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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id i11sm701592ion.1.2020.01.23.13.27.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Jan 2020 13:27:16 -0800 (PST) Subject: Re: [PATCH] iommu: amd: Fix IOMMU perf counter clobbering during init To: Suravee Suthikulpanit , Joerg Roedel References: <20200114151220.29578-1-skhan@linuxfoundation.org> <20200117100829.GE15760@8bytes.org> <42c0a806-9947-1401-9754-8aa88bd7062f@amd.com> <24a46b0f-33d7-5f94-661a-80f035213892@linuxfoundation.org> From: Shuah Khan Message-ID: Date: Thu, 23 Jan 2020 14:27:15 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <24a46b0f-33d7-5f94-661a-80f035213892@linuxfoundation.org> Content-Language: en-US Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Shuah Khan 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" T24gMS8yMS8yMCA4OjMyIEFNLCBTaHVhaCBLaGFuIHdyb3RlOgo+IE9uIDEvMjAvMjAgNzoxMCBQ TSwgU3VyYXZlZSBTdXRoaWt1bHBhbml0IHdyb3RlOgo+PiBPbiAxLzE3LzIwMjAgNTowOCBQTSwg Sm9lcmcgUm9lZGVsIHdyb3RlOgo+Pj4gQWRkaW5nIFN1cmF2ZWUsIHdobyB3cm90ZSB0aGUgSU9N TVUgUGVyZiBDb3VudGVyIGNvZGUuCj4+Pgo+Pj4gT24gVHVlLCBKYW4gMTQsIDIwMjAgYXQgMDg6 MTI6MjBBTSAtMDcwMCwgU2h1YWggS2hhbiB3cm90ZToKPj4+PiBpbml0X2lvbW11X3BlcmZfY3Ry KCkgY2xvYmJlcnMgdGhlIHJlZ2lzdGVyIHdoZW4gaXQgY2hlY2tzIHdyaXRlIGFjY2Vzcwo+Pj4+ IHRvIElPTU1VIHBlcmYgY291bnRlcnMgYW5kIGZhaWxzIHRvIHJlc3RvcmUgd2hlbiB0aGV5IGFy ZSB3cml0YWJsZS4KPj4+Pgo+Pj4+IEFkZCBzYXZlIGFuZCByZXN0b3JlIHRvIGZpeCBpdC4KPj4+ Pgo+Pj4+IFNpZ25lZC1vZmYtYnk6IFNodWFoIEtoYW48c2toYW5AbGludXhmb3VuZGF0aW9uLm9y Zz4KPj4+PiAtLS0KPj4+PiDCoCBkcml2ZXJzL2lvbW11L2FtZF9pb21tdV9pbml0LmMgfCAyMiAr KysrKysrKysrKysrKysrLS0tLS0tCj4+Pj4gwqAgMSBmaWxlIGNoYW5nZWQsIDE2IGluc2VydGlv bnMoKyksIDYgZGVsZXRpb25zKC0pCj4+PiBTdXJhdmVlLCBjYW4geW91IHBsZWFzZSByZXZpZXcg dGhpcyBwYXRjaD8KPj4+Cj4+Cj4+IFRoaXMgbG9va3Mgb2suIERvZXMgdGhpcyBmaXggY2VydGFp biBpc3N1ZXM/IE9yIGlzIHRoaXMganVzdCBmb3Igc2FuaXR5Lgo+IAo+IEkgZGlkbid0IG5vdGlj ZSBhbnkgcHJvYmxlbXMuIENvdW50ZXJzIGFyZW4ndCB3cml0YWJsZSBvbiBteSBzeXN0ZW0uCj4g SG93ZXZlciwgaXQgY2VydGFpbmx5IGxvb2tzIGxpa2UgYSBib2cgc2luY2UgcmVnaXN0ZXJzIGFy ZW4ndCByZXN0b3JlZAo+IGxpa2UgaW4gb3RoZXIgcGxhY2VzIGluIHRoaXMgZmlsZSB3aGVyZSBz dWNoIGNoZWNrcyBhcmUgZG9uZSBvbiBvdGhlcgo+IHJlZ2lzdGVycy4KPiAKPiBJIHNlZSAyIGJh bmtzIGFuZCA0IGNvdW50ZXJzIG9uIG15IHN5c3RlbS4gSXMgaXQgc3VmZmljaWVudCB0byBjaGVj awo+IHRoZSBmaXJzdCBiYW5rIGFuZCBmaXJzdCBjb3VudGVyPyBJbiBvdGhlciB3b3JkcywgaWYg dGhlIGZpcnN0IG9uZQo+IGlzbid0IHdyaXRhYmxlLCBhcmUgYWxsIGNvdW50ZXJzIG5vbi13cml0 YWJsZT8KPiAKPiBTaG91bGQgd2UgcmVhZCB0aGUgY29uZmlnIGZpcnN0IGFuZCB0aGVuLCB0cnkg dG8gc2VlIGlmIGFueSBvZiB0aGUKPiBjb3VudGVycyBhcmUgd3JpdGFibGU/IEkgaGF2ZSBhIHBh dGNoIHRoYXQgZG9lcyB0aGF0LCBJIGNhbiBzZW5kIGl0Cj4gb3V0IGZvciByZXZpZXcuCj4gCj4+ Cj4+IFJldmlld2VkLWJ5OiBTdXJhdmVlIFN1dGhpa3VscGFuaXQgPHN1cmF2ZWUuc3V0aGlrdWxw YW5pdEBhbWQuY29tPgoKSm9lcmcsCgpQbGVhc2UgZG9uJ3QgcHVsbCB0aGlzIGluLiBJIGludHJv ZHVjZWQgYSBidWcgaW4gdGhpcyBwYXRjaC4gSXQgYWx3YXlzCnJldHVybnMgYW1kX2lvbW11X3Bj X3ByZXNlbnQgZmFsc2UgZXZlbiB3aGVuIGl0IGNhbiB3cml0ZSB0byB0aGUKY291bnRlcnMuIE15 IGJhZC4KCkkgd2lsbCBzZW5kIHYyLgoKdGhhbmtzLAotLSBTaHVhaApfX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwppb21tdSBtYWlsaW5nIGxpc3QKaW9tbXVA bGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24u b3JnL21haWxtYW4vbGlzdGluZm8vaW9tbXU=