[Xen-devel] Question re do_switch_stack()

[Avi Kivity <avi.kivity@xxxxxxxxxxxx>]

looking at do_stack_switch() (x86-32), I see that the switch is effected
by moving the new stack pointer into current->arch.kernel_sp. however,
entry.S only looks at kernel_sp in create_bounce_frame, but only if
we're not returning into ring 1.

how then is the switch caused? obviously the call to do_stack_switch
came from ring 1.

confused,
Avi

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