summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--Documentation/virtual/kvm/api.txt1
-rw-r--r--arch/mips/include/asm/kvm_host.h3
-rw-r--r--arch/mips/kvm/emulate.c73
-rw-r--r--arch/mips/kvm/interrupt.c5
-rw-r--r--arch/mips/kvm/trap_emul.c12
5 files changed, 61 insertions, 33 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 03145b7cafaa..8d52d0f990ae 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2074,6 +2074,7 @@ registers, find a list below:
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
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index bc56a312497d..420372fa5bbc 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -88,6 +88,7 @@
#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)
@@ -713,6 +714,8 @@ extern enum emulation_result kvm_mips_emulate_inst(u32 cause,
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,
diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
index f2b054b80bca..d40cfaad4529 100644
--- a/arch/mips/kvm/emulate.c
+++ b/arch/mips/kvm/emulate.c
@@ -1200,14 +1200,13 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst,
er = EMULATE_FAIL;
break;
}
-#define C0_EBASE_CORE_MASK 0xff
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,
vcpu->arch.gprs[rt]);
- 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;
@@ -1917,6 +1916,22 @@ unknown:
return er;
}
+/**
+ * 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,
@@ -1942,7 +1957,7 @@ enum emulation_result kvm_mips_emulate_syscall(u32 cause,
(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");
@@ -1976,13 +1991,13 @@ enum emulation_result kvm_mips_emulate_tlbmiss_ld(u32 cause,
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);
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
}
kvm_change_c0_guest_cause(cop0, (0xff),
@@ -2019,16 +2034,14 @@ enum emulation_result kvm_mips_emulate_tlbinv_ld(u32 cause,
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);
- 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));
@@ -2064,11 +2077,11 @@ enum emulation_result kvm_mips_emulate_tlbmiss_st(u32 cause,
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);
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
}
kvm_change_c0_guest_cause(cop0, (0xff),
@@ -2104,15 +2117,14 @@ enum emulation_result kvm_mips_emulate_tlbinv_st(u32 cause,
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);
- 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));
@@ -2146,14 +2158,13 @@ enum emulation_result kvm_mips_emulate_tlbmod(u32 cause,
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);
- 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));
@@ -2185,7 +2196,7 @@ enum emulation_result kvm_mips_emulate_fpu_exc(u32 cause,
}
- 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));
@@ -2219,7 +2230,7 @@ enum emulation_result kvm_mips_emulate_ri_exc(u32 cause,
(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");
@@ -2254,7 +2265,7 @@ enum emulation_result kvm_mips_emulate_bp_exc(u32 cause,
(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");
@@ -2289,7 +2300,7 @@ enum emulation_result kvm_mips_emulate_trap_exc(u32 cause,
(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");
@@ -2324,7 +2335,7 @@ enum emulation_result kvm_mips_emulate_msafpe_exc(u32 cause,
(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");
@@ -2359,7 +2370,7 @@ enum emulation_result kvm_mips_emulate_fpe_exc(u32 cause,
(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");
@@ -2394,7 +2405,7 @@ enum emulation_result kvm_mips_emulate_msadis_exc(u32 cause,
(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");
@@ -2560,7 +2571,7 @@ static enum emulation_result kvm_mips_emulate_exc(u32 cause,
(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",
diff --git a/arch/mips/kvm/interrupt.c b/arch/mips/kvm/interrupt.c
index e88403b3dcdd..aa0a1a00faf6 100644
--- a/arch/mips/kvm/interrupt.c
+++ b/arch/mips/kvm/interrupt.c
@@ -183,10 +183,11 @@ int kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority,
(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)
- arch->pc = KVM_GUEST_KSEG0 + 0x200;
+ arch->pc += 0x200;
else
- arch->pc = KVM_GUEST_KSEG0 + 0x180;
+ arch->pc += 0x180;
clear_bit(priority, &vcpu->arch.pending_exceptions);
}
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
index 08327de4323a..80a681f42bf5 100644
--- a/arch/mips/kvm/trap_emul.c
+++ b/arch/mips/kvm/trap_emul.c
@@ -653,6 +653,7 @@ static u64 kvm_trap_emul_get_one_regs[] = {
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,
@@ -735,6 +736,9 @@ static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu,
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;
@@ -837,6 +841,14 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu,
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;
generated by cgit (git 2.34.1) at 2024-05-23 05:44:11 +0000