Re: [Xen-devel] Ongoing/future speculative mitigation work

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Oct 26, 2018 at 03:16:15AM -0600, Jan Beulich wrote:
> >>> On 25.10.18 at 18:29, <andrew.cooper3@xxxxxxxxxx> wrote:
> > A split xenheap model means that data pertaining to other guests isn't
> > mapped in the context of this vcpu, so cannot be brought into the cache.
> 
> It was not clear to me from Wei's original mail that talk here is
> about "split" in a sense of "per-domain"; I was assuming the
> CONFIG_SEPARATE_XENHEAP mode instead.

The split heap was indeed referring to CONFIG_SEPARATE_XENHEAP mode, yet
I what I wanted most is the partial direct map which reduces the amount
of data mapped inside Xen context -- the original idea was removing
direct map discussed during one of the calls IIRC. I thought making the
partial direct map mode work and make it as small as possible will get
us 90% there.

The "per-domain" heap is a different work item.

Wei.

> 
> Jan
> 
> 

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