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The feature allows the > hypervisor to determine if the vCPU is actually idle and reduces > wasteful VMEXITs. > > The Idle HLT intercept feature is used for enlightened guests who wish > to securely handle the events. When an enlightened guest does a HLT > while an interrupt is pending, hypervisor will not have a way to > figure out whether the guest needs to be re-entered or not. The Idle > HLT intercept feature allows the HLT execution only if there are no > pending V_INTR and V_NMI events. > > Presence of the Idle HLT Intercept feature is indicated via CPUID > function Fn8000_000A_EDX[30]. > > Document for the Idle HLT intercept feature is available at [1]. > > This series is based on kvm-x86/next (13e98294d7ce) + [2] + [3]. > > Testing Done: > - Tested the functionality for the Idle HLT intercept feature > using selftest ipi_hlt_test. > - Tested on normal, SEV, SEV-ES, SEV-SNP guest for the Idle HLT intercept > functionality. > - Tested the Idle HLT intercept functionality on nested guest. > > v4 -> v5 > - Incorporated Sean's review comments on nested Idle HLT intercept support. > - Make svm_idle_hlt_test independent of the Idle HLT to run on all hardware. > > v3 -> v4 > - Drop the patches to add vcpu_get_stat() into a new series [2]. > - Added nested Idle HLT intercept support. > > v2 -> v3 > - Incorporated Andrew's suggestion to structure vcpu_stat_types in > a way that each architecture can share the generic types and also > provide its own. > > v1 -> v2 > - Done changes in svm_idle_hlt_test based on the review comments from Sean. > - Added an enum based approach to get binary stats in vcpu_get_stat() which > doesn't use string to get stat data based on the comments from Sean. > - Added safe_halt() and cli() helpers based on the comments from Sean. > > [1]: AMD64 Architecture Programmer's Manual Pub. 24593, April 2024, > Vol 2, 15.9 Instruction Intercepts (Table 15-7: IDLE_HLT). > https://bugzilla.kernel.org/attachment.cgi?id=306250 > > [2]: https://lore.kernel.org/kvm/20241220013906.3518334-1-seanjc@google.com/T/#u > > [3]: https://lore.kernel.org/kvm/20241220012617.3513898-1-seanjc@google.com/T/#u > > --- > > V4: https://lore.kernel.org/kvm/20241022054810.23369-1-manali.shukla@amd.com/ > V3: https://lore.kernel.org/kvm/20240528041926.3989-4-manali.shukla@amd.com/T/ > V2: https://lore.kernel.org/kvm/20240501145433.4070-1-manali.shukla@amd.com/ > V1: https://lore.kernel.org/kvm/20240307054623.13632-1-manali.shukla@amd.com/ > > Manali Shukla (3): > x86/cpufeatures: Add CPUID feature bit for Idle HLT intercept > KVM: SVM: Add Idle HLT intercept support > KVM: selftests: Add self IPI HLT test > > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/include/asm/svm.h | 1 + > arch/x86/include/uapi/asm/svm.h | 2 + > arch/x86/kvm/svm/svm.c | 13 ++- > tools/testing/selftests/kvm/Makefile.kvm | 1 + > .../selftests/kvm/include/x86/processor.h | 1 + > tools/testing/selftests/kvm/ipi_hlt_test.c | 85 +++++++++++++++++++ > 7 files changed, 101 insertions(+), 3 deletions(-) > create mode 100644 tools/testing/selftests/kvm/ipi_hlt_test.c > > > base-commit: 13e98294d7cec978e31138d16824f50556a62d17 > prerequisite-patch-id: cb345fc0d814a351df2b5788b76eee0eef9de549 > prerequisite-patch-id: 71806f400cffe09f47d6231cb072cbdbd540de1b > prerequisite-patch-id: 9ea0412aab7ecd8555fcee3e9609dbfe8456d47b > prerequisite-patch-id: 3504df50cdd33958456f2e56139d76867273525c > prerequisite-patch-id: 674e56729a56cc487cb85be1a64ef561eb7bac8a > prerequisite-patch-id: 48e87354f9d6e6bd121ca32ab73cd0d7f1dce74f > prerequisite-patch-id: 74daffd7677992995f37e5a5cb784b8d4357e342 > prerequisite-patch-id: 509018dc2fc1657debc641544e86f5a92d04bc1a > prerequisite-patch-id: 4a50c6a4dc3b3c8c8c640a86072faafb7bae4384 A gentle reminder for the review. -Manali