From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: [PATCH 10/10] x86/spec_ctrl: Elide MSR_SPEC_CTRL handling in idle context when possible Date: Fri, 11 May 2018 11:38:14 +0100 Message-ID: <1526035094-14343-11-git-send-email-andrew.cooper3@citrix.com> References: <1526035094-14343-1-git-send-email-andrew.cooper3@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1526035094-14343-1-git-send-email-andrew.cooper3@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Xen-devel Cc: Juergen Gross , Andrew Cooper , Wei Liu , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= List-Id: xen-devel@lists.xenproject.org SWYgWGVuIGlzIHZpcnR1YWxpc2luZyBNU1JfU1BFQ19DVFJMIGhhbmRsaW5nIGZvciBndWVzdHMs IGJ1dCB1c2luZyAwIGFzIGl0cwpvd24gTVNSX1NQRUNfQ1RSTCB2YWx1ZSwgc3BlY19jdHJsX3tl bnRlcixleGl0fV9pZGxlKCkgbmVlZCBub3Qgd3JpdGUgdG8gdGhlCk1TUi4KClJlcXVlc3RlZC1i eTogSmFuIEJldWxpY2ggPEpCZXVsaWNoQHN1c2UuY29tPgpTaWduZWQtb2ZmLWJ5OiBBbmRyZXcg Q29vcGVyIDxhbmRyZXcuY29vcGVyM0BjaXRyaXguY29tPgotLS0KQ0M6IEphbiBCZXVsaWNoIDxK QmV1bGljaEBzdXNlLmNvbT4KQ0M6IFdlaSBMaXUgPHdlaS5saXUyQGNpdHJpeC5jb20+CkNDOiBS b2dlciBQYXUgTW9ubsOpIDxyb2dlci5wYXVAY2l0cml4LmNvbT4KQ0M6IEp1ZXJnZW4gR3Jvc3Mg PGpncm9zc0BzdXNlLmNvbT4KLS0tCiB4ZW4vYXJjaC94ODYvc3BlY19jdHJsLmMgICAgICAgICAg fCA0ICsrKysKIHhlbi9pbmNsdWRlL2FzbS14ODYvY3B1ZmVhdHVyZXMuaCB8IDEgKwogeGVuL2lu Y2x1ZGUvYXNtLXg4Ni9zcGVjX2N0cmwuaCAgIHwgOCArKy0tLS0tLQogMyBmaWxlcyBjaGFuZ2Vk LCA3IGluc2VydGlvbnMoKyksIDYgZGVsZXRpb25zKC0pCgpkaWZmIC0tZ2l0IGEveGVuL2FyY2gv eDg2L3NwZWNfY3RybC5jIGIveGVuL2FyY2gveDg2L3NwZWNfY3RybC5jCmluZGV4IGEyMzI4YmQu LmY0YTMxNjUgMTAwNjQ0Ci0tLSBhL3hlbi9hcmNoL3g4Ni9zcGVjX2N0cmwuYworKysgYi94ZW4v YXJjaC94ODYvc3BlY19jdHJsLmMKQEAgLTUyNiw2ICs1MjYsMTAgQEAgdm9pZCBfX2luaXQgaW5p dF9zcGVjdWxhdGlvbl9taXRpZ2F0aW9ucyh2b2lkKQogICAgIC8qIChSZSlpbml0IEJTUCBzdGF0 ZSBub3cgdGhhdCBkZWZhdWx0X3NwZWNfY3RybF9mbGFncyBoYXMgYmVlbiBjYWxjdWxhdGVkLiAq LwogICAgIGluaXRfc2hhZG93X3NwZWNfY3RybF9zdGF0ZSgpOwogCisgICAgLyogSWYgWGVuIGlz IHVzaW5nIGFueSBNU1JfU1BFQ19DVFJMIHNldHRpbmdzLCBhZGp1c3QgdGhlIGlkbGUgcGF0aC4g Ki8KKyAgICBpZiAoIGRlZmF1bHRfeGVuX3NwZWNfY3RybCApCisgICAgICAgIHNldHVwX2ZvcmNl X2NwdV9jYXAoWDg2X0ZFQVRVUkVfU0NfTVNSX0lETEUpOworCiAgICAgeHB0aV9pbml0X2RlZmF1 bHQoZmFsc2UpOwogICAgIGlmICggb3B0X3hwdGkgPT0gMCApCiAgICAgICAgIHNldHVwX2ZvcmNl X2NwdV9jYXAoWDg2X0ZFQVRVUkVfTk9fWFBUSSk7CmRpZmYgLS1naXQgYS94ZW4vaW5jbHVkZS9h c20teDg2L2NwdWZlYXR1cmVzLmggYi94ZW4vaW5jbHVkZS9hc20teDg2L2NwdWZlYXR1cmVzLmgK aW5kZXggOWQ1ZDgxZS4uYjkwYWEyZCAxMDA2NDQKLS0tIGEveGVuL2luY2x1ZGUvYXNtLXg4Ni9j