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). Reviewed-by: Anup Patel <anup.patel@xxxxxxxxxx> 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 73ec5c4..72ed0bf8 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -777,6 +777,14 @@ __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 -- 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
