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Re: Ping: [XEN][PATCH v4] xen: make VMTRACE support optional
- To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 4 Feb 2026 08:27:30 +0100
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- Cc: 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>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Grygorii Strashko <grygorii_strashko@xxxxxxxx>
- Delivery-date: Wed, 04 Feb 2026 07:27:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.12.2025 11:57, Jan Beulich wrote:
> On 19.11.2025 20:31, Grygorii Strashko wrote:
>> From: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
>>
>> The VMTRACE feature is depends on Platform/Arch HW and code support and now
>> can be used only on x86 HVM with Intel VT-x (INTEL_VMX) enabled.
>> This makes VMTRACE support optional by introducing HVM Kconfig option:
>> - CONFIG_VMTRACE to enable/disable the feature.
>>
>> Signed-off-by: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
>> ---
>> changes in v4:
>> - format changes
>>
>> changes in v3:
>> - drop vmtrace stubs for HVM=n case from hvm.h (VMTRACE depnds on HVM)
>> - hvm_vmtrace_reset() fix return err code
>> - add comment about using func declaration without definition
>>
>> changes in v2:
>> - fix comments from Jan Beulich
>> - move CONFIG_VMTRACE in HVM
>> - drop HAS_VMTRACE
>>
>> v3:
>>
>> https://patchwork.kernel.org/project/xen-devel/patch/20251114142207.279834-1-grygorii_strashko@xxxxxxxx/
>> v2:
>>
>> https://patchwork.kernel.org/project/xen-devel/patch/20251112202442.3879997-1-grygorii_strashko@xxxxxxxx/
>>
>> v1:
>>
>> https://patchwork.kernel.org/project/xen-devel/patch/20251031212005.1338212-1-grygorii_strashko@xxxxxxxx/
>>
>> xen/arch/x86/domctl.c | 4 +++
>> xen/arch/x86/hvm/Kconfig | 12 +++++++++
>> xen/arch/x86/hvm/vmx/vmcs.c | 2 ++
>> xen/arch/x86/hvm/vmx/vmx.c | 11 ++++++++
>> xen/arch/x86/include/asm/guest-msr.h | 2 ++
>> xen/arch/x86/include/asm/hvm/hvm.h | 36 ++++++++++---------------
>> xen/arch/x86/include/asm/hvm/vmx/vmcs.h | 2 ++
>> xen/arch/x86/mm/mem_sharing.c | 2 ++
>> xen/arch/x86/vm_event.c | 8 +++---
>> xen/common/domain.c | 10 +++++++
>> xen/common/memory.c | 6 +++++
>> xen/common/vm_event.c | 3 ++-
>> xen/include/xen/domain.h | 4 +++
>> xen/include/xen/sched.h | 4 +++
>> 14 files changed, 80 insertions(+), 26 deletions(-)
>
> Tamas - any chance of an ack here?
I guess I will time out on this early next week.
Jan
> Grygorii - chasing missing acks is generally the submitter's responsibility.
>
> Jan
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