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xen-devel
RE: [Xen-devel] tsc_mode == 1 and hvm guests
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To: |
"Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx> |
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Subject: |
RE: [Xen-devel] tsc_mode == 1 and hvm guests |
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From: |
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> |
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Date: |
Mon, 10 May 2010 13:48:15 +0100 |
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Cc: |
Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx> |
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Mon, 10 May 2010 05:46:30 -0700 |
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<alpine.DEB.2.00.1005061225520.11380@kaball-desktop C8086EE8.13654%keir.fraser@xxxxxxxxxxxxx> <83525af4-089d-41ab-aa54-18d1581cae46@default> <BC00F5384FCFC9499AF06F92E8B78A9E049BB20B87@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <alpine.DEB.2.00.1005071857010.11380@kaball-desktop> <BC00F5384FCFC9499AF06F92E8B78A9E049BB20E05@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
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Alpine 2.00 (DEB 1167 2008-08-23) |
On Sun, 9 May 2010, Zhang, Xiantao wrote:
> How to handle the VM migration which occurs bettwen two different TSC
> frequency machines ?
> Xiantao
if the destination machine has a different tsc rate than vtsc is set to
1, rdtsc starts to be trapped if it wasn't before and in
hvm_get_guest_tsc we scale the the guest time using ns_to_vtsc before
returning to the user.
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