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Re: [Xen-devel] [PATCH 0/5] x86: EPT/MTRR interaction adjustments and cleanup
Jan Beulich wrote:
1: x86/hvm: refine the judgment on IDENT_PT for EMT
2: x86/HVM: fix memory type merging in epte_get_entry_emt()
3: x86/HVM: consolidate passthrough handling in epte_get_entry_emt()
4: x86/HVM: use manifest constants / enumerators for memory types
5: x86/HVM: adjust data definitions in mtrr.c
With this series in place (or actually the first three patches thereof,
as the rest is cleanup), apart from the need to fully drop the
dependency on HVM_PARAM_IDENT_PT (see the discussion started
at http://lists.xenproject.org/archives/html/xen-devel/2014-02/msg02150.html)
the other main question is whether the dependency on iommu_snoop
is really correct: I don't see why the IOMMU's snooping capability
would affect the cachability of memory accesses - especially in the
GPU passthrough case, RAM pages may need mapping as UC/WC
if the GPU is permitted direct access to them - uniformly using WB
here seems to be calling for problems.
Signed-off-by: Jan Beulich<jbeulich@xxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
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