linux-kernel - [PATCH 1/2] x86/cpu/vmware: Use the full form of INL in VMWARE

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Date:   Fri, 18 Oct 2019 15:40:51 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Hellstrom <thellstrom@...are.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        clang-built-linux@...glegroups.com,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86-ml <x86@...nel.org>,
        Borislav Petkov <bp@...e.de>
Subject: [PATCH 1/2] x86/cpu/vmware: Use the full form of INL in VMWARE_HYPERCALL

From: Thomas Hellstrom <thellstrom@...are.com>

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.

Fixes: b4dd4f6e3648 ("Add a header file for hypercall definitions")
Suggested-by: Sami Tolvanen <samitolvanen@...gle.com>
Signed-off-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: x86-ml <x86@...nel.org>
Cc: Borislav Petkov <bp@...e.de>
---
 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 e00c9e875933..f5fbe3778aef 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)
 
-- 
2.21.0