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28 Jul 2021 10:06:51 -0700 X-IronPort-AV: E=Sophos;i="5.84,276,1620716400"; d="scan'208";a="517613242" Received: from sobsiex-desk2.amr.corp.intel.com (HELO [10.212.198.197]) ([10.212.198.197]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jul 2021 10:06:46 -0700 Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host visibility support To: 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, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.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 Cc: 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: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210728145232.285861-4-ltykernel@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/28/21 7:52 AM, Tianyu Lan wrote: > @@ -1986,7 +1988,9 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) > int ret; > > /* Nothing to do if memory encryption is not active */ > - if (!mem_encrypt_active()) > + if (hv_is_isolation_supported()) > + return hv_set_mem_enc(addr, numpages, enc); > + else if (!mem_encrypt_active()) > return 0; One more thing. If you're going to be patching generic code, please start using feature checks that can get optimized away at runtime. hv_is_isolation_supported() doesn't look like the world's cheapest check. It can't be inlined and costs at least a function call. These checks could, with basically no effort be wrapped in a header like this: static inline bool hv_is_isolation_supported(void) { if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) return 0; // out of line function call: return __hv_is_isolation_supported(); } I don't think it would be the end of the world to add an X86_FEATURE_HYPERV_GUEST, either. There are plenty of bits allocated for Xen and VMWare.