KVM: arm64: vgic-debug: Use an xarray mark for debug iterator

The vgic debug iterator is the final user of vgic_copy_lpi_list(), but
is a bit more complicated to transition to something else. Use a mark
in the LPI xarray to record the indices 'known' to the debug iterator.
Protect against the LPIs from being freed by associating an additional
reference with the xarray mark.

Rework iter_next() to let the xarray walk 'drive' the iteration after
visiting all of the SGIs, PPIs, and SPIs.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240422200158.2606761-6-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>

This commit is contained in:

Oliver Upton

2024-04-22 20:01:44 +00:00

committed by

Marc Zyngier

parent 11f4f8f3e6

commit 85d3ccc8b7

4 changed files with 64 additions and 25 deletions

									
										include/kvm/arm_vgic.h
									
		+2
		
												View File
												
				@@ -276,6 +276,8 @@ struct vgic_dist {

					/* Protects the lpi_list. */

					raw_spinlock_t		lpi_list_lock;

				#define LPI_XA_MARK_DEBUG_ITER	XA_MARK_0

					struct xarray		lpi_xa;

					atomic_t		lpi_count;