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| author | Quentin Perret <qperret@google.com> | 2022-11-10 22:02:36 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-11 19:40:54 +0300 |
| commit | 8e6bcc3a4502a0d8d065466efd888b6b59b85789 (patch) | |
| tree | e2cc18b18e35df3b6616e5d9479ff4018f997bcc /arch/arm64/kvm/hyp/nvhe/page_alloc.c | |
| parent | 72a5bc0f153ce8ca80e9abbd1d9adec7d586915a (diff) | |
| download | linux-8e6bcc3a4502a0d8d065466efd888b6b59b85789.tar.xz | |
KVM: arm64: Back the hypervisor 'struct hyp_page' array for all memory
The EL2 'vmemmap' array in nVHE Protected mode is currently very sparse:
only memory pages owned by the hypervisor itself have a matching 'struct
hyp_page'. However, as the size of this struct has been reduced
significantly since its introduction, it appears that we can now afford
to back the vmemmap for all of memory.
Having an easily accessible 'struct hyp_page' for every physical page in
memory provides the hypervisor with a simple mechanism to store metadata
(e.g. a refcount) that wouldn't otherwise fit in the very limited number
of software bits available in the host stage-2 page-table entries. This
will be used in subsequent patches when pinning host memory pages for
use by the hypervisor at EL2.
Tested-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221110190259.26861-4-will@kernel.org
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/page_alloc.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/page_alloc.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c index dad88e203598..803ba3222e75 100644 --- a/arch/arm64/kvm/hyp/nvhe/page_alloc.c +++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c @@ -236,10 +236,8 @@ int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages, /* Init the vmemmap portion */ p = hyp_phys_to_page(phys); - for (i = 0; i < nr_pages; i++) { - p[i].order = 0; + for (i = 0; i < nr_pages; i++) hyp_set_page_refcounted(&p[i]); - } /* Attach the unused pages to the buddy tree */ for (i = reserved_pages; i < nr_pages; i++) |