linux-kernel - Re: [PATCH RFC v9 04/51] KVM: x86: Determine shared/private faults using a configurable mask

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Date:   Mon, 19 Jun 2023 18:27:03 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Michael Roth <michael.roth@....com>
Cc:     kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
        linux-mm@...ck.org, linux-crypto@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
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        ardb@...nel.org, pbonzini@...hat.com, seanjc@...gle.com,
        vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org,
        dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com,
        peterz@...radead.org, srinivas.pandruvada@...ux.intel.com,
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        nikunj.dadhania@....com, liam.merwick@...cle.com,
        zhi.a.wang@...el.com
Subject: Re: [PATCH RFC v9 04/51] KVM: x86: Determine shared/private faults
 using a configurable mask

On Sun, Jun 11, 2023 at 11:25:12PM -0500, Michael Roth wrote:
> This will be used to determine whether or not an #NPF should be serviced
> using a normal page vs. a guarded/gmem one.
> 
> Signed-off-by: Michael Roth <michael.roth@....com>
> ---
>  arch/x86/include/asm/kvm_host.h |  7 +++++++
>  arch/x86/kvm/mmu/mmu_internal.h | 35 ++++++++++++++++++++++++++++++++-
>  2 files changed, 41 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index b3bd24f2a390..c26f76641121 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1445,6 +1445,13 @@ struct kvm_arch {
>  	 */
>  #define SPLIT_DESC_CACHE_MIN_NR_OBJECTS (SPTE_ENT_PER_PAGE + 1)
>  	struct kvm_mmu_memory_cache split_desc_cache;
> +
> +	/*
> +	 * When set, used to determine whether a fault should be treated as
	   ^^^^^^^^

And when not set? Invalid?

I guess so, judging by the code below.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette