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[v2,17/33] KVM: MIPS: Add guest exit exception callback

Message ID 78d6139169b127b4c5f38c87494eef6bd20c1616.1489485940.git-series.james.hogan@imgtec.com (mailing list archive)
State New, archived
Headers show

Commit Message

James Hogan March 14, 2017, 10:15 a.m. UTC 
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
---
 arch/mips/include/asm/kvm_host.h |  1 +
 arch/mips/kvm/mips.c             |  5 +++++
 arch/mips/kvm/trace.h            |  2 ++
 arch/mips/kvm/trap_emul.c        | 24 ++++++++++++++++++++++++
 4 files changed, 32 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index acfe7e4e8a3c..32229a1a4a79 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -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);
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 5681117083af..6e91c2416278 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -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;
diff --git a/arch/mips/kvm/trace.h b/arch/mips/kvm/trace.h
index 6e43c89114b8..0c59282a2f7d 100644
--- a/arch/mips/kvm/trace.h
+++ b/arch/mips/kvm/trace.h
@@ -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" },		\
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
index 50b812bfe083..fda45b4bdebc 100644
--- a/arch/mips/kvm/trap_emul.c
+++ b/arch/mips/kvm/trap_emul.c
@@ -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,