[PATCH v4 9/9] arm64: KVM: enable trapping of all debug registers
From: Marc Zyngier <hidden>
Date: 2014-07-09 17:13:01
Also in:
kvm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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 <redacted> Reviewed-by: Christoffer Dall <redacted> Signed-off-by: Marc Zyngier <redacted> --- 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 100494b..b72aa9f 100644
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S@@ -770,6 +770,14 @@ 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
--
2.0.0