From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [V2] x86/mce: Fix set_mce_nospec() to avoid #GP fault From: "Luck, Tony" Message-Id: <20180831165506.GA9605@agluck-desk> Date: Fri, 31 Aug 2018 09:55:06 -0700 To: Linus Torvalds Cc: Thomas Gleixner , Ingo Molnar , Peter Anvin , Borislav Petkov , linux-edac , Linux Kernel Mailing List , the arch/x86 maintainers , Dan Williams , Dave Jiang List-ID: VGhlIHRyaWNrIHdpdGggZmxpcHBpbmcgYml0IDYzIHRvIGF2b2lkIGxvYWRpbmcgdGhlIGFkZHJl c3Mgb2YgdGhlCjE6MSBtYXBwaW5nIG9mIHRoZSBwb2lzb25lZCBwYWdlIHdoaWxlIHdlIHVwZGF0 ZSB0aGUgMToxIG1hcCB1c2VkCnRvIHdvcmsgd2hlbiB3ZSB3YW50ZWQgdG8gdW5tYXAgdGhlIHBh Z2UuIEJ1dCBpdCBmYWxscyBkb3duIGhvcnJpYmx5CndoZW4gd2UgdHJ5IHRvIGRpcmVjdGx5IHNl dCB0aGUgcGFnZSBhcyB1bmNhY2hlYWJsZS4KClRoZSBwcm9ibGVtIGlzIHRoYXQgd2hlbiB3ZSBj aGFuZ2UgdGhlIGNhY2hlIG1vZGUgdG8gdW5jYWNoYWJsZSB3ZQp0cnkgdG8gZmx1c2ggdGhlIHBh Z2UgZnJvbSB0aGUgY2FjaGUuIEJ1dCB0aGUgZGVjb3kgYWRkcmVzcyBpcwpub24tY2Fub25pY2Fs LCBhbmQgdGhlIENMRkxVU0ggaW5zdHJ1Y3Rpb24gdGhyb3dzIGEgI0dQIGZhdWx0LgoKQWRkIGNv ZGUgdG8gY2hhbmdlX3BhZ2VfYXR0cl9zZXRfY2xyKCkgdG8gZml4IHRoZSBhZGRyZXNzCmJlZm9y ZSBjYWxsaW5nIGZsdXNoLgoKRml4ZXM6IDI4NGNlNDAxMWJhNiAoIng4Ni9tZW1vcnlfZmFpbHVy ZTogSW50cm9kdWNlIHtzZXQsIGNsZWFyfV9tY2Vfbm9zcGVjKCkiKQpTdWdnZXN0ZWQtYnk6IExp bnVzIFRvcnZhbGRzIDx0b3J2YWxkc0BsaW51eC1mb3VuZGF0aW9uLm9yZz4KU2lnbmVkLW9mZi1i eTogVG9ueSBMdWNrIDx0b255Lmx1Y2tAaW50ZWwuY29tPgotLS0KClRoZSBtYWdpYyBjb2RlIHRv IG1ha2UgYWRkcmVzcyBjYW5vbmljYWwgd291bGQgbWVzcyB1cCAzMi1iaXQgKHdoaWNoCmRvZXNu J3QgcGxheSB0aGVzZSBnYW1lcykuICBTbyBJIG1hZGUgYW4gaW5saW5lIGZ1bmN0aW9uLiBJJ3Zl IHB1dCBpdAppbiBwYWdlYXR0ci5jIGFzIEkgZG9uJ3QgZXhwZWN0IGFueXdoZXJlIGVsc2UgdG8g bmVlZCB0aGlzLiBJZiB0aGUgI2lmZGVmCmluIGEgIi5jIiBmaWxlIG9mZmVuZHMgdG9vIGJhZGx5 IGl0IGNhbiBtb3ZlIHRvIHNvbWUgIi5oIiBmaWxlLgoKIGFyY2gveDg2L21tL3BhZ2VhdHRyLmMg fCAyNSArKysrKysrKysrKysrKysrKysrKysrKystCiAxIGZpbGUgY2hhbmdlZCwgMjQgaW5zZXJ0 aW9ucygrKSwgMSBkZWxldGlvbigtKQoKZGlmZiAtLWdpdCBhL2FyY2gveDg2L21tL3BhZ2VhdHRy LmMgYi9hcmNoL3g4Ni9tbS9wYWdlYXR0ci5jCmluZGV4IDhkNmMzNGZlNDliZS4uNTFhNWE2OWVj