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

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Message-ID: <157169858708.29376.13468044937611817754.tip-bot2@tip-bot2>
Date:   Mon, 21 Oct 2019 22:56:27 -0000
From:   "tip-bot2 for Thomas Hellstrom" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        clang-built-linux@...glegroups.com, 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_HYPERCALL, for clang/llvm

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

Commit-ID:     db633a4e0e6eda69b6065e3e106f9ea13a0676c3
Gitweb:        https://git.kernel.org/tip/db633a4e0e6eda69b6065e3e106f9ea13a0676c3
Author:        Thomas Hellstrom <thellstrom@...are.com>
AuthorDate:    Mon, 21 Oct 2019 19:24:02 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 22 Oct 2019 00:51:44 +02:00

x86/cpu/vmware: Use the full form of INL in VMWARE_HYPERCALL, for clang/llvm

LLVM's assembler doesn't accept the short form INL instruction:

  inl (%%dx)

but instead insists on the output register to be explicitly specified.

This was previously fixed for the VMWARE_PORT macro. Fix it also for
the VMWARE_HYPERCALL macro.

Suggested-by: Sami Tolvanen <samitolvanen@...gle.com>
Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: clang-built-linux@...glegroups.com
Fixes: b4dd4f6e3648 ("Add a header file for hypercall definitions")
Link: https://lkml.kernel.org/r/20191021172403.3085-2-thomas_os@shipmail.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/vmware.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h
index e00c9e8..3caac90 100644
--- a/arch/x86/include/asm/vmware.h
+++ b/arch/x86/include/asm/vmware.h
@@ -29,7 +29,8 @@
 
 /* The low bandwidth call. The low word of edx is presumed clear. */
 #define VMWARE_HYPERCALL						\
-	ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT ", %%dx; inl (%%dx)", \
+	ALTERNATIVE_2("movw $" VMWARE_HYPERVISOR_PORT ", %%dx; "	\
+		      "inl (%%dx), %%eax",				\
 		      "vmcall", X86_FEATURE_VMCALL,			\
 		      "vmmcall", X86_FEATURE_VMW_VMMCALL)