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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2009-01-30 17:47:54 +0900 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2009-01-31 14:28:58 +0900 |
| commit | 795f99b61d20c34cb04d17d8906b32f745a635ec (patch) | |
| tree | f42d20a1962fb6975025a54050bde9d7cf415b16 /arch/x86/xen/smp.c | |
| parent | 11e3a840cd5b731cdd8f6f956dfae78a8046d09c (diff) | |
| download | lwn-795f99b61d20c34cb04d17d8906b32f745a635ec.tar.gz lwn-795f99b61d20c34cb04d17d8906b32f745a635ec.zip | |
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>
Diffstat (limited to 'arch/x86/xen/smp.c')
| -rw-r--r-- | arch/x86/xen/smp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index 7735e3dd359c..88d5d5ec6beb 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -170,7 +170,8 @@ static void __init xen_smp_prepare_boot_cpu(void) /* We've switched to the "real" per-cpu gdt, so make sure the old memory can be recycled */ - make_lowmem_page_readwrite(&per_cpu_var(gdt_page)); + make_lowmem_page_readwrite(__per_cpu_load + + (unsigned long)&per_cpu_var(gdt_page)); xen_setup_vcpu_info_placement(); } @@ -235,6 +236,8 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle) ctxt->user_regs.ss = __KERNEL_DS; #ifdef CONFIG_X86_32 ctxt->user_regs.fs = __KERNEL_PERCPU; +#else + ctxt->gs_base_kernel = per_cpu_offset(cpu); #endif ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle; ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */ |