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Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host
 visibility support
To:     Joerg Roedel <joro@8bytes.org>, Dave Hansen <dave.hansen@intel.com>
Cc:     Tianyu Lan <ltykernel@gmail.com>, kys@microsoft.com,
        haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org,
        decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com,
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        dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org,
        konrad.wilk@oracle.com, boris.ostrovsky@oracle.com,
        sstabellini@kernel.org, will@kernel.org, davem@davemloft.net,
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        arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com,
        robin.murphy@arm.com, thomas.lendacky@amd.com,
        brijesh.singh@amd.com, ardb@kernel.org, Tianyu.Lan@microsoft.com,
        rientjes@google.com, martin.b.radev@gmail.com,
        akpm@linux-foundation.org, rppt@kernel.org,
        kirill.shutemov@linux.intel.com, aneesh.kumar@linux.ibm.com,
        krish.sadhukhan@oracle.com, saravanand@fb.com,
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        iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
        linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-scsi@vger.kernel.org, netdev@vger.kernel.org,
        vkuznets@redhat.com, anparri@microsoft.com
References: <20210728145232.285861-1-ltykernel@gmail.com>
 <20210728145232.285861-4-ltykernel@gmail.com>
 <c00e269c-da4c-c703-0182-0221c73a76cc@intel.com>
 <YQfepYTC4n6agq9z@8bytes.org>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <5badc0cb-3038-2eff-a4bf-022ce8fc51d7@suse.com>
Date:   Mon, 2 Aug 2021 15:11:40 +0200
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From: Juergen Gross <jgross@suse.com>
To: Joerg Roedel <joro@8bytes.org>, Dave Hansen <dave.hansen@intel.com>
Cc: Tianyu Lan <ltykernel@gmail.com>, kys@microsoft.com,
 haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org,
 decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
 x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org,
 peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com,
 sstabellini@kernel.org, will@kernel.org, davem@davemloft.net,
 kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com,
 arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com,
 thomas.lendacky@amd.com, brijesh.singh@amd.com, ardb@kernel.org,
 Tianyu.Lan@microsoft.com, rientjes@google.com, martin.b.radev@gmail.com,
 akpm@linux-foundation.org, rppt@kernel.org, kirill.shutemov@linux.intel.com,
 aneesh.kumar@linux.ibm.com, krish.sadhukhan@oracle.com, saravanand@fb.com,
 xen-devel@lists.xenproject.org, pgonda@google.com, david@redhat.com,
 keescook@chromium.org, hannes@cmpxchg.org, sfr@canb.auug.org.au,
 michael.h.kelley@microsoft.com, iommu@lists.linux-foundation.org,
 linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
 netdev@vger.kernel.org, vkuznets@redhat.com, anparri@microsoft.com
Message-ID: <5badc0cb-3038-2eff-a4bf-022ce8fc51d7@suse.com>
Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host
 visibility support
References: <20210728145232.285861-1-ltykernel@gmail.com>
 <20210728145232.285861-4-ltykernel@gmail.com>
 <c00e269c-da4c-c703-0182-0221c73a76cc@intel.com>
 <YQfepYTC4n6agq9z@8bytes.org>
In-Reply-To: <YQfepYTC4n6agq9z@8bytes.org>

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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.
>=20
> 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 a=
n
> 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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