| Message ID | 20211201170411.1561936-3-qperret@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: arm64: Introduce kvm_share_hyp() | expand |
On Wed, Dec 01, 2021 at 05:03:56PM +0000, Quentin Perret wrote: > In nVHE protected mode, the EL2 code uses a temporary allocator during > boot while re-creating its stage-1 page-table. Unfortunately, the > hyp_vmmemap is not ready to use at this stage, so refcounting pages > is not possible. That is not currently a problem because hyp stage-1 > mappings are never removed, which implies refcounting of page-table > pages is unnecessary. > > In preparation for allowing hypervisor stage-1 mappings to be removed, > provide stub implementations for {get,put}_page() in the early allocator. > > Signed-off-by: Quentin Perret <qperret@google.com> > --- > arch/arm64/kvm/hyp/nvhe/early_alloc.c | 5 +++++ > 1 file changed, 5 insertions(+) Acked-by: Will Deacon <will@kernel.org> Will
diff --git a/arch/arm64/kvm/hyp/nvhe/early_alloc.c b/arch/arm64/kvm/hyp/nvhe/early_alloc.c index 1306c430ab87..00de04153cc6 100644 --- a/arch/arm64/kvm/hyp/nvhe/early_alloc.c +++ b/arch/arm64/kvm/hyp/nvhe/early_alloc.c @@ -43,6 +43,9 @@ void *hyp_early_alloc_page(void *arg) return hyp_early_alloc_contig(1); } +static void hyp_early_alloc_get_page(void *addr) { } +static void hyp_early_alloc_put_page(void *addr) { } + void hyp_early_alloc_init(void *virt, unsigned long size) { base = cur = (unsigned long)virt; @@ -51,4 +54,6 @@ void hyp_early_alloc_init(void *virt, unsigned long size) hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page; hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt; hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys; + hyp_early_alloc_mm_ops.get_page = hyp_early_alloc_get_page; + hyp_early_alloc_mm_ops.put_page = hyp_early_alloc_put_page; }
In nVHE protected mode, the EL2 code uses a temporary allocator during boot while re-creating its stage-1 page-table. Unfortunately, the hyp_vmmemap is not ready to use at this stage, so refcounting pages is not possible. That is not currently a problem because hyp stage-1 mappings are never removed, which implies refcounting of page-table pages is unnecessary. In preparation for allowing hypervisor stage-1 mappings to be removed, provide stub implementations for {get,put}_page() in the early allocator. Signed-off-by: Quentin Perret <qperret@google.com> --- arch/arm64/kvm/hyp/nvhe/early_alloc.c | 5 +++++ 1 file changed, 5 insertions(+)