linux-kernel - Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host visibility support

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Message-ID: <5badc0cb-3038-2eff-a4bf-022ce8fc51d7@suse.com>
Date:   Mon, 2 Aug 2021 15:11:40 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Joerg Roedel <joro@...tes.org>, Dave Hansen <dave.hansen@...el.com>
Cc:     Tianyu Lan <ltykernel@...il.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
        sstabellini@...nel.org, will@...nel.org, davem@...emloft.net,
        kuba@...nel.org, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        arnd@...db.de, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, thomas.lendacky@....com,
        brijesh.singh@....com, ardb@...nel.org, Tianyu.Lan@...rosoft.com,
        rientjes@...gle.com, martin.b.radev@...il.com,
        akpm@...ux-foundation.org, rppt@...nel.org,
        kirill.shutemov@...ux.intel.com, aneesh.kumar@...ux.ibm.com,
        krish.sadhukhan@...cle.com, saravanand@...com,
        xen-devel@...ts.xenproject.org, pgonda@...gle.com,
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        sfr@...b.auug.org.au, michael.h.kelley@...rosoft.com,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
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        linux-scsi@...r.kernel.org, netdev@...r.kernel.org,
        vkuznets@...hat.com, anparri@...rosoft.com
Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host
 visibility support

On 02.08.21 14:01, Joerg Roedel wrote:
> On Wed, Jul 28, 2021 at 08:29:41AM -0700, Dave Hansen wrote:
>> __set_memory_enc_dec() is turning into a real mess.  SEV, TDX and now
>> Hyper-V are messing around in here.
> 
> I was going to suggest a PV_OPS call where the fitting implementation
> for the guest environment can be plugged in at boot. There is TDX and an
> SEV(-SNP) case, a Hyper-V case, and likely more coming up from other
> cloud/hypervisor vendors. Hiding all these behind feature checks is not
> going to make things cleaner.

As those cases are all mutually exclusive, wouldn't a static_call() be
the appropriate solution?


Juergen

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