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linux-stable/virt/kvm
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Paolo Bonzini f3b65bbaed KVM: delete .change_pte MMU notifier callback 
The .change_pte() MMU notifier callback was intended as an
optimization. The original point of it was that KSM could tell KVM to flip
its secondary PTE to a new location without having to first zap it. At
the time there was also an .invalidate_page() callback; both of them were
*not* bracketed by calls to mmu_notifier_invalidate_range_{start,end}(),
and .invalidate_page() also doubled as a fallback implementation of
.change_pte().

Later on, however, both callbacks were changed to occur within an
invalidate_range_start/end() block.

In the case of .change_pte(), commit 6bdb913f0a ("mm: wrap calls to
set_pte_at_notify with invalidate_range_start and invalidate_range_end",
2012-10-09) did so to remove the fallback from .invalidate_page() to
.change_pte() and allow sleepable .invalidate_page() hooks.

This however made KVM's usage of the .change_pte() callback completely
moot, because KVM unmaps the sPTEs during .invalidate_range_start()
and therefore .change_pte() has no hope of finding a sPTE to change.
Drop the generic KVM code that dispatches to kvm_set_spte_gfn(), as
well as all the architecture specific implementations.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Anup Patel <anup@brainfault.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-ID: <20240405115815.3226315-2-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-04-11 13:18:27 -04:00
..
async_pf.c KVM: Nullify async #PF worker's "apf" pointer as soon as it might be freed 2024-02-06 11:04:58 -08:00
async_pf.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 504 2019-06-19 17:09:56 +02:00
binary_stats.c KVM: stats: remove dead stores 2021-08-13 03:35:15 -04:00
coalesced_mmio.c KVM: destruct kvm_io_device while unregistering it from kvm_io_bus 2023-06-13 14:18:09 -07:00
coalesced_mmio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dirty_ring.c KVM: Allow arch code to track number of memslot address spaces per VM 2023-11-14 08:01:05 -05:00
eventfd.c Generic: 2024-01-17 13:03:37 -08:00
guest_memfd.c Generic: 2024-01-17 13:03:37 -08:00
irqchip.c KVM: replace direct irq.h inclusion 2022-11-09 12:31:37 -05:00
Kconfig Merge branch 'kvm-kconfig' 2024-02-08 08:47:51 -05:00
kvm_main.c KVM: delete .change_pte MMU notifier callback 2024-04-11 13:18:27 -04:00
kvm_mm.h KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory 2023-11-14 08:01:03 -05:00
Makefile.kvm KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory 2023-11-14 08:01:03 -05:00
pfncache.c KVM: pfncache: simplify locking and make more self-contained 2024-03-04 16:22:38 -08:00
vfio.c kvm/vfio: avoid bouncing the mutex when adding and deleting groups 2023-08-03 12:01:56 -06:00
vfio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00