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KVM: arm64: Add a range to __pkvm_host_share_guest()

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In preparation for supporting stage-2 huge mappings for np-guest. Add a
nr_pages argument to the __pkvm_host_share_guest hypercall. This range
supports only two values: 1 or PMD_SIZE / PAGE_SIZE (that is 512 on a
4K-pages system).

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20250521124834.1070650-4-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Vincent Donnefort
2025-05-21 13:48:27 +01:00
committed by Marc Zyngier
parent 3db771fa23
commit 4274385ebf
4 changed files with 61 additions and 34 deletions
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2
arch/arm64/kvm/pkvm.c
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@@ -366,7 +366,7 @@ int pkvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
return -EINVAL;
lockdep_assert_held_write(&kvm->mmu_lock);
ret = kvm_call_hyp_nvhe(__pkvm_host_share_guest, pfn, gfn, prot);
ret = kvm_call_hyp_nvhe(__pkvm_host_share_guest, pfn, gfn, 1, prot);
if (ret) {
/* Is the gfn already mapped due to a racing vCPU? */
if (ret == -EPERM)