPI MADT wakeup enumeration.
This has no visible effects for users: currently, TDX guest is the only platform
that uses the ACPI MADT wakeup method.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Tao Liu <ltao@redhat.com>
Link: https://lore.kernel.org/r/20240614095904.1345461-5-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/coco')
| -rw-r--r-- | arch/x86/coco/core.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c index b31ef2424d19..0f81f70aca82 100644 --- a/arch/x86/coco/core.c +++ b/arch/x86/coco/core.c @@ -29,7 +29,6 @@ static bool noinstr intel_cc_platform_has(enum cc_attr attr) { switch (attr) { case CC_ATTR_GUEST_UNROLL_STRING_IO: - case CC_ATTR_HOTPLUG_DISABLED: case CC_ATTR_GUEST_MEM_ENCRYPT: case CC_ATTR_MEM_ENCRYPT: return true; |