From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A21D6C43331 for ; Fri, 6 Sep 2019 01:45:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8DBEC206A5 for ; Fri, 6 Sep 2019 01:45:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567734356; bh=CcVaQDFBcPv2lQF9bE3zujLhd2gzHtsZ9Io9bYLSvpc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=q7cScaU8nj6naJubm/OKD/mBfjCyF8KjmW6SL/pJ3B5fFrZdmQVCwX8Am5TW9Na9Z TGIH4DARPwG/TtKk43j3bgNH3N9eTJEAmEgb7uZ9kOleAeaK5OfShXRVld5N9wvEC6 mSzm1pcp4xD/LeiKyN5aTtNdKmBWhn34Vt7jppvA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404251AbfIFBpz (ORCPT ); Thu, 5 Sep 2019 21:45:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:33218 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727043AbfIFBpz (ORCPT ); Thu, 5 Sep 2019 21:45:55 -0400 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1980B206CD; Fri, 6 Sep 2019 01:45:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567734353; bh=CcVaQDFBcPv2lQF9bE3zujLhd2gzHtsZ9Io9bYLSvpc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YnU0wX4+sJ5qTazcOFj4HW1lwoMr2bqQjVLW2QiUm6uzNT2WuYRPhAH2m7wmKBTGY M3h2/K49RrAtmxMYp5Di2TlQm3uqOyGds62R4TsY35gjBFPxI6i1pX43PkB6335Vug xfo89gQNYQloMvxj7TLvBFn08yQWDHQie/mnOAVg= From: Masami Hiramatsu To: Ingo Molnar Cc: Josh Poimboeuf , Andrew Cooper , Peter Zijlstra , Randy Dunlap , Borislav Petkov , Juergen Gross , Boris Ostrovsky , Stefano Stabellini , x86@kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org Subject: [PATCH -tip v3 1/2] x86: xen: insn: Decode Xen and KVM emulate-prefix signature Date: Fri, 6 Sep 2019 10:45:48 +0900 Message-Id: <156773434815.31441.12739136439382289412.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <156773433821.31441.2905951246664148487.stgit@devnote2> References: <156773433821.31441.2905951246664148487.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Decode Xen and KVM's emulate-prefix signature by x86 insn decoder. It is called "prefix" but actually not x86 instruction prefix, so this adds insn.emulate_prefix_size field instead of reusing insn.prefixes. If x86 decoder finds a special sequence of instructions of XEN_EMULATE_PREFIX and 'ud2a; .ascii "kvm"', it just counts the length, set insn.emulate_prefix_size and fold it with the next instruction. In other words, the signature and the next instruction is treated as a single instruction. Reported-by: Josh Poimboeuf Signed-off-by: Masami Hiramatsu Acked-by: Josh Poimboeuf --- Changes in v3: - Fix perf's check script too. Changes in v2: - Generalize the emulate-prefix handling not only for Xen but KVM. - Introduce insn.emulate_prefix_size instead of using insn.prefixes. --- arch/x86/include/asm/insn.h | 6 +++++ arch/x86/include/asm/xen/interface.h | 7 ++++-- arch/x86/include/asm/xen/prefix.h | 10 +++++++++ arch/x86/lib/insn.c | 36 +++++++++++++++++++++++++++++++ tools/arch/x86/include/asm/insn.h | 6 +++++ tools/arch/x86/include/asm/xen/prefix.h | 10 +++++++++ tools/arch/x86/lib/insn.c | 36 +++++++++++++++++++++++++++++++ tools/objtool/sync-check.sh | 3 ++- tools/perf/check-headers.sh | 2 +- 9 files changed, 112 insertions(+), 4 deletions(-) create mode 100644 arch/x86/include/asm/xen/prefix.h