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| author | Ingo Molnar <mingo@kernel.org> | 2025-04-22 08:31:41 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-04-22 08:31:41 +0200 |
| commit | c96f564e6f943cf5d8536e1c43f243aa7c42b4ed (patch) | |
| tree | ada98ccab9b31fe9519b4e6ea2beec63ad98cb16 /arch/x86/kernel/acpi/boot.c | |
| parent | 321550859f3bd64f547d0b4e9fbd97bd539ef47c (diff) | |
| parent | 06e09002bc1d46505d6b3bd947ebaf3cec7acab8 (diff) | |
Merge branch 'x86/cpu' into x86/microcode, to pick up dependent commits
Avoid a conflict in <asm/cpufeatures.h> by merging pending x86/cpu changes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/acpi/boot.c')
| -rw-r--r-- | arch/x86/kernel/acpi/boot.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index dae6a73be40e..9fa321a95eb3 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -23,6 +23,8 @@ #include <linux/serial_core.h> #include <linux/pgtable.h> +#include <xen/xen.h> + #include <asm/e820/api.h> #include <asm/irqdomain.h> #include <asm/pci_x86.h> @@ -1729,6 +1731,15 @@ int __init acpi_mps_check(void) { #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE) /* mptable code is not built-in*/ + + /* + * Xen disables ACPI in PV DomU guests but it still emulates APIC and + * supports SMP. Returning early here ensures that APIC is not disabled + * unnecessarily and the guest is not limited to a single vCPU. + */ + if (xen_pv_domain() && !xen_initial_domain()) + return 0; + if (acpi_disabled || acpi_noirq) { pr_warn("MPS support code is not built-in, using acpi=off or acpi=noirq or pci=noacpi may have problem\n"); return 1; |