diff options
| author |   Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 19:52:14 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 21:09:01 +1100 |
| commit | a3e18ca8ab6f7f2260978f0a3842845414d799c0 (patch) | |
| tree | a87f1b4fb98324206da8621d996148452ce4a697 /arch/powerpc/include/asm/kvm_host.h | |
| parent | KVM: PPC: Book3S HV P9: More SPR speed improvements (diff) | |
| download | linux-dev-a3e18ca8ab6f7f2260978f0a3842845414d799c0.tar.xz linux-dev-a3e18ca8ab6f7f2260978f0a3842845414d799c0.zip | |
KVM: PPC: Book3S HV P9: Demand fault EBB facility registers
Use HFSCR facility disabling to implement demand faulting for EBB, with
a hysteresis counter similar to the load_fp etc counters in context
switching that implement the equivalent demand faulting for userspace
facilities.
This speeds up guest entry/exit by avoiding the register save/restore
when a guest is not frequently using them. When a guest does use them
often, there will be some additional demand fault overhead, but these
are not commonly used facilities.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-37-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/kvm_host.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 21ca15c3bc0b..7a55b19eb6c0 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -579,6 +579,7 @@ struct kvm_vcpu_arch { ulong cfar; ulong ppr; u32 pspb; + u8 load_ebb; ulong fscr; ulong shadow_fscr; ulong ebbhr; |