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KVM: MIPS: Add guest exit exception callback

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Add a callback for MIPS KVM implementations to handle the VZ guest
exit exception. Currently the trap & emulate implementation contains a
stub which reports an internal error, but the callback will be used
properly by the VZ implementation.

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: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
This commit is contained in:
James Hogan 2017-03-14 10:15:24 +00:00
parent edab4fe1f6
commit 28c1e762b0
4 changed files with 32 additions and 0 deletions
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1
arch/mips/include/asm/kvm_host.h
View File

@ -542,6 +542,7 @@ struct kvm_mips_callbacks {
int (*handle_msa_fpe)(struct kvm_vcpu *vcpu);
int (*handle_fpe)(struct kvm_vcpu *vcpu);
int (*handle_msa_disabled)(struct kvm_vcpu *vcpu);
int (*handle_guest_exit)(struct kvm_vcpu *vcpu);
int (*hardware_enable)(void);
void (*hardware_disable)(void);
int (*check_extension)(struct kvm *kvm, long ext);

5
arch/mips/kvm/mips.c
View File

@ -1348,6 +1348,11 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
ret = kvm_mips_callbacks->handle_msa_disabled(vcpu);
break;
case EXCCODE_GE:
/* defer exit accounting to handler */
ret = kvm_mips_callbacks->handle_guest_exit(vcpu);
break;
default:
if (cause & CAUSEF_BD)
opc += 1;

2
arch/mips/kvm/trace.h
View File

@ -62,6 +62,7 @@ DEFINE_EVENT(kvm_transition, kvm_out,
#define KVM_TRACE_EXIT_MSA_FPE 14
#define KVM_TRACE_EXIT_FPE 15
#define KVM_TRACE_EXIT_MSA_DISABLED 21
#define KVM_TRACE_EXIT_GUEST_EXIT 27
/* Further exit reasons */
#define KVM_TRACE_EXIT_WAIT 32
#define KVM_TRACE_EXIT_CACHE 33
@ -92,6 +93,7 @@ DEFINE_EVENT(kvm_transition, kvm_out,
{ KVM_TRACE_EXIT_MSA_FPE, "MSA FPE" }, \
{ KVM_TRACE_EXIT_FPE, "FPE" }, \
{ KVM_TRACE_EXIT_MSA_DISABLED, "MSA Disabled" }, \
{ KVM_TRACE_EXIT_GUEST_EXIT, "Guest Exit" }, \
{ KVM_TRACE_EXIT_WAIT, "WAIT" }, \
{ KVM_TRACE_EXIT_CACHE, "CACHE" }, \
{ KVM_TRACE_EXIT_SIGNAL, "Signal" }, \

24
arch/mips/kvm/trap_emul.c
View File

@ -40,6 +40,29 @@ static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva)
return gpa;
}
static int kvm_trap_emul_no_handler(struct kvm_vcpu *vcpu)
{
u32 __user *opc = (u32 __user *) vcpu->arch.pc;
u32 cause = vcpu->arch.host_cp0_cause;
u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
u32 inst = 0;
/*
* Fetch the instruction.
*/
if (cause & CAUSEF_BD)
opc += 1;
kvm_get_badinstr(opc, vcpu, &inst);
kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n",
exccode, opc, inst, badvaddr,
kvm_read_c0_guest_status(vcpu->arch.cop0));
kvm_arch_vcpu_dump_regs(vcpu);
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
@ -1262,6 +1285,7 @@ static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
.handle_msa_fpe = kvm_trap_emul_handle_msa_fpe,
.handle_fpe = kvm_trap_emul_handle_fpe,
.handle_msa_disabled = kvm_trap_emul_handle_msa_disabled,
.handle_guest_exit = kvm_trap_emul_no_handler,
.hardware_enable = kvm_trap_emul_hardware_enable,
.hardware_disable = kvm_trap_emul_hardware_disable,