• Boris Ostrovsky's avatar
    x86/xen: Fix 32-bit PV guests's usage of kernel_stack · 4461bbc0
    Boris Ostrovsky authored
    Commit 198d208d ("x86: Keep
    thread_info on thread stack in x86_32") made 32-bit kernels use
    kernel_stack to point to thread_info. That change missed a couple of
    updates needed by Xen's 32-bit PV guests:
    
    1. kernel_stack needs to be initialized for secondary CPUs
    
    2. GET_THREAD_INFO() now uses %fs register which may not be the
       kernel's version when executing xen_iret().
    
    With respect to the second issue, we don't need GET_THREAD_INFO()
    anymore: we used it as an intermediate step to get to per_cpu xen_vcpu
    and avoid referencing %fs. Now that we are going to use %fs anyway we
    may as well go directly to xen_vcpu.
    Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
    Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
    4461bbc0
xen-asm_32.S 6.7 KB