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c8f808231f
XEN/PV has a completely broken vCPU enumeration scheme, which just works by chance and provides zero topology information. Each vCPU ends up being a single core package. Dom0 provides MADT which can be used for topology information, but that table is the unmodified host table, which means that there can be more CPUs registered than the number of vCPUs XEN provides for the dom0 guest. DomU does not have ACPI and both rely on counting the possible vCPUs via an hypercall. To prepare for using CPUID topology information either via MADT or via fake APIC IDs count the number of possible CPUs during early boot and adjust nr_cpu_ids() accordingly. 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/20240213210252.571795063@linutronix.de
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _XEN_SMP_H
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#ifdef CONFIG_SMP
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void asm_cpu_bringup_and_idle(void);
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asmlinkage void cpu_bringup_and_idle(void);
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extern void xen_send_IPI_mask(const struct cpumask *mask,
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int vector);
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extern void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
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int vector);
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extern void xen_send_IPI_allbutself(int vector);
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extern void xen_send_IPI_all(int vector);
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extern void xen_send_IPI_self(int vector);
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extern int xen_smp_intr_init(unsigned int cpu);
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extern void xen_smp_intr_free(unsigned int cpu);
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int xen_smp_intr_init_pv(unsigned int cpu);
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void xen_smp_intr_free_pv(unsigned int cpu);
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void xen_smp_count_cpus(void);
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void xen_smp_cpus_done(unsigned int max_cpus);
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void xen_smp_send_reschedule(int cpu);
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void xen_smp_send_call_function_ipi(const struct cpumask *mask);
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void xen_smp_send_call_function_single_ipi(int cpu);
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void __noreturn xen_cpu_bringup_again(unsigned long stack);
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struct xen_common_irq {
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int irq;
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char *name;
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};
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#else /* CONFIG_SMP */
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static inline int xen_smp_intr_init(unsigned int cpu)
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{
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return 0;
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}
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static inline void xen_smp_intr_free(unsigned int cpu) {}
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static inline int xen_smp_intr_init_pv(unsigned int cpu)
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{
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return 0;
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}
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static inline void xen_smp_intr_free_pv(unsigned int cpu) {}
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static inline void xen_smp_count_cpus(void) { }
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#endif /* CONFIG_SMP */
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#endif
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