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Re: [Xen-devel] [PATCH] hvm: live migration between intel and amd
| To: | Jean Guyader <jean.guyader@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] hvm: live migration between intel and amd |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 13 Jun 2008 17:08:23 +0100 |
| Delivery-date: | Fri, 13 Jun 2008 09:07:59 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] hvm: live migration between intel and amd |
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On 13/6/08 16:46, "Jean Guyader" <jean.guyader@xxxxxxxxxxxxx> wrote:
> + /* Do we come from AMD processor ? */
> + if ( data->msr_flags == -1ULL )
> + {
> + data->msr_flags = 0x7ULL;
> +
> + data->ldtr_limit = 0xffffffff;
> + data->ldtr_arbytes = 0xc00;
> +
> + data->cs_arbytes = 0xc9b;
> +
> + data->gs_limit = 0xffffffff;
> + data->gs_arbytes = 0xc00;
> +
> + data->tr_arbytes = 0x8b;
> + }
> +
It's a bit rude to trample register state like this. Why do limits need to
be forced? The Intel manuals do not specify that any vm-entry checks are
applied to segment limits outside of vm86 mode.
-- Keir
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