Hi, These are fixes for guest debug when running under KVM. While re-spinning these I came across an anomaly which pointed to a kernel bug that caused the 1st single-step to fail. This is being discussed on the kvm-arm list:
Subject: [RFC PATCH] KVM: arm64: don't single-step for non-emulated faults Date: Wed, 7 Nov 2018 17:10:31 +0000 Message-Id: <20181107171031.22573-1-alex.ben...@linaro.org> As debugging HYP mode code is next to impossible on real hardware I tried re-creating the single-step bug under TCG. As a result I ran into some debug and EL2 cases that failed. The final two patches are some fixes but I'm still seeing some weird behaviour although it is currently obscured by timer interrupts constantly firing as I enter the to be single-stepped guest EL1 instruction so they can probably be skipped for 3.1. Alex Bennée (6): target/arm64: properly handle DBGVR RESS bits target/arm64: hold BQL when calling do_interrupt() target/arm64: kvm debug set target_el when passing exception to guest tests/guest-debug: fix scoping of failcount arm: use symbolic MDCR_TDE in arm_debug_target_el arm: fix aa64_generate_debug_exceptions to work with EL2 target/arm/cpu.h | 29 ++++++++++++++++++----------- target/arm/kvm64.c | 20 ++++++++++++++++++-- tests/guest-debug/test-gdbstub.py | 1 + 3 files changed, 37 insertions(+), 13 deletions(-) -- 2.17.1
