Hello,
This is RFC v2 for the TDX intra-host migration patch series. It addresses comments in RFC v1 [1] and is rebased onto the latest kvm/next (v6.16-rc1).
This patchset was built on top of the latest TDX selftests [2] and gmem linking [3] RFC patch series.
Here is the series stitched together for your convenience: https://github.com/googleprodkernel/linux-cc/tree/tdx-copyless-rfc-v2
Changes from RFC v1: + Added patch to prevent deadlock warnings by re-ordering locking order. + Added patch to allow vCPUs to be created for uninitialized VMs. + Minor optimizations to TDX intra-host migration core logic. + Moved lapic state transfer into TDX intra-host migration core logic. + Added logic to handle posted interrupts that are injected during migration. + Added selftests. + Addressed comments from RFC v1. + Various small changes to make patchset compatible with latest version of kvm/next.
[1] https://lore.kernel.org/lkml/20230407201921.2703758-2-sagis@google.com [2] https://lore.kernel.org/lkml/20250414214801.2693294-2-sagis@google.com [3] https://lore.kernel.org/all/cover.1747368092.git.afranji@google.com
Ackerley Tng (2): KVM: selftests: Add TDX support for ucalls KVM: selftests: Add irqfd/interrupts test for TDX with migration
Ryan Afranji (3): KVM: x86: Adjust locking order in move_enc_context_from KVM: TDX: Allow vCPUs to be created for migration KVM: selftests: Refactor userspace_mem_region creation out of vm_mem_add
Sagi Shahar (5): KVM: Split tdp_mmu_pages to mirror and direct counters KVM: TDX: Add base implementation for tdx_vm_move_enc_context_from KVM: TDX: Implement moving mirror pages between 2 TDs KVM: TDX: Add core logic for TDX intra-host migration KVM: selftests: TDX: Add tests for TDX in-place migration
arch/x86/include/asm/kvm_host.h | 7 +- arch/x86/kvm/mmu.h | 2 + arch/x86/kvm/mmu/mmu.c | 66 ++++ arch/x86/kvm/mmu/tdp_mmu.c | 72 +++- arch/x86/kvm/mmu/tdp_mmu.h | 6 + arch/x86/kvm/svm/sev.c | 13 +- arch/x86/kvm/vmx/main.c | 12 +- arch/x86/kvm/vmx/tdx.c | 236 +++++++++++- arch/x86/kvm/vmx/x86_ops.h | 1 + arch/x86/kvm/x86.c | 14 +- tools/testing/selftests/kvm/Makefile.kvm | 2 + .../testing/selftests/kvm/include/kvm_util.h | 25 ++ .../selftests/kvm/include/x86/tdx/tdx_util.h | 3 + .../selftests/kvm/include/x86/tdx/test_util.h | 5 + .../testing/selftests/kvm/include/x86/ucall.h | 4 +- tools/testing/selftests/kvm/lib/kvm_util.c | 222 ++++++++---- .../testing/selftests/kvm/lib/ucall_common.c | 2 +- .../selftests/kvm/lib/x86/tdx/tdx_util.c | 63 +++- .../selftests/kvm/lib/x86/tdx/test_util.c | 17 + tools/testing/selftests/kvm/lib/x86/ucall.c | 108 ++++-- .../kvm/x86/tdx_irqfd_migrate_test.c | 264 ++++++++++++++ .../selftests/kvm/x86/tdx_migrate_tests.c | 337 ++++++++++++++++++ 22 files changed, 1349 insertions(+), 132 deletions(-) create mode 100644 tools/testing/selftests/kvm/x86/tdx_irqfd_migrate_test.c create mode 100644 tools/testing/selftests/kvm/x86/tdx_migrate_tests.c