From 59d7814ab26f925f209d532ae40f797f20359cec Mon Sep 17 00:00:00 2001 From: James Hogan Date: Tue, 14 Mar 2017 10:15:16 +0000 Subject: [PATCH] KVM: MIPS/Emulate: Implement 64-bit MMIO emulation MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Implement additional MMIO emulation for MIPS64, including 64-bit loads/stores, and 32-bit unsigned loads. These are only exposed on 64-bit VZ hosts. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/kvm/emulate.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index e0f74ee2aad8..d75ab8940e1f 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -1499,6 +1499,17 @@ enum emulation_result kvm_mips_emulate_store(union mips_instruction inst, goto out_fail; switch (inst.i_format.opcode) { +#if defined(CONFIG_64BIT) && defined(CONFIG_KVM_MIPS_VZ) + case sd_op: + run->mmio.len = 8; + *(u64 *)data = vcpu->arch.gprs[rt]; + + kvm_debug("[%#lx] OP_SD: eaddr: %#lx, gpr: %#lx, data: %#llx\n", + vcpu->arch.pc, vcpu->arch.host_cp0_badvaddr, + vcpu->arch.gprs[rt], *(u64 *)data); + break; +#endif + case sw_op: run->mmio.len = 4; *(u32 *)data = vcpu->arch.gprs[rt]; @@ -1575,6 +1586,15 @@ enum emulation_result kvm_mips_emulate_load(union mips_instruction inst, vcpu->mmio_needed = 2; /* signed */ switch (op) { +#if defined(CONFIG_64BIT) && defined(CONFIG_KVM_MIPS_VZ) + case ld_op: + run->mmio.len = 8; + break; + + case lwu_op: + vcpu->mmio_needed = 1; /* unsigned */ + /* fall through */ +#endif case lw_op: run->mmio.len = 4; break; @@ -2421,8 +2441,15 @@ enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, vcpu->arch.pc = vcpu->arch.io_pc; switch (run->mmio.len) { + case 8: + *gpr = *(s64 *)run->mmio.data; + break; + case 4: - *gpr = *(s32 *) run->mmio.data; + if (vcpu->mmio_needed == 2) + *gpr = *(s32 *)run->mmio.data; + else + *gpr = *(u32 *)run->mmio.data; break; case 2: -- 2.20.1