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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 10:52:16 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 11:09:01 +0100 |
| commit | 5236756d04454c7ce9f45e27b434d75b8d6f8759 (patch) | |
| tree | a08fc79104004a8a6fce3aeba9e823aa31b8a6ea /arch/powerpc/kernel/process.c | |
| parent | KVM: PPC: Book3S HV P9: Demand fault TM facility registers (diff) | |
| download | linux-5236756d04454c7ce9f45e27b434d75b8d6f8759.tar.xz linux-5236756d04454c7ce9f45e27b434d75b8d6f8759.zip | |
KVM: PPC: Book3S HV P9: Use Linux SPR save/restore to manage some host SPRs
Linux implements SPR save/restore including storage space for registers
in the task struct for process context switching. Make use of this
similarly to the way we make use of the context switching fp/vec save
restore.
This improves code reuse, allows some stack space to be saved, and helps
with avoiding VRSAVE updates if they are not required.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-39-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 8f841fbe16ad..5d2333d2a283 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1182,6 +1182,12 @@ void kvmppc_save_user_regs(void) #endif } EXPORT_SYMBOL_GPL(kvmppc_save_user_regs); + +void kvmppc_save_current_sprs(void) +{ + save_sprs(¤t->thread); +} +EXPORT_SYMBOL_GPL(kvmppc_save_current_sprs); #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ static inline void restore_sprs(struct thread_struct *old_thread, |