From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Lutomirski Subject: Re: [PATCH v4 2/5] x86/msr: Carry on after a non-"safe" MSR access fails without !panic_on_oops Date: Mon, 14 Mar 2016 11:24:00 -0700 Message-ID: References: <20160314120202.GD15800@pd.tnic> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Linus Torvalds Cc: KVM list , Peter Zijlstra , X86 ML , "linux-kernel@vger.kernel.org" , xen-devel , Borislav Petkov , Andy Lutomirski , Paolo Bonzini , Andrew Morton , Arjan van de Ven List-Id: xen-devel@lists.xenproject.org T24gTW9uLCBNYXIgMTQsIDIwMTYgYXQgMTE6MTUgQU0sIExpbnVzIFRvcnZhbGRzCjx0b3J2YWxk c0BsaW51eC1mb3VuZGF0aW9uLm9yZz4gd3JvdGU6Cj4gT24gTW9uLCBNYXIgMTQsIDIwMTYgYXQg MTE6MTAgQU0sIEFuZHkgTHV0b21pcnNraSA8bHV0b0BhbWFjYXBpdGFsLm5ldD4gd3JvdGU6Cj4+ Cj4+IEEgY291cGxlIG9mIHRoZSB3cm1zciB1c2VycyBhY3R1YWxseSBjYXJlIGFib3V0IHBlcmZv cm1hbmNlLiAgVGhlc2UKPj4gYXJlIHRoZSBvbmVzIGludm9sdmVkIGluIGNvbnRleHQgc3dpdGNo aW5nIGFuZCwgdG8gYSBsZXNzZXIgZXh0ZW50LCBpbgo+PiBzd2l0Y2hpbmcgaW4gYW5kIG91dCBv ZiBndWVzdCBtb2RlLgo+Cj4gLi4gb2ssIHNlZSB0aGUgY3Jvc3NlZCBlbWFpbHMuCj4KPiBJJ2Qg Km11Y2gqIHJhdGhlciBzcGVjaWFsIGNhc2UgdGhlIHNwZWNpYWwgY2FzZXMuIE5vdCBtYWtlIHRo ZSBnZW5lcmljCj4gY2FzZSBzb21ldGhpbmcgY29tcGxleC4KClRoZSBjb2RlIGluIG15IHF1ZXVl IGlzLCBsaXRlcmFsbHk6Cgpib29sIGV4X2hhbmRsZXJfcmRtc3JfdW5zYWZlKGNvbnN0IHN0cnVj dCBleGNlcHRpb25fdGFibGVfZW50cnkgKmZpeHVwLAogICAgICAgICAgICAgICAgIHN0cnVjdCBw dF9yZWdzICpyZWdzLCBpbnQgdHJhcG5yKQp7CiAgICBXQVJOX09OQ0UoMSwgInVuY2hlY2tlZCBN U1IgYWNjZXNzIGVycm9yOiBSRE1TUiBmcm9tIDB4JXgiLAogICAgICAgICAgKHVuc2lnbmVkIGlu dClyZWdzLT5jeCk7CgogICAgLyogUHJldGVuZCB0aGF0IHRoZSByZWFkIHN1Y2NlZWRlZCBhbmQg cmV0dXJuZWQgMC4gKi8KICAgIHJlZ3MtPmlwID0gZXhfZml4dXBfYWRkcihmaXh1cCk7CiAgICBy ZWdzLT5heCA9IDA7CiAgICByZWdzLT5keCA9IDA7CiAgICByZXR1cm4gdHJ1ZTsKfQpFWFBPUlRf U1lNQk9MKGV4X2hhbmRsZXJfcmRtc3JfdW5zYWZlKTsKClRoZSBvbmx5IHJlZ2FyZCBpbiB3aGlj aCB0aGlzIGlzIGFueSBtb3JlIGNvbXBsZXggdGhhbiB0aGUgX3NhZmUKdmFyaWFudCBpcyBiZWNh dXNlIHRoZXJlJ3MgYSB3YXJuaW5nIChvbmUgbGluZSBvZiBjb2RlKSBhbmQgYmVjYXVzZQp0aGUg X3NhZmUgdmFyaWFudCBmb3Jnb3QgdG8gemVybyB0aGUgcmVzdWx0ICh0d28gbGluZXMgb2YgY29k ZSkuICBNeQpzZXJpZXMgZml4ZXMgdGhlIGxhdHRlciwgc28gd2UncmUgdGFsa2luZyBhYm91dCBh bG1vc3Qgbm8gc291cmNlIGNvZGUKc2l6ZSBkaWZmZXJlbmNlLiAgVGhlcmUgKmlzKiBhIGRpZmZl cmVuY2UgaW4gYmluYXJ5IHNpemUsIHRob3VnaCAtLQp0aGUgX3NhZmUgdmFyaWFudCBlbWl0cyBh IGNvcHkgb2YgaXRzIGZpeHVwIGV2ZXJ5IHRpbWUgaXQgYXBwZWFycywKd2hlcmVhcyB0aGUgbmV3 IGZpeHVwIGFwcGVhcnMgb25jZS4KClNvIEkgdGhpbmsgd2Ugc2hvdWxkIGFwcGx5IG15IHBhdGNo ZXMgKHdpdGggdGhlIGVhcmx5IGhhbmRsaW5nIGZpeGVkCmFuZCB0aGUgcGFuaWNfb25fb29wcyBy ZW1vdmVkKSwgYW5kIHRoZW4gY29uc2lkZXIgcmVpbXBsZW1lbnRpbmcgdGhlCl9zYWZlIHZhcmlh bnQgdXNpbmcgZmFuY3kgaGFuZGxlcnMgdG8gcmVkdWNlIG51bWJlciBvZiBsaW5lcyBvZiBhc20K YW5kIGNvZGUgc2l6ZSwgYW5kIHRoZW4gY29uc2lkZXIgY2hhbmdpbmcgdGhlIG92ZXJhbGwgQVBJ IG9uIHRvcCBpZiB3ZQp0aGluayB0aGVyZSdzIGEgYmV0dGVyIEFQSSB0byBiZSBoYWQuCgpJcyB0 aGF0IG9rYXk/Cgo+Cj4gQW5kICpwYXJ0aWN1bGFybHkqIG5vdCBtYWtlIHRoZSBnZW5lcmljIGNh c2UgYmUgc29tZXRoaW5nIHdoZXJlIHBlb3BsZQo+IHRoaW5rIGl0J3Mgc2FuZSB0byBvb3BzIGFu ZCBraWxsIHRoZSBtYWNoaW5lLiBDaHJpc3QuCgpJJ3ZlIGFscmVhZHkgcmVtb3ZlZCB0aGUgcGFu aWNfb25fb29wcyB0aGluZyBmcm9tIG15IHRyZWUuCgotLUFuZHkKCl9fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVu LWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cDovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVsCg==