From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zhu Yijun <zhuyijun@huawei.com>
Subject: [question kvm-unit-tests] FAIL about apic testcase
Date: Tue, 12 Apr 2016 21:34:53 +0800
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Cc: <oscar.zhangbo@huawei.com>, Hangaohuai <hangaohuai@huawei.com>
To: <kvm@vger.kernel.org>, Paolo Bonzini <pbonzini@redhat.com>
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Hi all,

   I run kvm-unit-tests on rhel_7.0, and the apic unittest failed. test.log file showed as follow:

qemu-kvm -enable-kvm -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -kernel x86/apic.flat -smp 2 -cpu qemu64,+x2apic,+tsc-deadline
enabling apic
enabling apic
paging enabled
cr0 = 80010011
cr3 = 7fff000
cr4 = 20
apic version: 1050014
PASS: apic existence
x2apic enabled
FAIL: x2apic enabled to invalid state
FAIL: x2apic enabled to apic enabled
FAIL: disabled to invalid state
FAIL: disabled to x2apic enabled
FAIL: apic enabled to invalid state
PASS: apicbase: relocate apic
FAIL: apicbase: reserved physaddr bits
FAIL: apicbase: reserved low bits
PASS: self ipi
PASS: nmi-after-sti
PASS: multiple nmi
tsc deadline timer not detected

SUMMARY: 12 tests, 7 unexpected failures

   I found that all the tests with "test_for_exception()" failed. After looking at this function, I cannot understand the macro:

   "#define set_exception_jmpbuf(jmpbuf) \
	(setjmp(jmpbuf) ? : (__set_exception_jmpbuf(&(jmpbuf)), 0))"

   So it it always return 0? and what's mean about the statement "(__set_exception_jmpbuf(&(jmpbuf)), 0)"?

   Thanks in advance!

Zhu Yijun