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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 12:52:27 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 13:09:02 +0300 |
| commit | 434398ab5eed03dbc0075af9436e871712bfb45a (patch) | |
| tree | e671f853504096d3aeee40c0244bcc42f1af9329 /arch/powerpc/include/asm/kvm_book3s_64.h | |
| parent | 4c9a68914eab1f17f6c428c579ffd75c4448461e (diff) | |
| download | linux-434398ab5eed03dbc0075af9436e871712bfb45a.tar.xz | |
KVM: PPC: Book3S HV P9: Avoid cpu_in_guest atomics on entry and exit
cpu_in_guest is set to determine if a CPU needs to be IPI'ed to exit
the guest and notice the need_tlb_flush bit.
This can be implemented as a global per-CPU pointer to the currently
running guest instead of per-guest cpumasks, saving 2 atomics per
entry/exit. P7/8 doesn't require cpu_in_guest, nor does a nested HV
(only the L0 does), so move it to the P9 HV path.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-50-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/kvm_book3s_64.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_book3s_64.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 96f0fda50a07..fe07558173ef 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -44,7 +44,6 @@ struct kvm_nested_guest { struct mutex tlb_lock; /* serialize page faults and tlbies */ struct kvm_nested_guest *next; cpumask_t need_tlb_flush; - cpumask_t cpu_in_guest; short prev_cpu[NR_CPUS]; u8 radix; /* is this nested guest radix */ }; |