Enable trapping of the debug registers, preventing the guests to mess with the host state (and allowing guests to use the debug infrastructure as well). Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> --- arch/arm64/kvm/hyp.S | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index f9d5a1d..037d5d9 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -753,6 +753,14 @@ __kvm_hyp_code_start: mrs x2, mdcr_el2 and x2, x2, #MDCR_EL2_HPMN_MASK orr x2, x2, #(MDCR_EL2_TPM | MDCR_EL2_TPMCR) + orr x2, x2, #(MDCR_EL2_TDRA | MDCR_EL2_TDOSA) + + // Check for KVM_ARM64_DEBUG_DIRTY, and set to debug to trap + // if not dirty. + ldr x3, [x0, #VCPU_DEBUG_FLAGS] + tbnz x3, #KVM_ARM64_DEBUG_DIRTY_SHIFT, 1f + orr x2, x2, #MDCR_EL2_TDA +1: msr mdcr_el2, x2 .endm -- 1.8.3.4 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
