Hi, These two patches where the start a longer series Zhichao had started to support hardware debugging in KVM. They plug a fairly serious bug which meant a guest could mess with the debug state and affect the host. With these patches applied the guest can still do normal debugging using software breakpoints but attempts to use the hardware registers are ignored. The only real changes I've made have been converting to the new C based world switch and the subsequent testing. The remaining patches in the series will take a bit more work and I guess depends on how many KVM guests actually need to use HW breakpoints and watchpoints. The code is a little more hairy on ARMv7 compared to ARMv8 due to complications accessing things like DBGDSCR. Cheers, Alex. Zhichao Huang (2): KVM: arm: plug guest debug exploit KVM: arm: rename pm_fake handler to trap_raz_wi arch/arm/include/asm/kvm_coproc.h | 3 +- arch/arm/kvm/coproc.c | 110 ++++++++++++++++++++++++++------------ arch/arm/kvm/handle_exit.c | 4 +- arch/arm/kvm/hyp/switch.c | 4 +- 4 files changed, 83 insertions(+), 38 deletions(-) -- 2.11.0
