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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Zs1I1KGgTCxUnnPQttcRx5WhLeboTwTJOh8uPJ/LmKdXkvsMa9Tjr0G6+SXfa3qYtHfcEUgkh7LWOYQvky+t/NtsiFzqYPrOlBc0r1gClAKJwYE840MWnyU5O3zTFSwxCib4pVDaLknzBcK1EvurC+0StfAfuZcNUMSkNW3+iVU/1Nr1RzF1ZiCP1DKPpHC9pmX0HURZrNuuIb4jwRukFLg6PgGP9/x96K72Ah94HOhhd2PcsiYJM+6KExZUkvQbCXFBj+n0iStztTEkmudySQOeOgZlcIH0/xMXiXtJjDfy9xVL4FKYxnfp4EV8IbMPJMQZk3P2CpueqKrYasiVoQZnPsxFtNoKTv3i9+mN21DPycpCTFYfbVIS0E3fhNpwkREeYgKUpzKefsNgBIRGLMy0frG/0X6J9vV5GUh22PArs3YgBQ9+daxE1SjYXHmt X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 May 2026 04:59:40.6278 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 75e7b6c4-44ba-4f05-77a8-08deb49a44e0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A0F9.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4159 This series implements Page Modification Logging (PML) for guests on select AMD Zen6 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 AMD64 Page Modification Logging specification [1]. 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. [1] https://docs.amd.com/v/u/en-US/69208_1.00_AMD64_PML_PUB Changelog: v7: * Swap patch order to avoid adding @pml_page parameter only to remove it (Sean) * Add Sean's prep patch to pass @vcpu to init_vmcs() instead of @vmx, cleaning up all vmx->vcpu usage (Sean) * Drop guard(svm_vmcb01) patch; access vmcb01 directly in svm_update_cpu_dirty_logging() since VMCB is just memory (Sean, Yosry) * Only initialize PML index on reset, leave unchanged on INIT to avoid discarding unflushed entries. PML_INDEX in the control area remains valid after intercepted SHUTDOWN (Sashiko, Sean, Kai) v6: https://lore.kernel.org/kvm/20260407063245.2755579-1-nikunj@amd.com/ * Collect RoBs * Rebase on latest kvm/master * Dropped SEV PML selftest (Kai Huang) * Added guard(svm_vmcb01) helpers to temporarily switch to vmcb01 * Use guard(svm_vmcb01) to ensure vmcb01 is targeted during PML updates when L2 is active, similar to VMX. Dropped patch moving nested CPU dirty logging to common code; upstream now updates vmcs01 on-demand via temporary VMCS switch instead of deferring updates. Nikunj A Dadhania (6): KVM: x86: Move PML page to common vcpu arch structure KVM: x86: Carve out PML flush routine KVM: VMX: Use cpu_dirty_log_size instead of enable_pml for PML checks x86/cpufeatures: Add Page modification logging KVM: SVM: Use BIT_ULL for 64-bit misc_ctl bit definitions KVM: SVM: Add Page modification logging support Sean Christopherson (1): KVM: VMX: Pass @vcpu, not @vmx to init_vmcs() arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/kvm_host.h | 2 + arch/x86/include/asm/svm.h | 14 ++-- arch/x86/include/uapi/asm/svm.h | 2 + arch/x86/kernel/cpu/scattered.c | 1 + arch/x86/kvm/svm/nested.c | 6 ++ arch/x86/kvm/svm/sev.c | 2 +- arch/x86/kvm/svm/svm.c | 108 ++++++++++++++++++++++++++++- arch/x86/kvm/svm/svm.h | 3 + arch/x86/kvm/vmx/vmx.c | 72 +++++++------------ arch/x86/kvm/vmx/vmx.h | 7 -- arch/x86/kvm/x86.c | 31 +++++++++ arch/x86/kvm/x86.h | 8 +++ 13 files changed, 195 insertions(+), 62 deletions(-) base-commit: a9512a611bd030088f13477258d1f8103cceaa40 -- 2.48.1