Will Deacon f62d4c3eb6 KVM: arm64: Don't defer TLB invalidation when zapping table entries ... Commit 7657ea920c ("KVM: arm64: Use TLBI range-based instructions for unmap") introduced deferred TLB invalidation for the stage-2 page-table so that range-based invalidation can be used for the accumulated addresses. This works fine if the structure of the page-tables remains unchanged, but if entire tables are zapped and subsequently freed then we transiently leave the hardware page-table walker with a reference to freed memory thanks to the translation walk caches. For example, stage2_unmap_walker() will free page-table pages: if (childp) mm_ops->put_page(childp); and issue the TLB invalidation later in kvm_pgtable_stage2_unmap(): if (stage2_unmap_defer_tlb_flush(pgt)) /* Perform the deferred TLB invalidations */ kvm_tlb_flush_vmid_range(pgt->mmu, addr, size); For now, take the conservative approach and invalidate the TLB eagerly when we clear a table entry. Note, however, that the existing level hint passed to __kvm_tlb_flush_vmid_ipa() is incorrect and will be fixed in a subsequent patch. Cc: Raghavendra Rao Ananta <rananta@google.com> Cc: Shaoqin Huang <shahuang@redhat.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Will Deacon <will@kernel.org> Reviewed-by: Shaoqin Huang <shahuang@redhat.com> Reviewed-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20240327124853.11206-2-will@kernel.org Signed-off-by: Oliver Upton <oliver.upton@linux.dev>		2024-04-01 01:30:45 -07:00
..
boot	USB/Thunderbolt changes for 6.9-rc1	2024-03-21 12:35:20 -07:00
configs	arm64 updates for 6.9:	2024-03-14 15:35:42 -07:00
crypto	This update includes the following changes:	2024-03-15 14:46:54 -07:00
hyperv	x86/hyperv: Use Hyper-V entropy to seed guest random number generator	2024-03-18 22:01:52 +00:00
include	hyperv-next for v6.9	2024-03-21 10:01:02 -07:00
kernel	S390:	2024-03-15 13:03:13 -07:00
kvm	KVM: arm64: Don't defer TLB invalidation when zapping table entries	2024-04-01 01:30:45 -07:00
lib	arm64: Get rid of ARM64_HAS_NO_HW_PREFETCH	2023-12-05 12:02:52 +00:00
mm	- Sumanth Korikkar has taught s390 to allocate hotplug-time page frames	2024-03-14 17:43:30 -07:00
net	arm64, bpf: Use bpf_prog_pack for arm64 bpf trampoline	2024-03-09 08:39:55 -08:00
tools	S390:	2024-03-15 13:03:13 -07:00
xen
Kbuild
Kconfig	arm64 fix/update:	2024-03-21 17:21:41 -07:00
Kconfig.debug
Kconfig.platforms
Makefile	arm64: rust: Enable Rust support for AArch64	2024-02-09 16:12:36 +00:00