Hi all, This v3 of the nVHE hypervisor stack unwinder. The previous versions were posted at: v2: https://lore.kernel.org/r/20220502191222.4192768-1-kaleshsingh@xxxxxxxxxx/ v1: https://lore.kernel.org/r/20220427184716.1949239-1-kaleshsingh@xxxxxxxxxx/ The version is rebased on 5.19-rc1 which resolves the previously unmerged dependencies, and adds some reviewed tags from Mark Brown. The cover letter are copied below for convenience. Thanks, Kalesh ------- This new version of the unwinder splits the unwinding and dumping of the stack between the hypervisor and host: - The hypervisor unwinds its stack and dumps the address entries into a page shared with the host. - The host then symnolizes and prints the hyp stacktrace from the shared page. The new approach doesn't depend on CONFIG_NVHE_EL2_DEBUG, and allows dumping hyp stacktraces in prodcution environments (!CONFIG_NVHE_EL2_DEBUG). arm64/kernel/stacktrace.c is compiled twice: stacktrace.o for the host kernel and stacktrace.nvhe.o for the hypervisor. This allows reusing most of the host unwinding logic in the nVHE hypervisor. Kalesh Singh (5): KVM: arm64: Factor out common stack unwinding logic KVM: arm64: Compile stacktrace.nvhe.o KVM: arm64: Add hypervisor overflow stack KVM: arm64: Allocate shared stacktrace pages KVM: arm64: Unwind and dump nVHE hypervisor stacktrace arch/arm64/include/asm/kvm_asm.h | 1 + arch/arm64/include/asm/stacktrace.h | 58 +++++++++-- arch/arm64/kernel/stacktrace.c | 151 +++++++++++++++++++++++----- arch/arm64/kvm/arm.c | 34 +++++++ arch/arm64/kvm/handle_exit.c | 4 + arch/arm64/kvm/hyp/nvhe/Makefile | 3 +- arch/arm64/kvm/hyp/nvhe/host.S | 9 +- arch/arm64/kvm/hyp/nvhe/setup.c | 11 ++ arch/arm64/kvm/hyp/nvhe/switch.c | 4 + 9 files changed, 231 insertions(+), 44 deletions(-) base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56 -- 2.36.1.255.ge46751e96f-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
