Here is V5 of the KVM Guest Debug support for arm64. The changes are fairly minimal from the last round: - dropped KVM_GUESTDBG_USE_SW/HW_BP unifying patch (ABI break) - new comment patch to fix comments in hyp.S (also sent separately) - simplified singlestep code (no longer needs to preserve pstate) - don't set MDSCR_EL1.KDE (not needed) For full details see the changelog on each of the patches. GIT Repos: The patches for this series are based off v4.1-rc5 and can be found at: https://git.linaro.org/people/alex.bennee/linux.git branch: guest-debug/4.1-rc5-v5 While adding debug exception injection support into QEMU I ran into problem with GDB in the guest which relies on working single step support. So while guest SW BKPTs get delivered (and HW BKPTs if the host is not using them) GDB tends to get confused as it tries to single step. If the host isn't doing any debugging of the guest then everything works as normal. The actual solution would be to fully emulate single step in QEMU by creating a new debug event when the guest sets MDSCR_EL1.SS. QEMU would then need to ensure the correct position is reached while honouring the guests setting of MDSCR_EL1.KDE. However this would be a bunch of potentially hairy new code so I've left this as an exercise for a future patch series. https://github.com/stsquad/qemu branch: kvm/guest-debug-v5 Alex Bennée (12): KVM: add comments for kvm_debug_exit_arch struct KVM: arm64: fix misleading comments in save/restore KVM: arm64: guest debug, define API headers KVM: arm: guest debug, add stub KVM_SET_GUEST_DEBUG ioctl KVM: arm: introduce kvm_arm_init/setup/clear_debug KVM: arm64: guest debug, add SW break point support KVM: arm64: guest debug, add support for single-step KVM: arm64: re-factor hyp.S debug register code KVM: arm64: introduce vcpu->arch.debug_ptr KVM: arm64: guest debug, HW assisted debug support KVM: arm64: enable KVM_CAP_SET_GUEST_DEBUG KVM: arm64: add trace points for guest_debug debug Documentation/virtual/kvm/api.txt | 15 +- arch/arm/include/asm/kvm_host.h | 4 + arch/arm/kvm/arm.c | 46 ++- arch/arm/kvm/trace.h | 17 + arch/arm64/include/asm/hw_breakpoint.h | 12 + arch/arm64/include/asm/kvm_asm.h | 26 +- arch/arm64/include/asm/kvm_host.h | 29 +- arch/arm64/include/uapi/asm/kvm.h | 20 ++ arch/arm64/kernel/asm-offsets.c | 7 + arch/arm64/kernel/hw_breakpoint.c | 12 - arch/arm64/kvm/Makefile | 2 +- arch/arm64/kvm/debug.c | 194 ++++++++++++ arch/arm64/kvm/handle_exit.c | 44 +++ arch/arm64/kvm/hyp.S | 551 ++++++++++----------------------- arch/arm64/kvm/reset.c | 15 + arch/arm64/kvm/sys_regs.c | 136 ++++++-- arch/arm64/kvm/trace.h | 105 +++++++ include/uapi/linux/kvm.h | 5 + 18 files changed, 788 insertions(+), 452 deletions(-) create mode 100644 arch/arm64/kvm/debug.c -- 2.4.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
