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([2001:a61:2482:101:a081:4793:30bf:f3d5]) by smtp.gmail.com with ESMTPSA id p8sm26809589wre.11.2020.05.13.05.06.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 May 2020 05:06:38 -0700 (PDT) Subject: Re: [PATCH 10/14] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for SPECULATION_CTRL prctls To: Dave Martin References: <1589301419-24459-1-git-send-email-Dave.Martin@arm.com> <1589301419-24459-11-git-send-email-Dave.Martin@arm.com> <20200513114915.GL21779@arm.com> From: "Michael Kerrisk (man-pages)" Message-ID: <604879eb-1c7e-d08b-a6b8-165e4259b60c@gmail.com> Date: Wed, 13 May 2020 14:06:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200513114915.GL21779@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200513_050641_345329_160B4AF1 X-CRM114-Status: GOOD ( 20.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, linux-man@vger.kernel.org, mtk.manpages@gmail.com, Thomas Gleixner , Tim Chen , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gNS8xMy8yMCAxOjQ5IFBNLCBEYXZlIE1hcnRpbiB3cm90ZToKPiBPbiBXZWQsIE1heSAxMywg MjAyMCBhdCAwMToyMToxMlBNICswMjAwLCBNaWNoYWVsIEtlcnJpc2sgKG1hbi1wYWdlcykgd3Jv dGU6Cj4+IEhlbGxvIERhdmUsCj4+Cj4+IE9uIDUvMTIvMjAgNjozNiBQTSwgRGF2ZSBNYXJ0aW4g d3JvdGU6Cj4+PiBBZGQgdGhlIFBSX1NQRUNfSU5ESVJFQ1RfQlJBTkNIICJtaXNmZWF0dXJlIiBh ZGRlZCBpbiBMaW51eCA0LjIwCj4+PiBmb3IgUFJfU0VUX1NQRUNVTEFUSU9OX0NUUkwgYW5kIFBS X0dFVF9TUEVDVUxBVElPTl9DVFJMLgo+Pj4KPj4+IFNpZ25lZC1vZmYtYnk6IERhdmUgTWFydGlu IDxEYXZlLk1hcnRpbkBhcm0uY29tPgo+Pj4gQ2M6IFRpbSBDaGVuIDx0aW0uYy5jaGVuQGxpbnV4 LmludGVsLmNvbT4KPj4+IENjOiBUaG9tYXMgR2xlaXhuZXIgPHRnbHhAbGludXRyb25peC5kZT4K Pj4KPj4gVGhhbmtzLiBQYXRjaCBhcHBsaWVkLCBidXQgbm90IHlldCBwdXNoZWQgd2hpbGUgSSB3 YWl0IHRvIHNlZSBpZiBhbnkKPj4gUmV2aWV3L0FjayBhcnJpdmVzLgo+Pgo+PiBBbHNvLCBjb3Vs ZCB5b3UgcGxlYXNlIGNoZWNrIHRoZSB0d2Vha3MgSSBub3RlIGJlbG93Lgo+Pgo+Pj4gLS0tCj4+ PiAgbWFuMi9wcmN0bC4yIHwgMjQgKysrKysrKysrKysrKysrKysrLS0tLS0tCj4+PiAgMSBmaWxl IGNoYW5nZWQsIDE4IGluc2VydGlvbnMoKyksIDYgZGVsZXRpb25zKC0pCj4+Pgo+Pj4gZGlmZiAt LWdpdCBhL21hbjIvcHJjdGwuMiBiL21hbjIvcHJjdGwuMgo+Pj4gaW5kZXggZThlYWY5NS4uNjY0 MTdjZiAxMDA2NDQKPj4+IC0tLSBhL21hbjIvcHJjdGwuMgo+Pj4gKysrIGIvbWFuMi9wcmN0bC4y Cj4+PiBAQCAtMTIxMywxMSArMTIxMywyMCBAQCBhcmd1bWVudHMgbXVzdCBiZSBzcGVjaWZpZWQg YXMgMDsgb3RoZXJ3aXNlIHRoZSBjYWxsIGZhaWxzIHdpdGggdGhlIGVycm9yCj4+PiAgLlwiIGNv bW1pdCAzNTZlNGJmZmYyYzU0ODllMDE2ZmRiOTI1YWRiZjEyYTFlMzk1MGVlCj4+PiAgU2V0cyB0 aGUgc3RhdGUgb2YgdGhlIHNwZWN1bGF0aW9uIG1pc2ZlYXR1cmUgc3BlY2lmaWVkIGluCj4+PiAg LklSIGFyZzIgLgo+Pj4gLUN1cnJlbnRseSwgdGhlIG9ubHkgcGVybWl0dGVkIHZhbHVlIGZvciB0 aGlzIGFyZ3VtZW50IGlzCj4+PiArQ3VycmVudGx5LCB0aGlzIGFyZ3VtZW50IG11c3QgYmUgb25l