From: Avi Kivity <avi@redhat.com>
To: kvm-ia64@vger.kernel.org
Subject: Re: [PATCH] KVM: Qemu: Flush i-cache after ide-dma operation in IA64
Date: Thu, 02 Apr 2009 15:59:32 +0000 [thread overview]
Message-ID: <49D4E0E4.90606@redhat.com> (raw)
In-Reply-To: <10C63FAD690C13458F0B32BCED571F140F98ED4B@pdsmsx502.ccr.corp.intel.com>
Avi Kivity wrote:
>>>
>>
>> It doesn't had to do it. The PCI transaction will automatically
>> invalidate
>> caches - but qemu doesn't emulate this (and doesn't need to do on x86).
>>
>
> So any DMA on ia64 will flush the instruction caches?!
>
Or maybe, the host kernel will do it after the transaction completes?
In our case the lack of zero-copy means the host is invalidating the
wrong addresses (memcpy source) and leaving the real destination intact.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: tgingold@free.fr
Cc: "Zhang, Yang" <yang.zhang@intel.com>,
"kvm-ia64@vger.kernel.org" <kvm-ia64@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Zhang, Xiantao" <xiantao.zhang@intel.com>
Subject: Re: [PATCH] KVM: Qemu: Flush i-cache after ide-dma operation in IA64
Date: Thu, 02 Apr 2009 18:59:32 +0300 [thread overview]
Message-ID: <49D4E0E4.90606@redhat.com> (raw)
In-Reply-To: <49D4DF6A.7080108@redhat.com>
Avi Kivity wrote:
>>>
>>
>> It doesn't had to do it. The PCI transaction will automatically
>> invalidate
>> caches - but qemu doesn't emulate this (and doesn't need to do on x86).
>>
>
> So any DMA on ia64 will flush the instruction caches?!
>
Or maybe, the host kernel will do it after the transaction completes?
In our case the lack of zero-copy means the host is invalidating the
wrong addresses (memcpy source) and leaving the real destination intact.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-04-02 15:59 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-02 2:01 [PATCH] KVM: Qemu: Flush i-cache after ide-dma operation in IA64 Zhang, Yang
2009-04-02 2:01 ` Zhang, Yang
2009-04-02 8:55 ` Avi Kivity
2009-04-02 8:55 ` Avi Kivity
2009-04-02 15:41 ` tgingold
2009-04-02 15:41 ` tgingold
2009-04-02 15:53 ` Avi Kivity
2009-04-02 15:53 ` Avi Kivity
2009-04-02 15:59 ` Avi Kivity [this message]
2009-04-02 15:59 ` Avi Kivity
2009-04-03 1:13 ` Zhang, Xiantao
2009-04-03 1:13 ` Zhang, Xiantao
2009-04-03 1:22 ` Zhang, Xiantao
2009-04-03 1:22 ` Zhang, Xiantao
2009-04-03 1:31 ` Zhang, Xiantao
2009-04-03 1:31 ` Zhang, Xiantao
2009-04-03 11:06 ` Avi Kivity
2009-04-03 11:06 ` Avi Kivity
2009-04-06 16:31 ` [PATCH] KVM: Qemu: Flush i-cache after ide-dma operation in Hollis Blanchard
2009-04-06 16:31 ` [PATCH] KVM: Qemu: Flush i-cache after ide-dma operation in IA64 Hollis Blanchard
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