The CP0_EBase register is a standard feature of MIPS32r2, so we should
always have been implementing it properly. However the register value
was ignored and wasn't exposed to userland.
Fix the emulation of exceptions and interrupts to use the value stored
in guest CP0_EBase, and fix the masks so that the top 3 bits (rather
than the standard 2) are fixed, so that it is always in the guest KSeg0
segment.
Also add CP0_EBASE to the KVM one_reg interface so it can be accessed by
userland, also allowing the CPU number field to be written (which isn't
permitted by the guest).
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
MIPS | KVM_REG_MIPS_CP0_CAUSE | 32
MIPS | KVM_REG_MIPS_CP0_EPC | 64
MIPS | KVM_REG_MIPS_CP0_PRID | 32
MIPS | KVM_REG_MIPS_CP0_CAUSE | 32
MIPS | KVM_REG_MIPS_CP0_EPC | 64
MIPS | KVM_REG_MIPS_CP0_PRID | 32
+ MIPS | KVM_REG_MIPS_CP0_EBASE | 64
MIPS | KVM_REG_MIPS_CP0_CONFIG | 32
MIPS | KVM_REG_MIPS_CP0_CONFIG1 | 32
MIPS | KVM_REG_MIPS_CP0_CONFIG2 | 32
MIPS | KVM_REG_MIPS_CP0_CONFIG | 32
MIPS | KVM_REG_MIPS_CP0_CONFIG1 | 32
MIPS | KVM_REG_MIPS_CP0_CONFIG2 | 32
#define KVM_GUEST_KUSEG 0x00000000UL
#define KVM_GUEST_KSEG0 0x40000000UL
#define KVM_GUEST_KUSEG 0x00000000UL
#define KVM_GUEST_KSEG0 0x40000000UL
+#define KVM_GUEST_KSEG1 0x40000000UL
#define KVM_GUEST_KSEG23 0x60000000UL
#define KVM_GUEST_KSEGX(a) ((_ACAST32_(a)) & 0xe0000000)
#define KVM_GUEST_CPHYSADDR(a) ((_ACAST32_(a)) & 0x1fffffff)
#define KVM_GUEST_KSEG23 0x60000000UL
#define KVM_GUEST_KSEGX(a) ((_ACAST32_(a)) & 0xe0000000)
#define KVM_GUEST_CPHYSADDR(a) ((_ACAST32_(a)) & 0x1fffffff)
struct kvm_run *run,
struct kvm_vcpu *vcpu);
struct kvm_run *run,
struct kvm_vcpu *vcpu);
+long kvm_mips_guest_exception_base(struct kvm_vcpu *vcpu);
+
extern enum emulation_result kvm_mips_emulate_syscall(u32 cause,
u32 *opc,
struct kvm_run *run,
extern enum emulation_result kvm_mips_emulate_syscall(u32 cause,
u32 *opc,
struct kvm_run *run,
er = EMULATE_FAIL;
break;
}
er = EMULATE_FAIL;
break;
}
-#define C0_EBASE_CORE_MASK 0xff
if ((rd == MIPS_CP0_PRID) && (sel == 1)) {
if ((rd == MIPS_CP0_PRID) && (sel == 1)) {
- /* Preserve CORE number */
- kvm_change_c0_guest_ebase(cop0,
- ~(C0_EBASE_CORE_MASK),
+ /*
+ * Preserve core number, and keep the exception
+ * base in guest KSeg0.
+ */
+ kvm_change_c0_guest_ebase(cop0, 0x1ffff000,
- kvm_err("MTCz, cop0->reg[EBASE]: %#lx\n",
- kvm_read_c0_guest_ebase(cop0));
} else if (rd == MIPS_CP0_TLB_HI && sel == 0) {
u32 nasid =
vcpu->arch.gprs[rt] & KVM_ENTRYHI_ASID;
} else if (rd == MIPS_CP0_TLB_HI && sel == 0) {
u32 nasid =
vcpu->arch.gprs[rt] & KVM_ENTRYHI_ASID;
+/**
+ * kvm_mips_guest_exception_base() - Find guest exception vector base address.
+ *
+ * Returns: The base address of the current guest exception vector, taking
+ * both Guest.CP0_Status.BEV and Guest.CP0_EBase into account.
+ */
+long kvm_mips_guest_exception_base(struct kvm_vcpu *vcpu)
+{
+ struct mips_coproc *cop0 = vcpu->arch.cop0;
+
+ if (kvm_read_c0_guest_status(cop0) & ST0_BEV)
+ return KVM_GUEST_CKSEG1ADDR(0x1fc00200);
+ else
+ return kvm_read_c0_guest_ebase(cop0) & MIPS_EBASE_BASE;
+}
+
enum emulation_result kvm_mips_emulate_syscall(u32 cause,
u32 *opc,
struct kvm_run *run,
enum emulation_result kvm_mips_emulate_syscall(u32 cause,
u32 *opc,
struct kvm_run *run,
(EXCCODE_SYS << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(EXCCODE_SYS << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver SYSCALL when EXL is already set\n");
} else {
kvm_err("Trying to deliver SYSCALL when EXL is already set\n");
arch->pc);
/* set pc to the exception entry point */
arch->pc);
/* set pc to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x0;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x0;
} else {
kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n",
arch->pc);
} else {
kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n",
arch->pc);
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
}
kvm_change_c0_guest_cause(cop0, (0xff),
}
kvm_change_c0_guest_cause(cop0, (0xff),
kvm_debug("[EXL == 0] delivering TLB INV @ pc %#lx\n",
arch->pc);
kvm_debug("[EXL == 0] delivering TLB INV @ pc %#lx\n",
arch->pc);
-
- /* set pc to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
-
} else {
kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n",
arch->pc);
} else {
kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n",
arch->pc);
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ /* set pc to the exception entry point */
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
+
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_TLBL << CAUSEB_EXCCODE));
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_TLBL << CAUSEB_EXCCODE));
arch->pc);
/* Set PC to the exception entry point */
arch->pc);
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x0;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x0;
} else {
kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
} else {
kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
}
kvm_change_c0_guest_cause(cop0, (0xff),
}
kvm_change_c0_guest_cause(cop0, (0xff),
kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
-
- /* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
} else {
kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
} else {
kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ /* Set PC to the exception entry point */
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
+
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_TLBS << CAUSEB_EXCCODE));
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_TLBS << CAUSEB_EXCCODE));
kvm_debug("[EXL == 0] Delivering TLB MOD @ pc %#lx\n",
arch->pc);
kvm_debug("[EXL == 0] Delivering TLB MOD @ pc %#lx\n",
arch->pc);
-
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
} else {
kvm_debug("[EXL == 1] Delivering TLB MOD @ pc %#lx\n",
arch->pc);
} else {
kvm_debug("[EXL == 1] Delivering TLB MOD @ pc %#lx\n",
arch->pc);
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
+
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_MOD << CAUSEB_EXCCODE));
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_MOD << CAUSEB_EXCCODE));
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_CPU << CAUSEB_EXCCODE));
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_CPU << CAUSEB_EXCCODE));
(EXCCODE_RI << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(EXCCODE_RI << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver RI when EXL is already set\n");
} else {
kvm_err("Trying to deliver RI when EXL is already set\n");
(EXCCODE_BP << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(EXCCODE_BP << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver BP when EXL is already set\n");
} else {
kvm_err("Trying to deliver BP when EXL is already set\n");
(EXCCODE_TR << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(EXCCODE_TR << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver TRAP when EXL is already set\n");
} else {
kvm_err("Trying to deliver TRAP when EXL is already set\n");
(EXCCODE_MSAFPE << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(EXCCODE_MSAFPE << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver MSAFPE when EXL is already set\n");
} else {
kvm_err("Trying to deliver MSAFPE when EXL is already set\n");
(EXCCODE_FPE << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(EXCCODE_FPE << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver FPE when EXL is already set\n");
} else {
kvm_err("Trying to deliver FPE when EXL is already set\n");
(EXCCODE_MSADIS << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(EXCCODE_MSADIS << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver MSADIS when EXL is already set\n");
} else {
kvm_err("Trying to deliver MSADIS when EXL is already set\n");
(exccode << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
(exccode << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
kvm_debug("Delivering EXC %d @ pc %#lx, badVaddr: %#lx\n",
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
kvm_debug("Delivering EXC %d @ pc %#lx, badVaddr: %#lx\n",
(exccode << CAUSEB_EXCCODE));
/* XXXSL Set PC to the interrupt exception entry point */
(exccode << CAUSEB_EXCCODE));
/* XXXSL Set PC to the interrupt exception entry point */
+ arch->pc = kvm_mips_guest_exception_base(vcpu);
if (kvm_read_c0_guest_cause(cop0) & CAUSEF_IV)
if (kvm_read_c0_guest_cause(cop0) & CAUSEF_IV)
- arch->pc = KVM_GUEST_KSEG0 + 0x200;
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
clear_bit(priority, &vcpu->arch.pending_exceptions);
}
clear_bit(priority, &vcpu->arch.pending_exceptions);
}
KVM_REG_MIPS_CP0_CAUSE,
KVM_REG_MIPS_CP0_EPC,
KVM_REG_MIPS_CP0_PRID,
KVM_REG_MIPS_CP0_CAUSE,
KVM_REG_MIPS_CP0_EPC,
KVM_REG_MIPS_CP0_PRID,
+ KVM_REG_MIPS_CP0_EBASE,
KVM_REG_MIPS_CP0_CONFIG,
KVM_REG_MIPS_CP0_CONFIG1,
KVM_REG_MIPS_CP0_CONFIG2,
KVM_REG_MIPS_CP0_CONFIG,
KVM_REG_MIPS_CP0_CONFIG1,
KVM_REG_MIPS_CP0_CONFIG2,
case KVM_REG_MIPS_CP0_PRID:
*v = (long)kvm_read_c0_guest_prid(cop0);
break;
case KVM_REG_MIPS_CP0_PRID:
*v = (long)kvm_read_c0_guest_prid(cop0);
break;
+ case KVM_REG_MIPS_CP0_EBASE:
+ *v = (long)kvm_read_c0_guest_ebase(cop0);
+ break;
case KVM_REG_MIPS_CP0_CONFIG:
*v = (long)kvm_read_c0_guest_config(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG:
*v = (long)kvm_read_c0_guest_config(cop0);
break;
case KVM_REG_MIPS_CP0_PRID:
kvm_write_c0_guest_prid(cop0, v);
break;
case KVM_REG_MIPS_CP0_PRID:
kvm_write_c0_guest_prid(cop0, v);
break;
+ case KVM_REG_MIPS_CP0_EBASE:
+ /*
+ * Allow core number to be written, but the exception base must
+ * remain in guest KSeg0.
+ */
+ kvm_change_c0_guest_ebase(cop0, 0x1ffff000 | MIPS_EBASE_CPUNUM,
+ v);
+ break;
case KVM_REG_MIPS_CP0_COUNT:
kvm_mips_write_count(vcpu, v);
break;
case KVM_REG_MIPS_CP0_COUNT:
kvm_mips_write_count(vcpu, v);
break;