Re: [PATCH v7 5/10] KVM: arm/arm64: preserve host MDCR_EL2 value

On 19/03/2019 08:30, Amit Daniel Kachhap wrote:

Save host MDCR_EL2 value during kvm HYP initialisation and restore
after every switch from host to guest. There should not be any
change in functionality due to this.

The value of mdcr_el2 is now stored in struct kvm_cpu_context as
both host and guest can now use this field in a common way.

Signed-off-by: Amit Daniel Kachhap <redacted>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <redacted>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Christoffer Dall <redacted>
Cc: kvmarm@lists.cs.columbia.edu

[...]

 /**
- * kvm_arm_init_debug - grab what we need for debug
- *
- * Currently the sole task of this function is to retrieve the initial
- * value of mdcr_el2 so we can preserve MDCR_EL2.HPMN which has
- * presumably been set-up by some knowledgeable bootcode.
- *
- * It is called once per-cpu during CPU hyp initialisation.
- */
-
-void kvm_arm_init_debug(void)
-{
-	__this_cpu_write(mdcr_el2, kvm_call_hyp_ret(__kvm_get_mdcr_el2));
-}

The __kvm_get_mdcr_el2 function is no longer used anywhere, so can also
be removed.

Thanks,
Kristina

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