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Re: [PATCH v4 5/6] xen/mem_access: wrap memory access when VM_EVENT=n
- To: Penny Zheng <Penny.Zheng@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Thu, 15 Jan 2026 10:09:00 -0500
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- Cc: <ray.huang@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, "Alexandru Isaila" <aisaila@xxxxxxxxxxxxxxx>, Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>
- Delivery-date: Thu, 15 Jan 2026 15:21:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2026-01-15 04:28, Penny Zheng wrote:
Feature memory access is based on vm event subsystem, and it could be disabled
in the future. So a few switch-blocks in do_altp2m_op() need
vm_event_is_enabled() condition check to pass compilation when ALTP2M=y and
VM_EVENT=n(, hence MEM_ACCESS=n), like HVMOP_altp2m_set_mem_access, etc.
Function p2m_mem_access_check() still needs stub when VM_EVENT=n to
pass compilation.
Although local variable "req_ptr" still remains NULL throughout its lifetime,
with the change of NULL assignment, we will face runtime undefined error only
when CONFIG_USBAN is on. So we strengthen the condition check via adding
vm_event_is_enabled() for the special case.
Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
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