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From: Paolo Bonzini <pbonzini@redhat.com>
To: kvm@vger.kernel.org
Cc: thuth@redhat.com
Subject: [PATCH kvm-unit-tests] x86: disable SSE on 32-bit hosts
Date: Tue, 16 Jun 2020 10:02:17 -0400	[thread overview]
Message-ID: <20200616140217.104362-1-pbonzini@redhat.com> (raw)

On 64-bit hosts we are disabling SSE and SSE2.  Depending on the
compiler however it may use movq instructions for 64-bit transfers
even when targeting 32-bit processors; when CR4.OSFXSR is not set,
this results in an undefined opcode exception, so tell the compiler
to avoid those instructions on 32-bit hosts as well.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 x86/Makefile.i386 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/x86/Makefile.i386 b/x86/Makefile.i386
index d801b80..be9d6bc 100644
--- a/x86/Makefile.i386
+++ b/x86/Makefile.i386
@@ -1,6 +1,7 @@
 cstart.o = $(TEST_DIR)/cstart.o
 bits = 32
 ldarch = elf32-i386
+COMMON_CFLAGS += -mno-sse -mno-sse2
 
 cflatobjs += lib/x86/setjmp32.o
 
-- 
2.26.2


             reply	other threads:[~2020-06-16 14:02 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16 14:02 Paolo Bonzini [this message]
2020-06-16 15:17 ` [PATCH kvm-unit-tests] x86: disable SSE on 32-bit hosts Thomas Huth
2020-06-23  9:45   ` Paolo Bonzini

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