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arm64: KVM: enable trapping of all debug registers

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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@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2014-04-24 10:32:03 +01:00 committed by Christoffer Dall
parent b0e626b380
commit d329de0933
1 changed files with 8 additions and 0 deletions
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arch/arm64/kvm/hyp.S
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@ -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