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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id r14sm13344854ilg.59.2020.01.21.07.32.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Jan 2020 07:32:15 -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> From: Shuah Khan Message-ID: <24a46b0f-33d7-5f94-661a-80f035213892@linuxfoundation.org> Date: Tue, 21 Jan 2020 08:32:14 -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: <42c0a806-9947-1401-9754-8aa88bd7062f@amd.com> 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" T24gMS8yMC8yMCA3OjEwIFBNLCBTdXJhdmVlIFN1dGhpa3VscGFuaXQgd3JvdGU6Cj4gT24gMS8x Ny8yMDIwIDU6MDggUE0sIEpvZXJnIFJvZWRlbCB3cm90ZToKPj4gQWRkaW5nIFN1cmF2ZWUsIHdo byB3cm90ZSB0aGUgSU9NTVUgUGVyZiBDb3VudGVyIGNvZGUuCj4+Cj4+IE9uIFR1ZSwgSmFuIDE0 LCAyMDIwIGF0IDA4OjEyOjIwQU0gLTA3MDAsIFNodWFoIEtoYW4gd3JvdGU6Cj4+PiBpbml0X2lv bW11X3BlcmZfY3RyKCkgY2xvYmJlcnMgdGhlIHJlZ2lzdGVyIHdoZW4gaXQgY2hlY2tzIHdyaXRl IGFjY2Vzcwo+Pj4gdG8gSU9NTVUgcGVyZiBjb3VudGVycyBhbmQgZmFpbHMgdG8gcmVzdG9yZSB3 aGVuIHRoZXkgYXJlIHdyaXRhYmxlLgo+Pj4KPj4+IEFkZCBzYXZlIGFuZCByZXN0b3JlIHRvIGZp eCBpdC4KPj4+Cj4+PiBTaWduZWQtb2ZmLWJ5OiBTaHVhaCBLaGFuPHNraGFuQGxpbnV4Zm91bmRh dGlvbi5vcmc+Cj4+PiAtLS0KPj4+IMKgIGRyaXZlcnMvaW9tbXUvYW1kX2lvbW11X2luaXQuYyB8 IDIyICsrKysrKysrKysrKysrKystLS0tLS0KPj4+IMKgIDEgZmlsZSBjaGFuZ2VkLCAxNiBpbnNl cnRpb25zKCspLCA2IGRlbGV0aW9ucygtKQo+PiBTdXJhdmVlLCBjYW4geW91IHBsZWFzZSByZXZp ZXcgdGhpcyBwYXRjaD8KPj4KPiAKPiBUaGlzIGxvb2tzIG9rLiBEb2VzIHRoaXMgZml4IGNlcnRh aW4gaXNzdWVzPyBPciBpcyB0aGlzIGp1c3QgZm9yIHNhbml0eS4KCkkgZGlkbid0IG5vdGljZSBh bnkgcHJvYmxlbXMuIENvdW50ZXJzIGFyZW4ndCB3cml0YWJsZSBvbiBteSBzeXN0ZW0uCkhvd2V2 ZXIsIGl0IGNlcnRhaW5seSBsb29rcyBsaWtlIGEgYm9nIHNpbmNlIHJlZ2lzdGVycyBhcmVuJ3Qg cmVzdG9yZWQKbGlrZSBpbiBvdGhlciBwbGFjZXMgaW4gdGhpcyBmaWxlIHdoZXJlIHN1Y2ggY2hl Y2tzIGFyZSBkb25lIG9uIG90aGVyCnJlZ2lzdGVycy4KCkkgc2VlIDIgYmFua3MgYW5kIDQgY291 bnRlcnMgb24gbXkgc3lzdGVtLiBJcyBpdCBzdWZmaWNpZW50IHRvIGNoZWNrCnRoZSBmaXJzdCBi YW5rIGFuZCBmaXJzdCBjb3VudGVyPyBJbiBvdGhlciB3b3JkcywgaWYgdGhlIGZpcnN0IG9uZQpp c24ndCB3cml0YWJsZSwgYXJlIGFsbCBjb3VudGVycyBub24td3JpdGFibGU/CgpTaG91bGQgd2Ug cmVhZCB0aGUgY29uZmlnIGZpcnN0IGFuZCB0aGVuLCB0cnkgdG8gc2VlIGlmIGFueSBvZiB0aGUK Y291bnRlcnMgYXJlIHdyaXRhYmxlPyBJIGhhdmUgYSBwYXRjaCB0aGF0IGRvZXMgdGhhdCwgSSBj YW4gc2VuZCBpdApvdXQgZm9yIHJldmlldy4KCj4gCj4gUmV2aWV3ZWQtYnk6IFN1cmF2ZWUgU3V0 aGlrdWxwYW5pdCA8c3VyYXZlZS5zdXRoaWt1bHBhbml0QGFtZC5jb20+ClRoYW5rcyBmb3IgdGhl IHJldmlldy4KCnRoYW5rcywKLS0gU2h1YWgKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KaW9tbXUgbWFpbGluZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZv dW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xp c3RpbmZvL2lvbW11