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authorJames Hogan <james.hogan@imgtec.com>2017-03-14 13:25:49 +0300
committerJames Hogan <james.hogan@imgtec.com>2017-03-28 17:36:19 +0300
commit3ba731daf09a2dd9515713e2428ef859bb50957b (patch)
tree9b1918df19154d34de72f719b17065f50c3194e7 /arch/mips/kvm
parent824533ad169f8bafcafba385a428e5b680928411 (diff)
downloadlinux-3ba731daf09a2dd9515713e2428ef859bb50957b.tar.xz
KVM: MIPS/VZ: Emulate hit CACHE ops for Octeon III
Octeon III doesn't implement the optional GuestCtl0.CG bit to allow guest mode to execute virtual address based CACHE instructions, so implement emulation of a few important ones specifically for Octeon III in response to a GPSI exception. Currently the main reason to perform these operations is for icache synchronisation, so they are implemented as a simple icache flush with local_flush_icache_range(). Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Daney <david.daney@cavium.com> Cc: Andreas Herrmann <andreas.herrmann@caviumnetworks.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
Diffstat (limited to 'arch/mips/kvm')
-rw-r--r--arch/mips/kvm/vz.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
index 21f4495feb15..5c495277bf44 100644
--- a/arch/mips/kvm/vz.c
+++ b/arch/mips/kvm/vz.c
@@ -1105,6 +1105,17 @@ static enum emulation_result kvm_vz_gpsi_cache(union mips_instruction inst,
case Index_Writeback_Inv_D:
flush_dcache_line_indexed(va);
return EMULATE_DONE;
+ case Hit_Invalidate_I:
+ case Hit_Invalidate_D:
+ case Hit_Writeback_Inv_D:
+ if (boot_cpu_type() == CPU_CAVIUM_OCTEON3) {
+ /* We can just flush entire icache */
+ local_flush_icache_range(0, 0);
+ return EMULATE_DONE;
+ }
+
+ /* So far, other platforms support guest hit cache ops */
+ break;
default:
break;
};