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linux/arch/powerpc
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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
..
boot USB/Thunderbolt changes for 6.9-rc1 2024-03-21 12:35:20 -07:00
configs powerpc: Add allmodconfig for all 32-bit sub-arches 2024-03-03 22:20:29 +11:00
crypto crypto: vmx - Move to arch/powerpc/crypto 2024-01-26 16:36:57 +08:00
include KVM: delete .change_pte MMU notifier callback 2024-04-11 13:18:27 -04:00
kernel powerpc/kdump: Split KEXEC_CORE and CRASH_DUMP dependency 2024-03-17 13:34:00 +11:00
kexec powerpc/kdump: Split KEXEC_CORE and CRASH_DUMP dependency 2024-03-17 13:34:00 +11:00
kvm KVM: delete .change_pte MMU notifier callback 2024-04-11 13:18:27 -04:00
lib powerpc: xor_vmx: Add '-mhard-float' to CFLAGS 2024-03-07 00:13:28 +11:00
math-emu
mm powerpc: Handle error in mark_rodata_ro() and mark_initmem_nx() 2024-03-17 13:33:21 +11:00
net powerpc/bpf: use bpf_jit_binary_pack_[alloc|finalize|free] 2023-10-23 20:33:19 +11:00
perf powerpc/hv-gpci: Fix the H_GET_PERF_COUNTER_INFO hcall return value checks 2024-03-03 23:05:21 +11:00
platforms powerpc/kdump: Split KEXEC_CORE and CRASH_DUMP dependency 2024-03-17 13:34:00 +11:00
purgatory powerpc/purgatory: remove PGO flags 2023-06-12 11:31:50 -07:00
sysdev powerpc updates for 6.9 2024-03-15 17:53:48 -07:00
tools powerpc/tools: Pass -mabi=elfv2 to gcc-check-mprofile-kernel.sh 2023-10-20 17:46:33 +11:00
xmon powerpc updates for 6.9 2024-03-15 17:53:48 -07:00
Kbuild
Kconfig powerpc/kdump: Split KEXEC_CORE and CRASH_DUMP dependency 2024-03-17 13:34:00 +11:00
Kconfig.debug powerpc/ps3: move udbg_shutdown_ps3gelic prototype 2023-11-21 12:06:50 +11:00
Makefile powerpc updates for 6.9 2024-03-15 17:53:48 -07:00
Makefile.postlink kbuild: remove ARCH_POSTLINK from module builds 2023-10-28 21:10:08 +09:00