From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH] test: emulator: lmsw may not clear cr0.pe Date: Wed, 12 May 2010 11:00:10 +0300 Message-ID: <1273651210-29007-1-git-send-email-avi@redhat.com> To: Marcelo Tosatti , kvm@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:28790 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752344Ab0ELIAO (ORCPT ); Wed, 12 May 2010 04:00:14 -0400 Received: from int-mx05.intmail.prod.int.phx2.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.18]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o4C80DrC017608 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 12 May 2010 04:00:13 -0400 Received: from cleopatra.tlv.redhat.com (cleopatra.tlv.redhat.com [10.35.255.11]) by int-mx05.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o4C80B09020995 for ; Wed, 12 May 2010 04:00:11 -0400 Sender: kvm-owner@vger.kernel.org List-ID: Signed-off-by: Avi Kivity --- kvm/user/test/x86/emulator.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/kvm/user/test/x86/emulator.c b/kvm/user/test/x86/emulator.c index 5406062..e677e3a 100644 --- a/kvm/user/test/x86/emulator.c +++ b/kvm/user/test/x86/emulator.c @@ -267,6 +267,15 @@ void test_lmsw(void) asm("lmsw %0" : : "m"(*pmsw)); printf("before %lx after %lx\n", cr0, read_cr0()); report("lmsw (2)", cr0 == read_cr0()); + + /* lmsw can't clear cr0.pe */ + msw = (cr0 & ~1ul) ^ 4; /* change EM to force trap */ + asm("lmsw %0" : : "r"(msw)); + report("lmsw (3)", (cr0 ^ read_cr0()) == 4 && (cr0 & 1)); + + /* back to normal */ + msw = cr0; + asm("lmsw %0" : : "r"(msw)); } int main() -- 1.7.0.4