Re: [PATCH v8 0/8] KVM: SVM: Add Page Modification Logging (PML) support

[Nikunj A Dadhania <nikunj@amd.com>]

On 9/7/2026 12:08 PM, Nikunj A Dadhania wrote:
> This series implements Page Modification Logging (PML) for guests on select
> AMD Zen6 and later processors, bringing hardware-assisted dirty logging
> support. PML is designed to track guest modified memory pages. PML enables the> hypervisor to identify which pages in a guest's memory have been modified
> since the last checkpoint or during live migration. More details can be
> found in the latest AMD APM Volume 2 (System Programming), section
> "15.25.15 Page Modification Logging".
> 
> The PML feature uses two new VMCB fields (PML_ADDR and PML_INDEX) and
> generates a VMEXIT when the 4KB log buffer becomes full.
> 
> The feature is enabled by default when hardware support is detected and can
> be disabled via the 'pml' module parameter.
> 
> Changelog:
> v8:
> * Rebased on latest kvm/next
> * Drop redundant pml_addr=0 in nested_vmcb02_prepare_control() (Yosry)
> * Fix misleading comment, pml_index=-1 is hardening not stale-data
>   cleanup (Yosry, Sean)
> * Route nested SVM_EXIT_PML_FULL to KVM and treat it as unexpected
>   exit (Sean)
> * Refactor update_cpu_dirty_logging() to common code as a separate
>   pre-patch (Sean)
> 

Hi Sean,

A gentle ping on this series. Is there anything else you would like me
to change, or does this look reasonable for v7.4?

Regards,
Nikunj