IG9mOgo+Pj4gKy5SUwo+Pj4gKy5UUAo+Pj4gIC5CIFBSX1NQRUNfU1RPUkVfQllQQVNTCj4+PiAt KG90aGVyd2lzZSB0aGUgY2FsbCBmYWlscyB3aXRoIHRoZSBlcnJvcgo+Pj4gK3NwZWN1bGF0aXZl IHN0b3JlIGJ5cGFzcyBjb250cm9sLCBvcgo+Pgo+PiBzL3NwZWN1bGF0aXZlL2VuYWJsZSBzcGVj dWxhdGl2ZS8KPj4KPj4+ICsuXCIgY29tbWl0IDkxMzdiYjI3ZTYwZTU1NGRhYjY5NGVhZmE0Y2Nh MjQxZmEzYTY5NGYKPj4+ICsuVFAKPj4+ICsuQlIgUFJfU1BFQ19JTkRJUkVDVF9CUkFOQ0ggIiAo c2luY2UgTGludXggNC4yMCkiCj4+PiAraW5kaXJlY3QgYnJhbmNoIHNwZWN1bGF0aW9uIGNvbnRy b2wuCj4+Cj4+IHMvaW5kaXJlY3QvZW5hYmxlIGluZGlyZWN0Lwo+IAo+IFRoYXQgZG9lc24ndCBz ZWVtIHF1aXRlIHJpZ2h0LgoKTXkgZ29vZiwgbm90IGxvb2tpbmcgYXQgdGhlIGJpZ2dlciBjb250 ZXh0IG9mIHRoZSBwYXRjaC4KCj4gCj4gYXJnMiBqdXN0IGlkZW50aWZpZXMgd2hhdCBiZWhhdmlv dXIgdG8gY29uZmlndXJlLgo+IEl0J3MgYXJnMyB0aGF0IHNheXMgd2hldGhlciB0byBkaXNhYmxl IC8gZW5hYmxlIGl0IG9yIHdoYXRldmVyLgo+IAo+IAo+IFdoaWxlIGVkaXRpbmcgdGhpcyBJIGRp ZCB3b25kZXIgd2hldGhlciB0aGUgImNvbnRyb2wiIHdhcyBoZWxwZnVsLgo+IE1heWJlIGp1c3Qg ZHJvcHBpbmcgdGhhdCB3b3JkIGZyb20gdGhlc2UgZW50cmllcyB3b3VsZCBoZWxwLgoKT2theSBJ IHRyaWVkIHRvIGZpeCB0aGluZ3MsIGFuZCBtYWRlIGFsc28gc29tZSBvdGhlciBlZGl0cy4KSG93 IGRvZXMgdGhlIGZvbGxvd2luZyBsb29rIHRvIHlvdT8KCiAgICAgIFBSX1NFVF9TUEVDVUxBVElP Tl9DVFJMIChzaW5jZSBMaW51eCA0LjE3KQogICAgICAgICAgICAgIFNldHMgdGhlIHN0YXRlIG9m IHRoZSBzcGVjdWxhdGlvbiBtaXNmZWF0dXJlICBzcGVjaWZpZWQgIGluCiAgICAgICAgICAgICAg YXJnMi4gICBUaGUgIHNwZWN1bGF0aW9uLW1pc2ZlYXR1cmUgc2V0dGluZ3MgYXJlIHBlci10aHJl YWQKICAgICAgICAgICAgICBhdHRyaWJ1dGVzLgoKICAgICAgICAgICAgICBDdXJyZW50bHksIGFy ZzIgbXVzdCBiZSBvbmUgb2Y6CgogICAgICAgICAgICAgIFBSX1NQRUNfU1RPUkVfQllQQVNTCiAg ICAgICAgICAgICAgICAgICAgIFNldCB0aGUgc3RhdGUgb2YgdGhlIHNwZWN1bGF0aXZlIHN0b3Jl ICBieXBhc3MgIG1pc+KAkAogICAgICAgICAgICAgICAgICAgICBmZWF0dXJlLgoKICAgICAgICAg ICAgICBQUl9TUEVDX0lORElSRUNUX0JSQU5DSCAoc2luY2UgTGludXggNC4yMCkKICAgICAgICAg ICAgICAgICAgICAgU2V0ICB0aGUgIHN0YXRlICBvZiAgdGhlIGluZGlyZWN0IGJyYW5jaCBzcGVj dWxhdGlvbgogICAgICAgICAgICAgICAgICAgICBtaXNmZWF0dXJlLgoKICAgICAgICAgICAgICBJ ZiBhcmcyIGRvZXMgbm90IGhhdmUgb25lIG9mIHRoZSAgYWJvdmUgIHZhbHVlcywgIHRoZW4gIHRo ZQogICAgICAgICAgICAgIGNhbGwgZmFpbHMgd2l0aCB0aGUgZXJyb3IgRU5PREVWLgoKICAgICAg ICAgICAgICBUaGUgIGFyZzMgIGFyZ3VtZW50ICBpcyAgdXNlZCB0byBoYW5kIGluIHRoZSBjb250 cm9sIHZhbHVlLAogICAgICAgICAgICAgIHdoaWNoIGlzIG9uZSBvZiB0aGUgZm9sbG93aW5nOgoK ICAgICAgICAgICAgICAuLi4KCkNoZWVycywKCk1pY2hhZWwKCgotLSAKTWljaGFlbCBLZXJyaXNr CkxpbnV4IG1hbi1wYWdlcyBtYWludGFpbmVyOyBodHRwOi8vd3d3Lmtlcm5lbC5vcmcvZG9jL21h bi1wYWdlcy8KTGludXgvVU5JWCBTeXN0ZW0gUHJvZ3JhbW1pbmcgVHJhaW5pbmc6IGh0dHA6Ly9t YW43Lm9yZy90cmFpbmluZy8KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxA bGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xp c3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK