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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 12:51:47 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 13:08:57 +0300 |
| commit | 46f9caf1a246a5c0622fa8cc7e673658e925f97e (patch) | |
| tree | 588a28905c70adcd36e135af702a8e4293b20288 /arch/powerpc/kvm/book3s_hv_rmhandlers.S | |
| parent | eacc818864bb01828280f4d64334c4e5ae6a4daf (diff) | |
| download | linux-46f9caf1a246a5c0622fa8cc7e673658e925f97e.tar.xz | |
powerpc/64s: Keep AMOR SPR a constant ~0 at runtime
This register controls supervisor SPR modifications, and as such is only
relevant for KVM. KVM always sets AMOR to ~0 on guest entry, and never
restores it coming back out to the host, so it can be kept constant and
avoid the mtSPR in KVM guest entry.
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/20211123095231.1036501-10-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rmhandlers.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 32a4b4d412b9..c45ec4cd9d52 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -778,10 +778,8 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) /* Restore AMR and UAMOR, set AMOR to all 1s */ ld r5,VCPU_AMR(r4) ld r6,VCPU_UAMOR(r4) - li r7,-1 mtspr SPRN_AMR,r5 mtspr SPRN_UAMOR,r6 - mtspr SPRN_AMOR,r7 /* Restore state of CTRL run bit; assume 1 on entry */ lwz r5,VCPU_CTRL(r4) |