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Re: [PATCH] x86/domain: restrict context switch hooks for the idle domain
- To: Roger Pau Monne <roger@xxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Thu, 1 Oct 2026 13:23:01 -0400
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- Cc: Grygorii Strashko <grygorii_strashko@xxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Thu, 01 Oct 2026 17:23:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2026-10-01 10:27, Roger Pau Monne wrote:
From: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
The arch_init_idle_domain() initializes struct arch_csw idle_csw as:
static const struct arch_csw idle_csw = {
.from = paravirt_ctxt_switch_from,
.to = paravirt_ctxt_switch_to,
.tail = idle_loop,
};
but only place where d->arch.ctxt_switch->{to,from}() are used is
__context_switch() where they are both guarded by !is_idle_domain(pd)
which makes the callbacks in idle_csw unreachable.
Drop to/from() callbacks initialization in idle_csw.
Signed-off-by: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
Signed-off-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
Thanks,
Jason
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