cHVmZWF0dXJlcy5oCisrKyBiL3hlbi9pbmNsdWRlL2FzbS14ODYvY3B1ZmVhdHVyZXMuaApAQCAt MzEsMyArMzEsNCBAQCBYRU5fQ1BVRkVBVFVSRShTQ19NU1JfSFZNLCAgICAgIChGU0NBUElOVFMr MCkqMzIrMTcpIC8qIE1TUl9TUEVDX0NUUkwgdXNlZCBieSBYZQogWEVOX0NQVUZFQVRVUkUoU0Nf UlNCX1BWLCAgICAgICAoRlNDQVBJTlRTKzApKjMyKzE4KSAvKiBSU0Igb3ZlcndyaXRlIG5lZWRl ZCBmb3IgUFYgKi8KIFhFTl9DUFVGRUFUVVJFKFNDX1JTQl9IVk0sICAgICAgKEZTQ0FQSU5UUysw KSozMisxOSkgLyogUlNCIG92ZXJ3cml0ZSBuZWVkZWQgZm9yIEhWTSAqLwogWEVOX0NQVUZFQVRV UkUoTk9fWFBUSSwgICAgICAgICAoRlNDQVBJTlRTKzApKjMyKzIwKSAvKiBYUFRJIG1pdGlnYXRp b24gbm90IGluIHVzZSAqLworWEVOX0NQVUZFQVRVUkUoU0NfTVNSX0lETEUsICAgICAoRlNDQVBJ TlRTKzApKjMyKzIxKSAvKiAoU0NfTVNSX1BWIHx8IFNDX01TUl9IVk0pICYmIGRlZmF1bHRfeGVu X3NwZWNfY3RybCAqLwpkaWZmIC0tZ2l0IGEveGVuL2luY2x1ZGUvYXNtLXg4Ni9zcGVjX2N0cmwu aCBiL3hlbi9pbmNsdWRlL2FzbS14ODYvc3BlY19jdHJsLmgKaW5kZXggYmI0ZTdiMi4uOTkzYjk1 OCAxMDA2NDQKLS0tIGEveGVuL2luY2x1ZGUvYXNtLXg4Ni9zcGVjX2N0cmwuaAorKysgYi94ZW4v aW5jbHVkZS9hc20teDg2L3NwZWNfY3RybC5oCkBAIC01OCw5ICs1OCw3IEBAIHN0YXRpYyBhbHdh eXNfaW5saW5lIHZvaWQgc3BlY19jdHJsX2VudGVyX2lkbGUoc3RydWN0IGNwdV9pbmZvICppbmZv KQogICAgIGJhcnJpZXIoKTsKICAgICBpbmZvLT5zcGVjX2N0cmxfZmxhZ3MgfD0gU0NGX3VzZV9z aGFkb3c7CiAgICAgYmFycmllcigpOwotICAgIGFzbSB2b2xhdGlsZSAoIEFMVEVSTkFUSVZFXzIo QVNNX05PUDMsCi0gICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAid3Jtc3IiLCBYODZf RkVBVFVSRV9TQ19NU1JfUFYsCi0gICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAid3Jt c3IiLCBYODZfRkVBVFVSRV9TQ19NU1JfSFZNKQorICAgIGFzbSB2b2xhdGlsZSAoIEFMVEVSTkFU SVZFKEFTTV9OT1AzLCAid3Jtc3IiLCBYODZfRkVBVFVSRV9TQ19NU1JfSURMRSkKICAgICAgICAg ICAgICAgICAgICA6OiAiYSIgKHZhbCksICJjIiAoTVNSX1NQRUNfQ1RSTCksICJkIiAoMCkgOiAi bWVtb3J5IiApOwogfQogCkBAIC03NSw5ICs3Myw3IEBAIHN0YXRpYyBhbHdheXNfaW5saW5lIHZv aWQgc3BlY19jdHJsX2V4aXRfaWRsZShzdHJ1Y3QgY3B1X2luZm8gKmluZm8pCiAgICAgICovCiAg ICAgaW5mby0+c3BlY19jdHJsX2ZsYWdzICY9IH5TQ0ZfdXNlX3NoYWRvdzsKICAgICBiYXJyaWVy KCk7Ci0gICAgYXNtIHZvbGF0aWxlICggQUxURVJOQVRJVkVfMihBU01fTk9QMywKLSAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICJ3cm1zciIsIFg4Nl9GRUFUVVJFX1NDX01TUl9QViwK LSAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICJ3cm1zciIsIFg4Nl9GRUFUVVJFX1ND X01TUl9IVk0pCisgICAgYXNtIHZvbGF0aWxlICggQUxURVJOQVRJVkUoQVNNX05PUDMsICJ3cm1z ciIsIFg4Nl9GRUFUVVJFX1NDX01TUl9JRExFKQogICAgICAgICAgICAgICAgICAgIDo6ICJhIiAo dmFsKSwgImMiIChNU1JfU1BFQ19DVFJMKSwgImQiICgwKSA6ICJtZW1vcnkiICk7CiB9CiAKLS0g CjIuMS40CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K WGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0 cHM6Ly9saXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZlbA==