Re: [PATCH 47/54] KVM: x86/mmu: Add helpers to do full reserved SPTE checks w/ generic MMU

[Paolo Bonzini]

On 22/06/21 19:57, Sean Christopherson wrote:
> +	/*
> +	 * Use a bitwise-OR instead of a logical-OR to aggregate the reserved
> +	 * bits and EPT's invalid memtype/XWR checks to avoid an extra Jcc
> +	 * (this is used in hot paths).

Probably s/this is used in hot paths/this is extremely unlikely to be 
short-circuited as true/, since we are at it.

Paolo

> +	 */
> +	return __is_bad_mt_xwr(rsvd_check, spte) |
> +	       __is_rsvd_bits_set(rsvd_check, spte, level);