Re: [Xen-devel] [PATCH] x86/xen: Fix 32-bit PV guests's usage of kernel_stack

[Jan Beulich]

>>> On 09.04.14 at 16:06, <boris.ostrovsky@xxxxxxxxxx> wrote:
> --- a/arch/x86/xen/xen-asm_32.S
> +++ b/arch/x86/xen/xen-asm_32.S
> @@ -88,7 +88,11 @@ ENTRY(xen_iret)
>  	 * avoid having to reload %fs
>  	 */
>  #ifdef CONFIG_SMP
> +	pushw %fs
> +	movl $(__KERNEL_PERCPU), %eax
> +	movl %eax, %fs
>  	GET_THREAD_INFO(%eax)
> +	popw %fs

I don't think it's guaranteed that this can't fault.

Jan

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