Messages in this thread | | | Subject | Re: [PATCH v3] x86-64/Xen: fix stack switching | From | Juergen Gross <> | Date | Wed, 16 Jan 2019 12:51:20 +0100 |
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On 15/01/2019 17:58, Jan Beulich wrote: > While in the native case entry into the kernel happens on the trampoline > stack, PV Xen kernels get entered with the current thread stack right > away. Hence source and destination stacks are identical in that case, > and special care is needed. > > Other than in sync_regs() the copying done on the INT80 path isn't > NMI / #MC safe, as either of these events occurring in the middle of the > stack copying would clobber data on the (source) stack. > > I'm not altering the similar code in interrupt_entry() and nmi(), as > those code paths are unreachable afaict when running PV Xen guests. > > Fixes: 7f2590a110b837af5679d08fc25c6227c5a8c497 > Signed-off-by: Jan Beulich <jbeulich@suse.com> > Cc: stable@kernel.org
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
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