create mode 100644 tools/arch/x86/include/asm/xen/prefix.h diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h index 154f27be8bfc..5c1ae3eff9d4 100644 --- a/arch/x86/include/asm/insn.h +++ b/arch/x86/include/asm/insn.h @@ -45,6 +45,7 @@ struct insn { struct insn_field immediate2; /* for 64bit imm or seg16 */ }; + int emulate_prefix_size; insn_attr_t attr; unsigned char opnd_bytes; unsigned char addr_bytes; @@ -128,6 +129,11 @@ static inline int insn_is_evex(struct insn *insn) return (insn->vex_prefix.nbytes == 4); } +static inline int insn_has_emulate_prefix(struct insn *insn) +{ + return !!insn->emulate_prefix_size; +} + /* Ensure this instruction is decoded completely */ static inline int insn_complete(struct insn *insn) { diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h index 62ca03ef5c65..fe33a9798708 100644 --- a/arch/x86/include/asm/xen/interface.h +++ b/arch/x86/include/asm/xen/interface.h @@ -379,12 +379,15 @@ struct xen_pmu_arch { * Prefix forces emulation of some non-trapping instructions. * Currently only CPUID. */ +#include + #ifdef __ASSEMBLY__ -#define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ; +#define XEN_EMULATE_PREFIX .byte __XEN_EMULATE_PREFIX ; #define XEN_CPUID XEN_EMULATE_PREFIX cpuid #else -#define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; " +#define XEN_EMULATE_PREFIX ".byte " __XEN_EMULATE_PREFIX_STR " ; " #define XEN_CPUID XEN_EMULATE_PREFIX "cpuid" + #endif #endif /* _ASM_X86_XEN_INTERFACE_H */ diff --git a/arch/x86/include/asm/xen/prefix.h b/arch/x86/include/asm/xen/prefix.h new file mode 100644 index 000000000000..f901be0d7a95 --- /dev/null +++ b/arch/x86/include/asm/xen/prefix.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _TOOLS_ASM_X86_XEN_PREFIX_H +#define _TOOLS_ASM_X86_XEN_PREFIX_H + +#include + +#define __XEN_EMULATE_PREFIX 0x0f,0x0b,0x78,0x65,0x6e +#define __XEN_EMULATE_PREFIX_STR __stringify(__XEN_EMULATE_PREFIX) + +#endif diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c index 0b5862ba6a75..b7eb50187db9 100644 --- a/arch/x86/lib/insn.c +++ b/arch/x86/lib/insn.c @@ -13,6 +13,9 @@ #include #include +/* For special Xen prefix */ +#include + /* Verify next sizeof(t) bytes can be on the same instruction */ #define validate_next(t, insn, n) \ ((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr) @@ -58,6 +61,37 @@ void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64) insn->addr_bytes = 4; } +static const insn_byte_t xen_prefix[] = { __XEN_EMULATE_PREFIX }; +/* See handle_ud()@arch/x86/kvm/x86.c */ +static const insn_byte_t kvm_prefix[] = "\xf\xbkvm"; + +static int __insn_get_emulate_prefix(struct insn *insn, + const insn_byte_t *prefix, size_t len) +{ + size_t i; + + for (i = 0; i < len; i++) { + if (peek_nbyte_next(insn_byte_t, insn, i) != prefix[i]) + goto err_out; + } + + insn->emulate_prefix_size = len; + insn->next_byte += len; + + return 1; + +err_out: + return 0; +} + +static void insn_get_emulate_prefix(struct insn *insn) +{ + if (__insn_get_emulate_prefix(insn, xen_prefix, sizeof(xen_prefix))) + return; + + __insn_get_emulate_prefix(insn, kvm_prefix, sizeof(kvm_prefix)); +} + /** * insn_get_prefixes - scan