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Re: [Xen-devel] [PATCH v2 1/2] x86/dom0: take alignment into account when populating p2m in PVH mode
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 28 Dec 2018 14:29:24 +0000
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- Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Fri, 28 Dec 2018 14:29:58 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 28/12/2018 11:18, Roger Pau Monne wrote:
> Current code that allocates memory and populates the p2m for PVH Dom0
> doesn't take the address alignment into account, this can lead to high
> order allocations that start on a non-aligned address to be broken
> down into lower order entries on the p2m page tables.
>
> Fix this by taking into account the p2m page sizes and alignment
> requirements when allocating the memory and populating the p2m.
>
> Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Nice. I now get a layout as follows:
(XEN) *** Building a PVH Dom0 ***
(XEN) pvh_populate_memory_range(d0, 0, a0)
(XEN) guest_physmap_add_page(d0, 00000, 100b00, 7 = 512kB)
(XEN) guest_physmap_add_page(d0, 00080, 100bc0, 5 = 128kB)
(XEN) pvh_populate_memory_range(d0, 100, 360)
(XEN) guest_physmap_add_page(d0, 00100, 100a00, 8 = 1024kB)
(XEN) guest_physmap_add_page(d0, 00200, 100800, 9 = 2048kB)
(XEN) guest_physmap_add_page(d0, 00400, 100b80, 6 = 256kB)
(XEN) guest_physmap_add_page(d0, 00440, 1007e0, 5 = 128kB)
which looks to be correct.
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Tested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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