This is the arm64 counterpart of commit cb00a70bd4b7 ("KVM: x86/mmu:
Split huge pages mapped by the TDP MMU during KVM_CLEAR_DIRTY_LOG"),
which has the benefit of splitting the cost of splitting a memslot
across multiple ioctls.
Split huge pages on the range specified using KVM_CLEAR_DIRTY_LOG. And
do not split when enabling dirty logging if KVM_DIRTY_LOG_INITIALLY_SET
is set.
Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
---
arch/arm64/kvm/mmu.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 7881df411643..b8211d833cc1 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1076,8 +1076,8 @@ static void kvm_mmu_split_memory_region(struct kvm *kvm, int slot)
* @mask: The mask of pages at offset 'gfn_offset' in this memory
* slot to enable dirty logging on
*
- * Writes protect selected pages to enable dirty logging for them. Caller must
- * acquire kvm->mmu_lock.
+ * Splits selected pages to PAGE_SIZE and then writes protect them to enable
+ * dirty logging for them. Caller must acquire kvm->mmu_lock.
*/
void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
@@ -1090,6 +1090,14 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
lockdep_assert_held_write(&kvm->mmu_lock);
stage2_wp_range(&kvm->arch.mmu, start, end);
+
+ /*
+ * If initially-all-set mode is not set, then huge-pages were already
+ * split when enabling dirty logging: no need to do it again.
+ */
+ if (kvm_dirty_log_manual_protect_and_init_set(kvm) &&
+ READ_ONCE(eager_page_split))
+ kvm_mmu_split_huge_pages(kvm, start, end);
}
static void kvm_send_hwpoison_signal(unsigned long address, short lsb)
@@ -1474,10 +1482,11 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
*/
if (fault_status == FSC_PERM && vma_pagesize == fault_granule)
ret = kvm_pgtable_stage2_relax_perms(pgt, fault_ipa, prot);
- else
+ else {
ret = kvm_pgtable_stage2_map(pgt, fault_ipa, vma_pagesize,
__pfn_to_phys(pfn), prot,
memcache, KVM_PGTABLE_WALK_SHARED);
+ }
/* Mark the page dirty only if the fault is handled successfully */
if (writable && !ret) {
@@ -1887,7 +1896,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
* this when deleting, moving, disabling dirty logging, or
* creating the memslot (a nop). Doing it for deletes makes
* sure we don't leak memory, and there's no need to keep the
- * cache around for any of the other cases.
+ * cache around for any of the other cases. Keeping the cache
+ * is useful for succesive KVM_CLEAR_DIRTY_LOG calls, which is
+ * not handled in this function.
*/
kvm_mmu_free_memory_cache(&kvm->arch.mmu.split_page_cache);
}
--
2.38.1.431.g37b22c650d-goog
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