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Message-ID: <4D37A603.4040602@cn.fujitsu.com>
Date: Thu, 20 Jan 2011 11:03:31 +0800
From: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To: Marcelo Tosatti <mtosatti@...hat.com>
CC: Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] KVM: fix rcu usage warning in kvm_arch_vcpu_ioctl_set_sregs()
On 01/20/2011 02:13 AM, Marcelo Tosatti wrote:
> On Wed, Jan 19, 2011 at 01:16:23PM +0800, Xiao Guangrong wrote:
>> On 01/12/2011 03:39 PM, Xiao Guangrong wrote:
>>> Fix:
>>>
>>> [ 1001.499596] ===================================================
>>> [ 1001.499599] [ INFO: suspicious rcu_dereference_check() usage. ]
>>> [ 1001.499601] ---------------------------------------------------
>>> [ 1001.499604] include/linux/kvm_host.h:301 invoked rcu_dereference_check() without protection!
>>> ......
>>> [ 1001.499636] Pid: 6035, comm: qemu-system-x86 Not tainted 2.6.37-rc6+ #62
>>> [ 1001.499638] Call Trace:
>>> [ 1001.499644] [] lockdep_rcu_dereference+0x9d/0xa5
>>> [ 1001.499653] [] gfn_to_memslot+0x8d/0xc8 [kvm]
>>> [ 1001.499661] [] gfn_to_hva+0x16/0x3f [kvm]
>>> [ 1001.499669] [] kvm_read_guest_page+0x1e/0x5e [kvm]
>>> [ 1001.499681] [] kvm_read_guest_page_mmu+0x53/0x5e [kvm]
>>> [ 1001.499699] [] load_pdptrs+0x3f/0x9c [kvm]
>>> [ 1001.499705] [] ? vmx_set_cr0+0x507/0x517 [kvm_intel]
>>> [ 1001.499717] [] kvm_arch_vcpu_ioctl_set_sregs+0x1f3/0x3c0 [kvm]
>>> [ 1001.499727] [] kvm_vcpu_ioctl+0x6a5/0xbc5 [kvm]
>>>
>>> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
>>
>> Ping ...?
>
> Applied this fix. For the make_all_cpus_request optimization, can you
> show numbers with this new version? Because now there is LOCK# similarly
> to the spinlock.
Marcelo,
Sure :-), there is the simply test result of kernbench:
Before patch:
real 5m6.493s
user 3m57.847s
sys 9m7.115s
real 5m1.750s
user 4m0.109s
sys 9m10.192s
After patch:
real 5m0.140s
user 3m57.956s
sys 8m58.339s
real 4m56.314s
user 4m0.303s
sys 8m55.774s
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