linux-kernel - Re: [PATCHv2 07/12] KVM: TDX: Preallocate PAMT pages to be used in page fault path

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Message-ID: <f58bca0331f3ba0bcd55d68f86c2563e6aa70747.camel@intel.com>
Date: Thu, 10 Jul 2025 01:34:19 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>
CC: "Gao, Chao" <chao.gao@...el.com>, "bp@...en8.de" <bp@...en8.de>, "Huang,
 Kai" <kai.huang@...el.com>, "x86@...nel.org" <x86@...nel.org>,
	"mingo@...hat.com" <mingo@...hat.com>, "Zhao, Yan Y" <yan.y.zhao@...el.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>, "linux-coco@...ts.linux.dev"
	<linux-coco@...ts.linux.dev>, "Yamahata, Isaku" <isaku.yamahata@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 07/12] KVM: TDX: Preallocate PAMT pages to be used in
 page fault path

On Mon, 2025-06-09 at 22:13 +0300, Kirill A. Shutemov wrote:
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index cbc84c6abc2e..d99bb27b5b01 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -616,6 +616,12 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu, bool maybe_indirect)
>  		if (r)
>  			return r;
>  	}
> +
> +	r = kvm_mmu_topup_memory_cache(&vcpu->arch.pamt_page_cache,
> +				       tdx_nr_pamt_pages() * PT64_ROOT_MAX_LEVEL);
> +	if (r)
> +		return r;
> +

Shouldn't this be only for TD vCPUs?