Commit 6acf5166 authored by Ricardo Koller's avatar Ricardo Koller Committed by Oliver Upton
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KVM: arm64: Split huge pages during KVM_CLEAR_DIRTY_LOG 



This is the arm64 counterpart of commit cb00a70b ("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: default avatarRicardo Koller <ricarkol@google.com>
Reviewed-by: default avatarGavin Shan <gshan@redhat.com>
Link: https://lore.kernel.org/r/20230426172330.1439644-12-ricarkol@google.com


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent 3005f6f2

arch/arm64/kvm/mmu.c

+13 −2
Original line number Diff line number Diff line
@@ -1114,8 +1114,8 @@ 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.

 * Writes protect selected pages to enable dirty logging, and then

 * splits them to PAGE_SIZE. Caller must acquire kvm->mmu_lock.

 */

void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,

		struct kvm_memory_slot *slot,
@@ -1128,6 +1128,17 @@ 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);



	/*

	 * Eager-splitting is done when manual-protect is set.  We

	 * also check for initially-all-set because we can avoid

	 * eager-splitting if initially-all-set is false.

	 * Initially-all-set equal false implies that 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))

		kvm_mmu_split_huge_pages(kvm, start, end);

}



static void kvm_send_hwpoison_signal(unsigned long address, short lsb)