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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-05-28 19:07:50 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-10 22:12:15 +1000 |
| commit | 079a09a500c399f804effcf9bb49214cdfa698e5 (patch) | |
| tree | 33bc987d0937d93d98f56733084e2a1fce5081c0 /arch/powerpc/include | |
| parent | ac3c8b41c27ea112daed031f852a4b361c11a03e (diff) | |
| download | linux-079a09a500c399f804effcf9bb49214cdfa698e5.tar.gz linux-079a09a500c399f804effcf9bb49214cdfa698e5.tar.bz2 linux-079a09a500c399f804effcf9bb49214cdfa698e5.zip | |
KVM: PPC: Book3S HV P9: implement hash guest support
Implement hash guest support. Guest entry/exit has to restore and
save/clear the SLB, plus several other bits to accommodate hash guests
in the P9 path. Radix host, hash guest support is removed from the P7/8
path.
The HPT hcalls and faults are not handled in real mode, which is a
performance regression. A worst-case fork/exit microbenchmark takes 3x
longer after this patch. kbuild benchmark performance is in the noise,
but the slowdown is likely to be noticed somewhere.
For now, accept this penalty for the benefit of simplifying the P7/8
paths and unifying P9 hash with the new code, because hash is a less
important configuration than radix on processors that support it. Hash
will benefit from future optimisations to this path, including possibly
a faster path to handle such hcalls and interrupts without doing a full
exit.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-31-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_asm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/kvm_asm.h b/arch/powerpc/include/asm/kvm_asm.h index f4ae37810aa9..e479487488f4 100644 --- a/arch/powerpc/include/asm/kvm_asm.h +++ b/arch/powerpc/include/asm/kvm_asm.h @@ -147,7 +147,7 @@ #define KVM_GUEST_MODE_SKIP 2 #define KVM_GUEST_MODE_GUEST_HV 3 #define KVM_GUEST_MODE_HOST_HV 4 -#define KVM_GUEST_MODE_HV_FAST 5 /* ISA >= v3.0 host+guest radix */ +#define KVM_GUEST_MODE_HV_FAST 5 /* ISA >= v3.0 host radix */ #define KVM_INST_FETCH_FAILED -1 |