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| author | James Hogan <james.hogan@imgtec.com> | 2017-03-14 10:15:33 +0000 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2017-03-28 14:53:55 +0100 |
| commit | edc89260d474fd044e77b7039bd2a697dddcac6c (patch) | |
| tree | 52b87d2e49bb8677def407489f3586d34e12abe7 /arch/mips/kvm | |
| parent | 56f7a4405047353684e0d083d7426594daa5e344 (diff) | |
| download | linux-stable-edc89260d474fd044e77b7039bd2a697dddcac6c.tar.gz linux-stable-edc89260d474fd044e77b7039bd2a697dddcac6c.tar.bz2 linux-stable-edc89260d474fd044e77b7039bd2a697dddcac6c.zip | |
KVM: MIPS/VZ: Support guest CP0_BadInstr[P]
Add support for VZ guest CP0_BadInstr and CP0_BadInstrP registers, as
found on most VZ capable cores. These guest registers need context
switching, and exposing via the KVM ioctl API when they are present.
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: Jonathan Corbet <corbet@lwn.net>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Diffstat (limited to 'arch/mips/kvm')
| -rw-r--r-- | arch/mips/kvm/vz.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index cfed234be1e3..ec909fcd08ce 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -1221,6 +1221,10 @@ static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu) ret = ARRAY_SIZE(kvm_vz_get_one_regs); if (cpu_guest_has_userlocal) ++ret; + if (cpu_guest_has_badinstr) + ++ret; + if (cpu_guest_has_badinstrp) + ++ret; ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask); return ret; @@ -1242,6 +1246,18 @@ static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices) return -EFAULT; ++indices; } + if (cpu_guest_has_badinstr) { + index = KVM_REG_MIPS_CP0_BADINSTR; + if (copy_to_user(indices, &index, sizeof(index))) + return -EFAULT; + ++indices; + } + if (cpu_guest_has_badinstrp) { + index = KVM_REG_MIPS_CP0_BADINSTRP; + if (copy_to_user(indices, &index, sizeof(index))) + return -EFAULT; + ++indices; + } for (i = 0; i < 6; ++i) { if (!cpu_guest_has_kscr(i + 2)) continue; @@ -1327,6 +1343,16 @@ static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_BADVADDR: *v = (long)read_gc0_badvaddr(); break; + case KVM_REG_MIPS_CP0_BADINSTR: + if (!cpu_guest_has_badinstr) + return -EINVAL; + *v = read_gc0_badinstr(); + break; + case KVM_REG_MIPS_CP0_BADINSTRP: + if (!cpu_guest_has_badinstrp) + return -EINVAL; + *v = read_gc0_badinstrp(); + break; case KVM_REG_MIPS_CP0_COUNT: *v = kvm_mips_read_count(vcpu); break; @@ -1472,6 +1498,16 @@ static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_BADVADDR: write_gc0_badvaddr(v); break; + case KVM_REG_MIPS_CP0_BADINSTR: + if (!cpu_guest_has_badinstr) + return -EINVAL; + write_gc0_badinstr(v); + break; + case KVM_REG_MIPS_CP0_BADINSTRP: + if (!cpu_guest_has_badinstrp) + return -EINVAL; + write_gc0_badinstrp(v); + break; case KVM_REG_MIPS_CP0_COUNT: kvm_mips_write_count(vcpu, v); break; @@ -1871,6 +1907,11 @@ static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_restore_gc0_kscratch6(cop0); } + if (cpu_guest_has_badinstr) + kvm_restore_gc0_badinstr(cop0); + if (cpu_guest_has_badinstrp) + kvm_restore_gc0_badinstrp(cop0); + /* restore Root.GuestCtl2 from unused Guest guestctl2 register */ if (cpu_has_guestctl2) write_c0_guestctl2( @@ -1945,6 +1986,11 @@ static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu) kvm_save_gc0_kscratch6(cop0); } + if (cpu_guest_has_badinstr) + kvm_save_gc0_badinstr(cop0); + if (cpu_guest_has_badinstrp) + kvm_save_gc0_badinstrp(cop0); + kvm_vz_save_timer(vcpu); /* save Root.GuestCtl2 in unused Guest guestctl2 register */ |