From mboxrd@z Thu Jan 1 00:00:00 1970 From: Razvan Cojocaru Subject: [PATCH] xen: Don't disable the REP emulation optimizations for regular IO Date: Thu, 10 Mar 2016 12:07:23 +0200 Message-ID: <1457604443-32344-1-git-send-email-rcojocaru@bitdefender.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: xen-devel@lists.xen.org Cc: andrew.cooper3@citrix.com, keir@xen.org, Razvan Cojocaru , jbeulich@suse.com List-Id: xen-devel@lists.xenproject.org Q3VycmVudGx5IFJFUCBlbXVsYXRpb25zIG9wdGltaXphdGlvbnMgcmVtYWluIGRpc2FibGVkIGV2 ZW4gaWYKdGhlIGVtdWxhdGlvbiBkb2VzIG5vdCBoYXBwZW4gYXMgYSByZXN1bHQgb2YgYSB2bV9l dmVudCByZXBseQpyZXF1ZXN0aW9uIGVtdWxhdGlvbiAoaS5lLiBldmVuIGZvciByZWd1bGFyIElP KS4gVGhpcyBwYXRjaCB0YWtlcwplbXVsYXRlX2VhY2hfcmVwIGludG8gYWNjb3VudCBvbmx5IGlm IGVtdWxhdGlvbiBoYXMgYmVlbiByZXF1ZXN0ZWQKYnkgYSB2bV9ldmVudC1jYXBhYmxlIGFwcGxp Y2F0aW9uLCBhbmQgaXMgYSBub3RpY2VhYmxlIHNwZWVkCm9wdGltaXphdGlvbiBmb3IgbW9uaXRv cmVkIGd1ZXN0cy4KClNpZ25lZC1vZmYtYnk6IFJhenZhbiBDb2pvY2FydSA8cmNvam9jYXJ1QGJp dGRlZmVuZGVyLmNvbT4KLS0tCiB4ZW4vYXJjaC94ODYvaHZtL2VtdWxhdGUuYyB8IDE4ICsrKysr KysrKysrKy0tLS0tLQogMSBmaWxlIGNoYW5nZWQsIDEyIGluc2VydGlvbnMoKyksIDYgZGVsZXRp b25zKC0pCgpkaWZmIC0tZ2l0IGEveGVuL2FyY2gveDg2L2h2bS9lbXVsYXRlLmMgYi94ZW4vYXJj aC94ODYvaHZtL2VtdWxhdGUuYwppbmRleCAwODJhYTMwLi5kZGM4MDA3IDEwMDY0NAotLS0gYS94 ZW4vYXJjaC94ODYvaHZtL2VtdWxhdGUuYworKysgYi94ZW4vYXJjaC94ODYvaHZtL2VtdWxhdGUu YwpAQCAtNDk4LDYgKzQ5OCw3IEBAIHN0YXRpYyBpbnQgaHZtZW11bF92aXJ0dWFsX3RvX2xpbmVh cigKIHsKICAgICBzdHJ1Y3Qgc2VnbWVudF9yZWdpc3RlciAqcmVnOwogICAgIGludCBva2F5Owor ICAgIHVuc2lnbmVkIGxvbmcgbWF4X3JlcHMgPSA0MDk2OwogCiAgICAgaWYgKCBzZWcgPT0geDg2 X3NlZ19ub25lICkKICAgICB7CkBAIC01MDYsMTYgKzUwNywyMSBAQCBzdGF0aWMgaW50IGh2bWVt dWxfdmlydHVhbF90b19saW5lYXIoCiAgICAgfQogCiAgICAgLyoKKyAgICAgKiBJZiBpbnRyb3Nw ZWN0aW9uIGhhcyBiZWVuIGVuYWJsZWQgZm9yIHRoaXMgZG9tYWluLCBhbmQgd2UncmUgZW11bGF0 aW5nCisgICAgICogYmVjYXNlIGEgdm1fcmVwbHkgYXNrZWQgdXMgdG8gKGkuZS4gbm90IGRvaW5n IHJlZ3VsYXIgSU8pIHJlcHMgc2hvdWxkCisgICAgICogYmUgYXQgbW9zdCAxLCBzaW5jZSBvcHRp bWl6YXRpb24gbWlnaHQgb3RoZXJ3aXNlIGNhdXNlIGEgc2luZ2xlCisgICAgICogdm1fZXZlbnQg YmVpbmcgdHJpZ2dlcmVkIGZvciByZXBlYXRlZCB3cml0ZXMgdG8gYSB3aG9sZSBwYWdlLgorICAg ICAqLworICAgIGlmICggdW5saWtlbHkoY3VycmVudC0+ZG9tYWluLT5hcmNoLm1lbV9hY2Nlc3Nf ZW11bGF0ZV9lYWNoX3JlcCkgJiYKKyAgICAgICAgIGN1cnJlbnQtPmFyY2gudm1fZXZlbnQtPmVt dWxhdGVfZmxhZ3MgIT0gMCApCisgICAgICAgbWF4X3JlcHMgPSAxOworCisgICAgLyoKICAgICAg KiBDbGlwIHJlcGV0aXRpb25zIHRvIGF2b2lkIG92ZXJmbG93IHdoZW4gbXVsdGlwbHlpbmcgYnkg QGJ5dGVzX3Blcl9yZXAuCiAgICAgICogVGhlIGNob3NlbiBtYXhpbXVtIGlzIHZlcnkgY29uc2Vy dmF0aXZlIGJ1dCBpdCdzIHdoYXQgd2UgdXNlIGluCiAgICAgICogaHZtZW11bF9saW5lYXJfdG9f cGh5cygpIHNvIHRoZXJlIGlzIG5vIHBvaW50IGluIHVzaW5nIGEgbGFyZ2VyIHZhbHVlLgotICAg ICAqIElmIGludHJvc3BlY3Rpb24gaGFzIGJlZW4gZW5hYmxlZCBmb3IgdGhpcyBkb21haW4sICpy ZXBzIHNob3VsZCBiZQotICAgICAqIGF0IG1vc3QgMSwgc2luY2Ugb3B0aW1pemF0aW9uIG1pZ2h0 IG90aGVyd2lzZSBjYXVzZSBhIHNpbmdsZSB2bV9ldmVudAotICAgICAqIGJlaW5nIHRyaWdnZXJl ZCBmb3IgcmVwZWF0ZWQgd3JpdGVzIHRvIGEgd2hvbGUgcGFnZS4KICAgICAgKi8KLSAgICAqcmVw cyA9IG1pbl90KHVuc2lnbmVkIGxvbmcsICpyZXBzLAotICAgICAgICAgICAgICAgICAgdW5saWtl bHkoY3VycmVudC0+ZG9tYWluLT5hcmNoLm1lbV9hY2Nlc3NfZW11bGF0ZV9lYWNoX3JlcCkKLSAg ICAgICAgICAgICAgICAgICAgICAgICAgID8gMSA6IDQwOTYpOworICAgICpyZXBzID0gbWluX3Qo dW5zaWduZWQgbG9uZywgKnJlcHMsIG1heF9yZXBzKTsKIAogICAgIHJlZyA9IGh2bWVtdWxfZ2V0 X3NlZ19yZWcoc2VnLCBodm1lbXVsX2N0eHQpOwogCi0tIAoxLjkuMQoKCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QK WGVuLWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cDovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVsCg==