From: Gleb Natapov <gleb@redhat.com>
To: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH 3/8] KVM: fix searching async gfn in kvm_async_pf_gfn_slot
Date: Wed, 27 Oct 2010 12:29:13 +0200 [thread overview]
Message-ID: <20101027102913.GM26191@redhat.com> (raw)
In-Reply-To: <4CC7EAE5.907@cn.fujitsu.com>
On Wed, Oct 27, 2010 at 05:03:33PM +0800, Xiao Guangrong wrote:
> The 'gfn' is not recorded if the next slot is empty
>
This function is not used for gfn recording, only to search for recorded
gfn, but without the fix it walks over all entries if gfn is not in the
hash.
> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
> ---
> arch/x86/kvm/x86.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 7876ec8..16f42ff 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6207,8 +6207,8 @@ static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
> u32 key = kvm_async_pf_hash_fn(gfn);
>
> for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
> - (vcpu->arch.apf.gfns[key] != gfn ||
> - vcpu->arch.apf.gfns[key] == ~0); i++)
> + (vcpu->arch.apf.gfns[key] != gfn &&
> + vcpu->arch.apf.gfns[key] != ~0); i++)
> key = kvm_async_pf_next_probe(key);
>
> return key;
> --
> 1.7.0.4
>
> --
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--
Gleb.
next prev parent reply other threads:[~2010-10-27 10:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-27 9:01 [PATCH 1/8] KVM: fix tracing kvm_try_async_get_page Xiao Guangrong
2010-10-27 9:02 ` [PATCH 2/8] KVM: cleanup aysnc_pf tracepoints Xiao Guangrong
2010-10-27 10:10 ` Gleb Natapov
2010-10-27 9:03 ` [PATCH 3/8] KVM: fix searching async gfn in kvm_async_pf_gfn_slot Xiao Guangrong
2010-10-27 10:29 ` Gleb Natapov [this message]
2010-10-27 9:04 ` [PATCH 4/8] KVM: avoid unnecessary wait for a async pf Xiao Guangrong
2010-10-27 10:42 ` Gleb Natapov
2010-10-28 7:06 ` Xiao Guangrong
2010-10-27 9:05 ` [PATCH 5/8] KVM: don't touch vcpu stat after async pf is complete Xiao Guangrong
2010-10-27 10:44 ` Gleb Natapov
2010-10-28 7:35 ` Xiao Guangrong
2010-10-28 7:41 ` Gleb Natapov
2010-10-27 9:07 ` [PATCH 6/8] KVM: simply wakup async pf Xiao Guangrong
2010-10-27 10:50 ` Gleb Natapov
2010-10-28 7:59 ` Xiao Guangrong
2010-10-27 9:09 ` [PATCH 7/8] KVM: make async_pf work queue lockless Xiao Guangrong
2010-10-27 11:41 ` Gleb Natapov
2010-10-28 9:08 ` Xiao Guangrong
2010-10-28 9:14 ` Gleb Natapov
2010-10-27 9:10 ` [PATCH 8/8] KVM: add debugfs file to show the number of async pf Xiao Guangrong
2010-10-27 10:58 ` Gleb Natapov
2010-10-28 9:09 ` Xiao Guangrong
2010-10-27 9:59 ` [PATCH 1/8] KVM: fix tracing kvm_try_async_get_page Gleb Natapov
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