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Mon, 02 Aug 2021 13:11:41 +0000 Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host visibility support To: Joerg Roedel , Dave Hansen Cc: Tianyu Lan , 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 References: <20210728145232.285861-1-ltykernel@gmail.com> <20210728145232.285861-4-ltykernel@gmail.com> From: Juergen Gross Message-ID: <5badc0cb-3038-2eff-a4bf-022ce8fc51d7@suse.com> Date: Mon, 2 Aug 2021 15:11:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="6QoUicHSwDgMfYyEE95G98YrCRDodiK4T" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --6QoUicHSwDgMfYyEE95G98YrCRDodiK4T Content-Type: multipart/mixed; boundary="Q8kndzyNPSJWNnMRXKERSCRNX9KvLdc3e"; protected-headers="v1" From: Juergen Gross To: Joerg Roedel , Dave Hansen Cc: Tianyu Lan , 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> In-Reply-To: --Q8kndzyNPSJWNnMRXKERSCRNX9KvLdc3e Content-Type: multipart/mixed; boundary="------------39BD9DF23E5C4BB3D3E4101D" Content-Language: en-US This is a multi-part message in MIME format. --------------39BD9DF23E5C4BB3D3E4101D Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable 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? 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