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xen: setup percpu data pointers
Impact: fix xen booting We need to access percpu data fairly early, so set up the percpu registers as soon as possible. We only need to load the appropriate segment register. We already have a GDT, but its hard to change it early because we need to manipulate the pagetable to do so, and that hasn't been set up yet. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -1647,6 +1647,9 @@ asmlinkage void __init xen_start_kernel(void)
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have_vcpu_info_placement = 0;
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#endif
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/* setup percpu state */
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load_percpu_segment(0);
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xen_smp_init();
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/* Get mfn list */
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@ -170,7 +170,8 @@ static void __init xen_smp_prepare_boot_cpu(void)
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/* We've switched to the "real" per-cpu gdt, so make sure the
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old memory can be recycled */
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make_lowmem_page_readwrite(&per_cpu_var(gdt_page));
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make_lowmem_page_readwrite(__per_cpu_load +
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(unsigned long)&per_cpu_var(gdt_page));
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xen_setup_vcpu_info_placement();
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}
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@ -235,6 +236,8 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
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ctxt->user_regs.ss = __KERNEL_DS;
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#ifdef CONFIG_X86_32
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ctxt->user_regs.fs = __KERNEL_PERCPU;
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#else
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ctxt->gs_base_kernel = per_cpu_offset(cpu);
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#endif
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ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
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ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
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