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Re: [PATCH v4 6/6] xen/vm_event: consolidate CONFIG_VM_EVENT
- To: Penny Zheng <Penny.Zheng@xxxxxxx>
- From: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- Date: Thu, 15 Jan 2026 18:11:00 -0500
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, jason.andryuk@xxxxxxx, ray.huang@xxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>
- Delivery-date: Thu, 15 Jan 2026 23:13:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
File hvm/vm_event.c and x86/vm_event.c are the extend to vm_event handling
routines, and its compilation shall be guarded by CONFIG_VM_EVENT too.
Although CONFIG_VM_EVENT is right now forcibly enabled on x86 via
MEM_ACCESS_ALWAYS_ON, we could disable it through disabling
CONFIG_MGMT_HYPERCALLS later. So we remove MEM_ACCESS_ALWAYS_ON and
make VM_EVENT=y on default only on x86 to retain the same.
The following functions are developed on the basis of vm event framework, or
only invoked by vm_event.c, so they all shall be wrapped with CONFIG_VM_EVENT
(otherwise they will become unreachable and
violate Misra rule 2.1 when VM_EVENT=n):
- hvm_toggle_singlestep
- hvm_fast_singlestep
- hvm_emulate_one_vm_event
- hvmemul_write{,cmpxchg,rep_ins,rep_outs,rep_movs,rep_stos,read_io,write_io}_discard
And Function vm_event_check_ring() needs stub to pass compilation when
VM_EVENT=n.
Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
Acked-by: Tamas K Lengyel < tamas@xxxxxxxxxxxxx>
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