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Re: Xen MP panics in cpu_switchto()
On Mon, Jan 13, 2020 at 05:43:51PM +0100, Manuel Bouyer wrote:
> On Mon, Jan 13, 2020 at 04:59:50PM +0100, Manuel Bouyer wrote:
> > It also sets rsp and rbp. I think rbp is not set by anything else, at last
> > in the Xen case.
> > The different rbp value would explain why in one case we hit a KASSERT()
> > in lwp_startup later.
> > But I don't know what pcb_rbp contains; I couldn't find where the pcb for
> > idlelwp is initialized.
> I tried the attached patch, which should set rsp/rbp as cpu_switchto()
> does. It doens't cause the lwp_startup() KASSERT as calling cpu_switchto()
> does; it also doesn't change the scheduler behavior.
Wait - do you mean that everything works now? Or that everything still runs
The very first thing that idle_loop() does on amd64/i386 is set up the frame
pointer - ebp/rbp.
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 41 56 push %r14
6: 41 55 push %r13
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