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RE: [Xen-devel] [PATCH 3/5] vtdt: Modify vlapic code to add vtdt support
| To: | Keir Fraser <keir@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] [PATCH 3/5] vtdt: Modify vlapic code to add vtdt support |
| From: | "Wei, Gang" <gang.wei@xxxxxxxxx> |
| Date: | Tue, 14 Dec 2010 18:13:10 +0800 |
| Accept-language: | zh-CN, en-US |
| Acceptlanguage: | zh-CN, en-US |
| Cc: | "Wei, Gang" <gang.wei@xxxxxxxxx> |
| Delivery-date: | Tue, 14 Dec 2010 02:22:14 -0800 |
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| Thread-topic: | [Xen-devel] [PATCH 3/5] vtdt: Modify vlapic code to add vtdt support |
Keir Fraser wrote on 2010-12-14: >>> Writing any value to LVTT zaps TMICT,TMCCT,MSR_TDT? That seems >>> pretty unlikely to me! This obviously has effects on behaviour >>> outside TDT emulation as it affects TMICT/TMCCT emulation. Looks >>> dangerous, as well as wrong. >> >> It should be better to do the zaps only while the mode bits of LVTT changes. > > What is real hardware behaviour here? I don't see any zappings documented. SDM said "A write to the LVT Timer Register that changes the timer mode disarms the local APIC timer". Jimmy _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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