* [PATCH] test: emulator: lmsw may not clear cr0.pe
@ 2010-05-12 8:00 Avi Kivity
2010-05-13 22:02 ` Marcelo Tosatti
0 siblings, 1 reply; 2+ messages in thread
From: Avi Kivity @ 2010-05-12 8:00 UTC (permalink / raw)
To: Marcelo Tosatti, kvm
Signed-off-by: Avi Kivity <avi@redhat.com>
---
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] test: emulator: lmsw may not clear cr0.pe
2010-05-12 8:00 [PATCH] test: emulator: lmsw may not clear cr0.pe Avi Kivity
@ 2010-05-13 22:02 ` Marcelo Tosatti
0 siblings, 0 replies; 2+ messages in thread
From: Marcelo Tosatti @ 2010-05-13 22:02 UTC (permalink / raw)
To: Avi Kivity; +Cc: kvm
On Wed, May 12, 2010 at 11:00:10AM +0300, Avi Kivity wrote:
> Signed-off-by: Avi Kivity <avi@redhat.com>
> ---
> kvm/user/test/x86/emulator.c | 9 +++++++++
> 1 files changed, 9 insertions(+), 0 deletions(-)
Applied, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-05-12 8:00 [PATCH] test: emulator: lmsw may not clear cr0.pe Avi Kivity
2010-05-13 22:02 ` Marcelo Tosatti
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