[PATCH v3 9/9] arm64: KVM: enable trapping of all debug registers
Marc Zyngier
marc.zyngier at arm.com
Fri Jun 20 06:00:07 PDT 2014
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 at linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
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 727087c..e36ca91 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 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
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