Hi Marc,
On 10/29/22 7:29 PM, Marc Zyngier wrote:
On Wed, 26 Oct 2022 01:29:56 +0100,
Gavin Shan <gs...@redhat.com> wrote:
On 10/24/22 11:54 AM, Gavin Shan wrote:
There are three high memory regions, which are VIRT_HIGH_REDIST2,
VIRT_HIGH_PCIE_ECAM and VIRT_HIGH_PCIE_MMIO. Their base addresses
are floating on highest RAM address. However, they can be disabled
in several cases.
(1) One specific high memory region is disabled by developer by
toggling vms->highmem_{redists, ecam, mmio}.
(2) VIRT_HIGH_PCIE_ECAM region is disabled on machine, which is
'virt-2.12' or ealier than it.
(3) VIRT_HIGH_PCIE_ECAM region is disabled when firmware is loaded
on 32-bits system.
(4) One specific high memory region is disabled when it breaks the
PA space limit.
The current implementation of virt_set_memmap() isn't comprehensive
because the space for one specific high memory region is always
reserved from the PA space for case (1), (2) and (3). In the code,
'base' and 'vms->highest_gpa' are always increased for those three
cases. It's unnecessary since the assigned space of the disabled
high memory region won't be used afterwards.
The series intends to improve the address assignment for these
high memory regions and introduces new properties for user to
selectively disable those 3 high memory regions.
PATCH[1-4] preparatory work for the improvment
PATCH[5] improve high memory region address assignment
PATCH[6] adds 'compact-highmem' to enable or disable the optimization
PATCH[7] adds properties so that high memory regions can be disabled
v5: https://lists.nongnu.org/archive/html/qemu-arm/2022-10/msg00280.html
v4: https://lists.nongnu.org/archive/html/qemu-arm/2022-10/msg00067.html
v3: https://lists.nongnu.org/archive/html/qemu-arm/2022-09/msg00258.html
v2: https://lore.kernel.org/all/20220815062958.100366-1-gs...@redhat.com/T/
v1: https://lists.nongnu.org/archive/html/qemu-arm/2022-08/msg00013.html
Could you help to take a look when getting a chance? I think Connie and
Eric are close to complete the reviews, but v7 is still needed to address
extra comments from them. I hope to make v7 mergeable if possible :)
With the comments from Connie and Eric addressed, this looks good to
me:
Reviewed-by: Marc Zyngier <m...@kernel.org>
Thanks for having gone the extra mile on this one.
Thank you for your feedback and reviews. I've posted v7 with your r-b
after resolving comments from Connie/Eric.
https://lists.nongnu.org/archive/html/qemu-arm/2022-10/msg00693.html (v7)
Thanks,
Gavin