YWM5IDEwMDY0NAotLS0gYS9hcmNoL3g4Ni9tbS9wYWdlYXR0ci5jCisrKyBiL2FyY2gveDg2L21t L3BhZ2VhdHRyLmMKQEAgLTE0MjAsNiArMTQyMCwyOSBAQCBzdGF0aWMgaW50IF9fY2hhbmdlX3Bh Z2VfYXR0cl9zZXRfY2xyKHN0cnVjdCBjcGFfZGF0YSAqY3BhLCBpbnQgY2hlY2thbGlhcykKIAly ZXR1cm4gMDsKIH0KIAorLyoKKyAqIE1hY2hpbmUgY2hlY2sgcmVjb3ZlcnkgY29kZSBuZWVkcyB0 byBjaGFuZ2UgY2FjaGUgbW9kZSBvZiBwb2lzb25lZAorICogcGFnZXMgdG8gVUMgdG8gYXZvaWQg c3BlY3VsYXRpdmUgYWNjZXNzIGxvZ2dpbmcgYW5vdGhlciBlcnJvci4gQnV0CisgKiBwYXNzaW5n IHRoZSBhZGRyZXNzIG9mIHRoZSAxOjEgbWFwcGluZyB0byBzZXRfbWVtb3J5X3VjKCkgaXMgYSBm aW5lCisgKiB3YXkgdG8gZW5jb3VyYWdlIGEgc3BlY3VsYXRpdmUgYWNjZXNzLiBTbyB3ZSBjaGVh dCBhbmQgZmxpcCB0aGUgdG9wCisgKiBiaXQgb2YgdGhlIGFkZHJlc3MuIFRoaXMgd29ya3MgZmlu ZSBmb3IgdGhlIGNvZGUgdGhhdCB1cGRhdGVzIHRoZQorICogcGFnZSB0YWJsZXMuIEJ1dCBhdCB0 aGUgZW5kIG9mIHRoZSBwcm9jZXNzIHdlIG5lZWQgdG8gZmx1c2ggdGhlIGNhY2hlCisgKiBhbmQg dGhlIG5vbi1jYW5vbmljYWwgYWRkcmVzcyBjYXVzZXMgYSAjR1AgZmF1bHQgd2hlbiB1c2VkIGJ5 IHRoZQorICogQ0xGTFVTSCBpbnN0cnVjdGlvbi4KKyAqCisgKiBCdXQgaW4gdGhlIGNvbW1vbiBj YXNlIHdlIGFscmVhZHkgaGF2ZSBhIGNhbm9uaWNhbCBhZGRyZXNzLiBUaGlzIGNvZGUKKyAqIHdp bGwgZml4IHRoZSB0b3AgYml0IGlmIG5lZWRlZCBhbmQgaXMgYSBuby1vcCBvdGhlcndpc2UuCisg Ki8KK3N0YXRpYyBpbmxpbmUgdW5zaWduZWQgbG9uZyBtYWtlX2FkZHJfY2Fub25pY2FsX2FnYWlu KHVuc2lnbmVkIGxvbmcgYWRkcikKK3sKKyNpZmRlZiBDT05GSUdfWDg2XzY0CisJcmV0dXJuIChs b25nKShhZGRyIDw8IDEpID4+IDE7CisjZWxzZQorCXJldHVybiBhZGRyOworI2VuZGlmCit9CisK Kwogc3RhdGljIGludCBjaGFuZ2VfcGFnZV9hdHRyX3NldF9jbHIodW5zaWduZWQgbG9uZyAqYWRk ciwgaW50IG51bXBhZ2VzLAogCQkJCSAgICBwZ3Byb3RfdCBtYXNrX3NldCwgcGdwcm90X3QgbWFz a19jbHIsCiAJCQkJICAgIGludCBmb3JjZV9zcGxpdCwgaW50IGluX2ZsYWcsCkBAIC0xNDY1LDcg KzE0ODgsNyBAQCBzdGF0aWMgaW50IGNoYW5nZV9wYWdlX2F0dHJfc2V0X2Nscih1bnNpZ25lZCBs b25nICphZGRyLCBpbnQgbnVtcGFnZXMsCiAJCSAqIFNhdmUgYWRkcmVzcyBmb3IgY2FjaGUgZmx1 c2guICphZGRyIGlzIG1vZGlmaWVkIGluIHRoZSBjYWxsCiAJCSAqIHRvIF9fY2hhbmdlX3BhZ2Vf YXR0cl9zZXRfY2xyKCkgYmVsb3cuCiAJCSAqLwotCQliYWRkciA9ICphZGRyOworCQliYWRkciA9 IG1ha2VfYWRkcl9jYW5vbmljYWxfYWdhaW4oKmFkZHIpOwogCX0KIAogCS8qIE11c3QgYXZvaWQg YWxpYXNpbmcgbWFwcGluZ3MgaW4gdGhlIGhpZ2htZW0gY29kZSAqLwo=