linux-kernel - Re: [PATCH v2 5/8] KVM: SEV: Prefer WBNOINVD over WBINVD for cache maintenance efficiency

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Message-ID: <4fde4c953a4204e70d89f2c3dfd24eccdac0540f.camel@gmail.com>
Date: Sun, 18 May 2025 11:52:07 +0200
From: Francesco Lavra <francescolavra.fl@...il.com>
To: seanjc@...gle.com
Cc: airlied@...il.com, bp@...en8.de, dave.hansen@...ux.intel.com, 
 dri-devel@...ts.freedesktop.org, kai.huang@...el.com,
 kevinloughlin@...gle.com,  kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org,  maarten.lankhorst@...ux.intel.com,
 mingo@...hat.com, mizhang@...gle.com,  mripard@...nel.org,
 pbonzini@...hat.com, simona@...ll.ch, szy0127@...u.edu.cn, 
 tglx@...utronix.de, thomas.lendacky@....com, tzimmermann@...e.de,
 x86@...nel.org
Subject: Re: [PATCH v2 5/8] KVM: SEV: Prefer WBNOINVD over WBINVD for cache
 maintenance efficiency

On 2025-05-16 at 21:28, Sean Christopherson wrote:
> @@ -3901,7 +3908,7 @@ void sev_snp_init_protected_guest_state(struct
> kvm_vcpu *vcpu)
>  	 * From this point forward, the VMSA will always be a guest-
> mapped page
>  	 * rather than the initial one allocated by KVM in svm-
> >sev_es.vmsa. In
>  	 * theory, svm->sev_es.vmsa could be free'd and cleaned up here,
> but
> -	 * that involves cleanups like wbinvd_on_all_cpus() which would
> ideally
> +	 * that involves cleanups like flushing caches, which would
> ideally be
>  	 * be handled during teardown rather than guest boot.  Deferring
> that

Duplicate "be"