The upcoming new Idle HLT Intercept feature allows for the HLT instruction execution by a vCPU to be intercepted by the hypervisor only if there are no pending V_INTR and V_NMI events for the vCPU. When the vCPU is expected to service the pending V_INTR and V_NMI events, the Idle HLT intercept won’t trigger. 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