linux-stable/arch
Sean Christopherson 28cf497881 KVM: x86/mmu: Add lockdep assert to enforce safe usage of kvm_unmap_gfn_range()
Add a lockdep assertion in kvm_unmap_gfn_range() to ensure that either
mmu_invalidate_in_progress is elevated, or that the range is being zapped
due to memslot removal (loosely detected by slots_lock being held).
Zapping SPTEs without mmu_invalidate_{in_progress,seq} protection is unsafe
as KVM's page fault path snapshots state before acquiring mmu_lock, and
thus can create SPTEs with stale information if vCPUs aren't forced to
retry faults (due to seeing an in-progress or past MMU invalidation).

Memslot removal is a special case, as the memslot is retrieved outside of
mmu_invalidate_seq, i.e. doesn't use the "standard" protections, and
instead relies on SRCU synchronization to ensure any in-flight page faults
are fully resolved before zapping SPTEs.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20241009192345.1148353-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-10-20 07:31:05 -04:00
..
alpha asm-generic updates for 6.12 2024-09-26 11:54:40 -07:00
arc Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
arm soc: convert ep93xx to devicetree 2024-09-26 12:00:25 -07:00
arm64 KVM: arm64: Fix kvm_has_feat*() handling of negative features 2024-10-03 19:35:27 +01:00
csky mm: make arch_get_unmapped_area() take vm_flags by default 2024-09-09 16:39:13 -07:00
hexagon hexagon: vdso: Fix build failure 2024-09-23 08:17:50 -07:00
loongarch x86: 2024-09-28 09:20:14 -07:00
m68k m68knommu: updates and fixes for v6.12 2024-09-24 10:48:44 -07:00
microblaze microblaze: don't treat zero reserved memory regions as error 2024-08-25 15:26:30 -07:00
mips x86: 2024-09-28 09:20:14 -07:00
nios2 mm: remove legacy install_special_mapping() code 2024-09-01 20:26:13 -07:00
openrisc openrisc: convert to generic syscall table 2024-07-10 14:23:38 +02:00
parisc [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
powerpc powerpc fixes for 6.12 #2 2024-09-25 11:17:25 -07:00
riscv x86: 2024-09-28 09:20:14 -07:00
s390 x86: 2024-09-28 09:20:14 -07:00
sh sh updates for v6.12 2024-09-27 10:10:21 -07:00
sparc This includes the following changes related to sparc for v6.12: 2024-09-25 11:21:06 -07:00
um This pull request contains the following changes for UML: 2024-09-27 12:48:48 -07:00
x86 KVM: x86/mmu: Add lockdep assert to enforce safe usage of kvm_unmap_gfn_range() 2024-10-20 07:31:05 -04:00
xtensa ALong with the usual shower of singleton patches, notable patch series in 2024-09-21 07:29:05 -07:00
.gitignore
Kconfig Rust changes for v6.12 2024-09-25 10:25:40 -07:00