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KVM: MIPS/Emulate: Implement 64-bit MMIO emulation

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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 <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
This commit is contained in:
James Hogan 2017-03-14 10:15:16 +00:00
parent 8b48d5b75d
commit 59d7814ab2
1 changed files with 28 additions and 1 deletions
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29
arch/mips/kvm/emulate.c
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@ -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: