linux-kernel - [tip: x86/urgent] x86/cpu/vmware: Use the full form of inl in VMWARE

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Message-ID: <157052874959.9978.17301270713258372970.tip-bot2@tip-bot2>
Date:   Tue, 08 Oct 2019 09:59:09 -0000
From:   "tip-bot2 for Sami Tolvanen" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Borislav Petkov <bp@...e.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        clang-built-linux@...glegroups.com,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        virtualization@...ts.linux-foundation.org,
        "VMware, Inc." <pv-drivers@...are.com>, "x86-ml" <x86@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/cpu/vmware: Use the full form of inl in VMWARE_PORT

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     b547c1fa97b030ac50586e8b187571b4a83d154c
Gitweb:        https://git.kernel.org/tip/b547c1fa97b030ac50586e8b187571b4a83d154c
Author:        Sami Tolvanen <samitolvanen@...gle.com>
AuthorDate:    Mon, 07 Oct 2019 12:21:29 -07:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 08 Oct 2019 11:52:35 +02:00

x86/cpu/vmware: Use the full form of inl in VMWARE_PORT

LLVM's assembler doesn't accept the short form

  inl (%%dx)

instruction, but instead insists on the output register to be explicitly
specified:

  <inline asm>:1:7: error: invalid operand for instruction
          inl (%dx)
             ^
  LLVM ERROR: Error parsing inline asm

Use the full form of the instruction to fix the build.

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Acked-by: Thomas Hellstrom <thellstrom@...are.com>
Cc: clang-built-linux@...glegroups.com
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: virtualization@...ts.linux-foundation.org
Cc: "VMware, Inc." <pv-drivers@...are.com>
Cc: x86-ml <x86@...nel.org>
Link: https://github.com/ClangBuiltLinux/linux/issues/734
Link: https://lkml.kernel.org/r/20191007192129.104336-1-samitolvanen@google.com
---
 arch/x86/kernel/cpu/vmware.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 9735139..46d7326 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -49,7 +49,7 @@
 #define VMWARE_CMD_VCPU_RESERVED 31
 
 #define VMWARE_PORT(cmd, eax, ebx, ecx, edx)				\
-	__asm__("inl (%%dx)" :						\
+	__asm__("inl (%%dx), %%eax" :					\
 		"=a"(eax), "=c"(ecx), "=d"(edx), "=b"(ebx) :		\
 		"a"(VMWARE_HYPERVISOR_MAGIC),				\
 		"c"(VMWARE_CMD_##cmd),					\