linux-kernel - Re: [PATCH v7 14/20] x86/virt/tdx: Set up reserved areas for all TDMRs

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Message-ID: <c752d17e-23fd-4452-e1d8-6c82748b6c8a@intel.com>
Date:   Mon, 28 Nov 2022 05:18:12 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Huang, Kai" <kai.huang@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "Luck, Tony" <tony.luck@...el.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "Gao, Chao" <chao.gao@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: [PATCH v7 14/20] x86/virt/tdx: Set up reserved areas for all
 TDMRs

On 11/28/22 01:14, Huang, Kai wrote:
> On Wed, 2022-11-23 at 15:39 -0800, Dave Hansen wrote:
...
>> /*
>>  * Go through tdx_memlist to find holes between memory areas.  If any of
>>  * those holes fall within @tdmr, set up a TDMR reserved area to cover
>>  * the hole.
>>  */
>> static int tdmr_populate_rsvd_holes(struct list_head *tdx_memlist,
>> 				    struct tdmr_info *tdmr,
>> 				    int *rsvd_idx)
> 
> Thanks!
> 
> Should I also change below function 'tdmr_set_up_pamt_rsvd_areas()' to, i.e.
> tdmr_populate_rsvd_pamts()?
> 
> Actually, there are two more functions in this patch: tdmr_set_up_rsvd_areas()
> and tdmrs_set_up_rsvd_areas_all().  Should I also change them to
> tdmr_populate_rsvd_areas() and tdmrs_populate_rsvd_areas_all()? 

I don't know.  I'll look at the naming again once I see it all together.

>> but I also get the feeling that 'prev_end' is a crummy variable name.  I
>> don't have any better suggestions at the moment.
>>
>>> +	list_for_each_entry(tmb, &tdx_memlist, list) {
>>> +		u64 start, end;
>>> +
>>> +		start = tmb->start_pfn << PAGE_SHIFT;
>>> +		end = tmb->end_pfn << PAGE_SHIFT;
>>> +
>>
>> More alignment opportunities:
>>
>> 		start = tmb->start_pfn << PAGE_SHIFT;
>> 		end   = tmb->end_pfn   << PAGE_SHIFT;
> 
> Should I use PFN_PHYS()?  Then looks we don't need this alignment.

Sure.