x86 instruction prefix bytes * @insn: &struct insn containing instruction @@ -76,6 +110,8 @@ void insn_get_prefixes(struct insn *insn) if (prefixes->got) return; + insn_get_emulate_prefix(insn); + nb = 0; lb = 0; b = peek_next(insn_byte_t, insn); diff --git a/tools/arch/x86/include/asm/insn.h b/tools/arch/x86/include/asm/insn.h index 37a4c390750b..568854b14d0a 100644 --- a/tools/arch/x86/include/asm/insn.h +++ b/tools/arch/x86/include/asm/insn.h @@ -45,6 +45,7 @@ struct insn { struct insn_field immediate2; /* for 64bit imm or seg16 */ }; + int emulate_prefix_size; insn_attr_t attr; unsigned char opnd_bytes; unsigned char addr_bytes; @@ -128,6 +129,11 @@ static inline int insn_is_evex(struct insn *insn) return (insn->vex_prefix.nbytes == 4); } +static inline int insn_has_emulate_prefix(struct insn *insn) +{ + return !!insn->emulate_prefix_size; +} + /* Ensure this instruction is decoded completely */ static inline int insn_complete(struct insn *insn) { diff --git a/tools/arch/x86/include/asm/xen/prefix.h b/tools/arch/x86/include/asm/xen/prefix.h new file mode 100644 index 000000000000..f901be0d7a95 --- /dev/null +++ b/tools/arch/x86/include/asm/xen/prefix.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _TOOLS_ASM_X86_XEN_PREFIX_H +#define _TOOLS_ASM_X86_XEN_PREFIX_H + +#include + +#define __XEN_EMULATE_PREFIX 0x0f,0x0b,0x78,0x65,0x6e +#define __XEN_EMULATE_PREFIX_STR __stringify(__XEN_EMULATE_PREFIX) + +#endif diff --git a/tools/arch/x86/lib/insn.c b/tools/arch/x86/lib/insn.c index 79e048f1d902..ce04e43e0749 100644 --- a/tools/arch/x86/lib/insn.c +++ b/tools/arch/x86/lib/insn.c @@ -13,6 +13,9 @@ #include "../include/asm/inat.h" #include "../include/asm/insn.h" +/* For special Xen prefix */ +#include "../include/asm/xen/prefix.h" + /* Verify next sizeof(t) bytes can be on the same instruction */ #define validate_next(t, insn, n) \ ((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr) @@ -58,6 +61,37 @@ void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64) insn->addr_bytes = 4; } +static const insn_byte_t xen_prefix[] = { __XEN_EMULATE_PREFIX }; +/* See handle_ud()@arch/x86/kvm/x86.c */ +static const insn_byte_t kvm_prefix[] = "\xf\xbkvm"; + +static int __insn_get_emulate_prefix(struct insn *insn, + const insn_byte_t *prefix, size_t len) +{ + size_t i; + + for (i = 0; i < len; i++) { + if (peek_nbyte_next(insn_byte_t, insn, i) != prefix[i]) + goto err_out; + } + + insn->emulate_prefix_size = len; + insn->next_byte += len; + + return 1; + +err_out: + return 0; +} + +static void insn_get_emulate_prefix(struct insn *insn) +{ + if (__insn_get_emulate_prefix(insn, xen_prefix, sizeof(xen_prefix))) + return; + + __insn_get_emulate_prefix(insn, kvm_prefix, sizeof(kvm_prefix)); +} + /** * insn_get_prefixes - scan x86 instruction prefix bytes * @insn: &struct insn containing instruction @@ -76,6 +110,8 @@ void insn_get_prefixes(struct insn *insn) if (prefixes->got) return; + insn_get_emulate_prefix(insn); + nb = 0; lb = 0; b = peek_next(insn_byte_t, insn); diff --git a/tools/objtool/sync-check.sh b/tools/objtool/sync-check.sh index 0a832e265a50..34143ea3d477 100755 --- a/tools/objtool/sync-check.sh +++ b/tools/objtool/sync-check.sh @@ -4,6 +4,7 @@ FILES=' arch/x86/include/asm/inat_types.h arch/x86/include/asm/orc_types.h +arch/x86/include/asm/xen/prefix.h arch/x86/lib/x86-opcode-map.txt arch/x86/tools/gen-insn-attr-x86.awk ' @@ -46,6 +47,6 @@ done check arch/x86/include/asm/inat.h '-I "^#include [\"<]\(asm/\)*inat_types.h[\">]"' check arch/x86/include/asm/insn.h '-I "^#include [\"<]\(asm/\)*inat.h[\">]"' check arch/x86/lib/inat.c '-I "^#include [\"<]\(../include/\)*asm/insn.h[\">]"' -check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]"' +check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/xen/prefix.h[\">]"' cd - diff --git a/tools/perf/check-headers.sh b/tools/perf/check-headers.sh index e2e0f06c97d0..edcffa55a826 100755 --- a/tools/perf/check-headers.sh +++ b/tools/perf/check-headers.sh @@ -115,7 +115,7 @@ check lib/ctype.c '-I "^EXPORT_SYMBOL" -I "^#include " -B check arch/x86/include/asm/inat.h '-I "^#include [\"<]\(asm/\)*inat_types.h[\">]"' check arch/x86/include/asm/insn.h '-I "^#include [\"<]\(asm/\)*inat.h[\">]"' check arch/x86/lib/inat.c '-I "^#include [\"<]\(../include/\)*asm/insn.h[\">]"' -check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]"' +check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/xen/prefix.h[\">]"' # diff non-symmetric files check_2 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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c=relaxed/simple; d=kernel.org; s=default; t=1567734353; bh=CcVaQDFBcPv2lQF9bE3zujLhd2gzHtsZ9Io9bYLSvpc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YnU0wX4+sJ5qTazcOFj4HW1lwoMr2bqQjVLW2QiUm6uzNT2WuYRPhAH2m7wmKBTGY M3h2/K49RrAtmxMYp5Di2TlQm3uqOyGds62R4TsY35gjBFPxI6i1pX43PkB6335Vug xfo89gQNYQloMvxj7TLvBFn08yQWDHQie/mnOAVg= From: Masami Hiramatsu To: Ingo Molnar Date: Fri, 6 Sep 2019 10:45:48 +0900 Message-Id: <156773434815.31441.12739136439382289412.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <156773433821.31441.2905951246664148487.stgit@devnote2> References: <156773433821.31441.2905951246664148487.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Subject: [Xen-devel] [PATCH -tip v3 1/2] x86: xen: insn: Decode Xen and KVM emulate-prefix signature X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Stefano Stabellini , Peter Zijlstra , Andrew Cooper , Randy Dunlap , x86@kernel.org, linux-kernel@vger.kernel.org, Borislav Petkov , Josh Poimboeuf , xen-devel@lists.xenproject.org, Boris Ostrovsky Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" RGVjb2RlIFhlbiBhbmQgS1ZNJ3MgZW11bGF0ZS1wcmVmaXggc2lnbmF0dXJlIGJ5IHg4NiBpbnNu IGRlY29kZXIuCkl0IGlzIGNhbGxlZCAicHJlZml4IiBidXQgYWN0dWFsbHkgbm90IHg4NiBpbnN0 cnVjdGlvbiBwcmVmaXgsIHNvCnRoaXMgYWRkcyBpbnNuLmVtdWxhdGVfcHJlZml4X3NpemUgZmll bGQgaW5zdGVhZCBvZiByZXVzaW5nCmluc24ucHJlZml4ZXMuCgpJZiB4ODYgZGVjb2RlciBmaW5k cyBhIHNwZWNpYWwgc2VxdWVuY2Ugb2YgaW5zdHJ1Y3Rpb25zIG9mClhFTl9FTVVMQVRFX1BSRUZJ WCBhbmQgJ3VkMmE7IC5hc2NpaSAia3ZtIicsIGl0IGp1c3QgY291bnRzIHRoZQpsZW5ndGgsIHNl dCBpbnNuLmVtdWxhdGVfcHJlZml4X3NpemUgYW5kIGZvbGQgaXQgd2l0aCB0aGUgbmV4dAppbnN0 cnVjdGlvbi4gSW4gb3RoZXIgd29yZHMsIHRoZSBzaWduYXR1cmUgYW5kIHRoZSBuZXh0IGluc3Ry 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