From: Keir Fraser <keir.fraser@eu.citrix.com>
To: "Xu, Dongxiao" <dongxiao.xu@intel.com>,
"Cui, Dexuan" <dexuan.cui@intel.com>,
xen-devel@lists.xensource.com
Subject: Re: [PATCH]Fix the bug of guest os installationfailure and win2k boot failure
Date: Tue, 18 Mar 2008 16:32:21 +0000 [thread overview]
Message-ID: <C4059F15.1E0DF%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <C40543C0.1E069%keir.fraser@eu.citrix.com>
On 18/3/08 10:02, "Keir Fraser" <keir.fraser@eu.citrix.com> wrote:
>> In your last sentence, do you mean that we still
>> need to do an entire I/O permission check (including CPL, IOPL, and TSS I/O
>> bitmap) in x86_emulate() for safety consideration? Thanks! :-)
>
> Yes. Like I said: the CPL-IOPL check is very cheap, the TSS bitmap check is a
> little more expensive but probably relatively rare. And in any case the I/O
> port access latency is largely dominated by the VMEXIT/VMENTRY times. Also the
> devices we emulate are mostly managed by mmio.
I'll cook up a patch for this myself, by the way.
-- Keir
prev parent reply other threads:[~2008-03-18 16:32 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-17 8:08 [PATCH]Fix the bug of guest os installation failure and win2k boot failure Xu, Dongxiao
2008-03-17 8:32 ` Keir Fraser
2008-03-17 10:06 ` Xu, Dongxiao
2008-03-17 10:32 ` Keir Fraser
2008-03-17 11:16 ` [PATCH]Fix the bug of guest os installationfailure " Cui, Dexuan
2008-03-17 11:20 ` Keir Fraser
2008-03-18 1:49 ` Xu, Dongxiao
2008-03-18 8:46 ` Keir Fraser
2008-03-18 9:35 ` Xu, Dongxiao
2008-03-18 10:02 ` Keir Fraser
2008-03-18 10:31 ` Xu, Dongxiao
2008-03-18 10:47 ` Keir Fraser
2008-03-18 16:32 ` Keir Fraser [this message]
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