From 3ba731daf09a2dd9515713e2428ef859bb50957b Mon Sep 17 00:00:00 2001 From: James Hogan Date: Tue, 14 Mar 2017 10:25:49 +0000 Subject: [PATCH] KVM: MIPS/VZ: Emulate hit CACHE ops for Octeon III MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: David Daney Cc: Andreas Herrmann Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/kvm/vz.c | 11 +++++++++++ 1 file changed, 11 insertions(+) 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; }; -- 2.20.1