This series fixes two bugs of single-step execution enabled by userspace, and add a test case for KVM_GUESTDBG_SINGLESTEP to the debug-exception test to verify the single-step behavior. Patch 1 fixes a bug that KVM might unintentionally change PSTATE.SS for the guest when single-step execution is enabled for the vCPU by userspace. Patch 2 fixes a bug that KVM could erroneously perform an extra single step (without returning to userspace) due to setting PSTATE.SS to 1 on every guest entry, when single-step execution is enabled for the vCPU by userspace. Patch 3-4 adds a test for KVM_GUESTDBG_SINGLESTEP to the debug-exception test to verify the single-step behavior. The series is based on 6.0-rc5. v2: - Change kvm_handle_guest_debug() to use switch/case statement [Marc] - Clear PSTATE.SS on guest entry if the Software step state at the last guest exit was "Active-pending" to make DBG_SS_ACTIVE_PENDING and PSTATE.SS consistent [Marc] - Add a fix to preserve PSTATE.SS for the guest. v1: https://lore.kernel.org/all/20220909044636.1997755-1-reijiw@xxxxxxxxxx/ Reiji Watanabe (4): KVM: arm64: Preserve PSTATE.SS for the guest while single-step is enabled KVM: arm64: Clear PSTATE.SS when the Software Step state was Active-pending KVM: arm64: selftests: Refactor debug-exceptions to make it amenable to new test cases KVM: arm64: selftests: Add a test case for KVM_GUESTDBG_SINGLESTEP arch/arm64/include/asm/kvm_host.h | 4 + arch/arm64/kvm/debug.c | 34 +++- arch/arm64/kvm/guest.c | 1 + arch/arm64/kvm/handle_exit.c | 8 +- .../selftests/kvm/aarch64/debug-exceptions.c | 149 +++++++++++++++++- 5 files changed, 190 insertions(+), 6 deletions(-) base-commit: 80e78fcce86de0288793a0ef0f6acf37656ee4cf -- 2.37.3.968.ga6b4b080e4-goog
