linux-kernel - Re: [PATCH v4 04/16] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT

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Message-ID: <cf8074a66b1fb7059035f2b1820163bda6e63443.camel@intel.com>
Date: Wed, 26 Nov 2025 17:56:39 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-coco@...ts.linux.dev"
	<linux-coco@...ts.linux.dev>, "Huang, Kai" <kai.huang@...el.com>, "Li,
 Xiaoyao" <xiaoyao.li@...el.com>, "Hansen, Dave" <dave.hansen@...el.com>,
	"Zhao, Yan Y" <yan.y.zhao@...el.com>, "Wu, Binbin" <binbin.wu@...el.com>,
	"kas@...nel.org" <kas@...nel.org>, "seanjc@...gle.com" <seanjc@...gle.com>,
	"mingo@...hat.com" <mingo@...hat.com>, "linux-kernel@...r.kernel.org"
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	"Yamahata, Isaku" <isaku.yamahata@...el.com>, "tglx@...utronix.de"
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 Chao" <chao.gao@...el.com>, "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org"
	<x86@...nel.org>
Subject: Re: [PATCH v4 04/16] x86/virt/tdx: Allocate page bitmap for Dynamic
 PAMT

On Tue, 2025-11-25 at 09:50 +0800, Binbin Wu wrote:
> Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>

Thanks.

> 
> One nit below.


> 
> [...]
> > diff --git a/arch/x86/virt/vmx/tdx/tdx_global_metadata.c b/arch/x86/virt/vmx/tdx/tdx_global_metadata.c
> > index 13ad2663488b..00ab0e550636 100644
> > --- a/arch/x86/virt/vmx/tdx/tdx_global_metadata.c
> > +++ b/arch/x86/virt/vmx/tdx/tdx_global_metadata.c
> > @@ -33,6 +33,13 @@ static int get_tdx_sys_info_tdmr(struct tdx_sys_info_tdmr *sysinfo_tdmr)
> >    		sysinfo_tdmr->pamt_2m_entry_size = val;
> >    	if (!ret && !(ret = read_sys_metadata_field(0x9100000100000012, &val)))
> >    		sysinfo_tdmr->pamt_1g_entry_size = val;
> > +	/*
> > +	 * Don't fail here if tdx_supports_dynamic_pamt() isn't supported. The
> 
> A bit weird to say "if tdx_supports_dynamic_pamt() isn't supported", how about
> using "if dynamic PAMT isn't supported"?

Yes, good point, I'll use your suggestion.