Re: [PATCH 03/54] KVM: x86: Properly reset MMU context at vCPU RESET/INIT

[Paolo Bonzini]

On 22/06/21 19:56, Sean Christopherson wrote:
> +	/*
> +	 * Reset the MMU context if paging was enabled prior to INIT (which is
> +	 * implied if CR0.PG=1 as CR0 will be '0' prior to RESET).  Unlike the
> +	 * standard CR0/CR4/EFER modification paths, only CR0.PG needs to be
> +	 * checked because it is unconditionally cleared on INIT and all other
> +	 * paging related bits are ignored if paging is disabled, i.e. CR0.WP,
> +	 * CR4, and EFER changes are all irrelevant if CR0.PG was '0'.
> +	 */
> +	if (old_cr0 & X86_CR0_PG)
> +		kvm_mmu_reset_context(vcpu);

Hmm, I'll answer myself, is it because of the plan to add a vCPU reset 
ioctl?

Paolo