[PATCH 11/13] arm64: KVM/debug: trap all accesses to SPE controls at EL1
From: Sudeep Holla <hidden>
Date: 2019-02-28 16:12:46
Also in:
kvmarm
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
Now that we have all the save/restore mechanism in place, lets enable trapping of accesses to SPE profiling buffer controls at EL1 to EL2. This will also change the translation regime used by buffer from EL2 stage 1 to EL1 stage 1 on VHE systems. Signed-off-by: Sudeep Holla <redacted> --- arch/arm64/kvm/hyp/switch.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 3054b8b8f037..8738e9438780 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c@@ -106,6 +106,7 @@ static void activate_traps_vhe(struct kvm_vcpu *vcpu) write_sysreg(val, cpacr_el1); + write_sysreg(vcpu->arch.mdcr_el2 | 2 << MDCR_EL2_E2PB_SHIFT, mdcr_el2); write_sysreg(kvm_get_hyp_vector(), vbar_el1); } NOKPROBE_SYMBOL(activate_traps_vhe);
@@ -123,6 +124,7 @@ static void __hyp_text __activate_traps_nvhe(struct kvm_vcpu *vcpu) __activate_traps_fpsimd32(vcpu); } + write_sysreg(vcpu->arch.mdcr_el2 | 2 << MDCR_EL2_E2PB_SHIFT, mdcr_el2); write_sysreg(val, cptr_el2); }
--
2.17.1
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