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([2404:f801:9000:1a:efea::4b1]) by smtp.gmail.com with ESMTPSA id h30sm4026153pfr.191.2021.07.29.08.02.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Jul 2021 08:02:33 -0700 (PDT) Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host visibility support To: Dave Hansen , 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 References: <20210728145232.285861-1-ltykernel@gmail.com> <20210728145232.285861-4-ltykernel@gmail.com> <0d956a05-7d24-57a0-f4a9-dccc849b52fc@gmail.com> From: Tianyu Lan Message-ID: <8df2845d-ee90-56d0-1228-adebb103ec37@gmail.com> Date: Thu, 29 Jul 2021 23:02:16 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Cc: linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, anparri@microsoft.com, vkuznets@redhat.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gNy8yOS8yMDIxIDEwOjA5IFBNLCBEYXZlIEhhbnNlbiB3cm90ZToKPiBPbiA3LzI5LzIxIDY6 MDEgQU0sIFRpYW55dSBMYW4gd3JvdGU6Cj4+IE9uIDcvMjkvMjAyMSAxOjA2IEFNLCBEYXZlIEhh bnNlbiB3cm90ZToKPj4+IE9uIDcvMjgvMjEgNzo1MiBBTSwgVGlhbnl1IExhbiB3cm90ZToKPj4+ PiBAQCAtMTk4Niw3ICsxOTg4LDkgQEAgc3RhdGljIGludCBfX3NldF9tZW1vcnlfZW5jX2RlYyh1 bnNpZ25lZCBsb25nCj4+Pj4gYWRkciwgaW50IG51bXBhZ2VzLCBib29sIGVuYykKPj4+PiAgwqDC oMKgwqDCoCBpbnQgcmV0Owo+Pj4+ICDCoCDCoMKgwqDCoMKgIC8qIE5vdGhpbmcgdG8gZG8gaWYg bWVtb3J5IGVuY3J5cHRpb24gaXMgbm90IGFjdGl2ZSAqLwo+Pj4+IC3CoMKgwqAgaWYgKCFtZW1f ZW5jcnlwdF9hY3RpdmUoKSkKPj4+PiArwqDCoMKgIGlmIChodl9pc19pc29sYXRpb25fc3VwcG9y dGVkKCkpCj4+Pj4gK8KgwqDCoMKgwqDCoMKgIHJldHVybiBodl9zZXRfbWVtX2VuYyhhZGRyLCBu dW1wYWdlcywgZW5jKTsKPj4+PiArwqDCoMKgIGVsc2UgaWYgKCFtZW1fZW5jcnlwdF9hY3RpdmUo KSkKPj4+PiAgwqDCoMKgwqDCoMKgwqDCoMKgIHJldHVybiAwOwo+Pj4KPj4+IE9uZSBtb3JlIHRo aW5nLsKgIElmIHlvdSdyZSBnb2luZyB0byBiZSBwYXRjaGluZyBnZW5lcmljIGNvZGUsIHBsZWFz ZQo+Pj4gc3RhcnQgdXNpbmcgZmVhdHVyZSBjaGVja3MgdGhhdCBjYW4gZ2V0IG9wdGltaXplZCBh d2F5IGF0IHJ1bnRpbWUuCj4+PiBodl9pc19pc29sYXRpb25fc3VwcG9ydGVkKCkgZG9lc24ndCBs b29rIGxpa2UgdGhlIHdvcmxkJ3MgY2hlYXBlc3QKPj4+IGNoZWNrLsKgIEl0IGNhbid0IGJlIGlu bGluZWQgYW5kIGNvc3RzIGF0IGxlYXN0IGEgZnVuY3Rpb24gY2FsbC4KPj4KPj4gWWVzLCB5b3Ug YXJlIHJpZ2h0LiBIb3cgYWJvdXQgYWRkaW5nIGEgc3RhdGljIGJyYW5jaCBrZXkgZm9yIHRoZSBj aGVjawo+PiBvZiBpc29sYXRpb24gVk0/IFRoaXMgbWF5IHJlZHVjZSB0aGUgY2hlY2sgY29zdC4K PiAKPiBJIGRvbid0IHRoaW5rIHlvdSBuZWVkIGEgc3RhdGljIGtleS4KPiAKPiBUaGVyZSBhcmUg YmFzaWNhbGx5IHRocmVlIGNob2ljZXM6Cj4gMS4gVXNlIGFuIGV4aXN0aW5nIFg4Nl9GRUFUVVJF IGJpdC4gIEkgdGhpbmsgdGhlcmUncyBhbHJlYWR5IG9uZSBmb3IKPiAgICAgd2hlbiB5b3UgYXJl IHJ1bm5pbmcgdW5kZXIgYSBoeXBlcnZpc29yLiAgSXQncyBub3Qgc3VwZXIgcHJlY2lzZSwKPiAg ICAgYnV0IGl0J3MgYmV0dGVyIHRoYW4gd2hhdCB5b3UgaGF2ZS4KPiAyLiBEZWZpbmUgYSBuZXcg WDg2X0ZFQVRVUkUgYml0IGZvciB3aGVuIHlvdSBhcmUgcnVubmluZyB1bmRlcgo+ICAgICBIeXBl ci1WLgo+IDMuIERlZmluZSBhIG5ldyBYODZfRkVBVFVSRSBiaXQgc3BlY2lmaWNhbGx5IGZvciBI eXBlci1WIGlzb2xhdGlvbiBWTQo+ICAgICBzdXBwb3J0LiAgVGhpcyBwYXJ0aWN1bGFyIGZlYXR1 cmUgbWlnaHQgYmUgYSBsaXR0bGUgdW5jb21tb24gdG8KPiAgICAgZGVzZXJ2ZSBpdHMgb3duIGJp dC4KPiAKPiBJJ2QgcHJvYmFibHkganVzdCBkbyAjMi4KPiAKClRoZXJlIGlzIHg4Nl9oeXBlcl90 eXBlIHRvIGlkZW50aWZ5IGh5cGVydmlzb3IgdHlwZSBhbmQgd2UgbWF5IGNoZWNrIAp0aGlzIHZh cmlhYmxlIGFmdGVyIGNoZWNraW5nIFg4Nl9GRUFUVVJFX0hZUEVSVklTT1IuCgpzdGF0aWMgaW5s aW5lIGJvb2wgaHZfaXNfaXNvbGF0aW9uX3N1cHBvcnRlZCh2b2lkKQp7CglpZiAoIWNwdV9mZWF0 dXJlX2VuYWJsZWQoWDg2X0ZFQVRVUkVfSFlQRVJWSVNPUikpCgkJcmV0dXJuIDA7CgogICAgICAg ICBpZiAoeDg2X2h5cGVyX3R5cGUgIT0gWDg2X0hZUEVSX01TX0hZUEVSVikKICAgICAgICAgICAg ICAgICByZXR1cm4gMDsKCgkvLyBvdXQgb2YgbGluZSBmdW5jdGlvbiBjYWxsOgoJcmV0dXJuIF9f aHZfaXNfaXNvbGF0aW9uX3N1cHBvcnRlZCgpOwp9CQpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwppb21tdSBtYWlsaW5nIGxpc3QKaW9tbXVAbGlzdHMubGlu dXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxt YW4vbGlzdGluZm8vaW9tbXU=