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Re: [PATCH v1 3/7] xen/monitor: wrap monitor_op under CONFIG_VM_EVENT
- To: Penny Zheng <Penny.Zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 13 Nov 2025 10:18:07 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 13 Nov 2025 09:18:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.11.2025 04:16, Penny Zheng wrote:
> Feature monitor_op is based on vm event subsystem, so monitor.o shall be
> wrapped under CONFIG_VM_EVENT.
> The following functions are only invoked by monitor-op, 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_enable_msr_interception
> - hvm_function_table.enable_msr_interception
> - hvm_has_set_descriptor_access_existing
> - hvm_function_table.set_descriptor_access_existi
> - arch_monitor_get_capabilities
> Function monitored_msr() still needs a stub to pass compilation when
> VM_EVENT=n.
>
> Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
> ---
> v3 -> v4:
> - a new commit split from previous "xen/vm_event: consolidate CONFIG_VM_EVENT"
> - Another blank line ahead of the #ifdef
> - Move hvm_enable_msr_interception() up into the earlier #ifdef
> - only arch_monitor_get_capabilities() needs wrapping, as this static inline
> function calls hvm_has_set_descriptor_access_exiting(), which is declared only
> when VM_EVENT=y
> ---
> xen/arch/x86/hvm/Makefile | 2 +-
> xen/arch/x86/hvm/svm/svm.c | 8 +++++++-
> xen/arch/x86/hvm/vmx/vmx.c | 10 ++++++++++
> xen/arch/x86/include/asm/hvm/hvm.h | 18 +++++++++++-------
> xen/arch/x86/include/asm/monitor.h | 9 +++++++++
> 5 files changed, 38 insertions(+), 9 deletions(-)
Same remark as for patch 2 regarding the subject prefix. Then
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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