| Message ID | 1500397144-16232-22-git-send-email-jintack.lim@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Nested Virtualization on KVM/ARM | expand |
On Tue, Jul 18, 2017 at 11:58:47AM -0500, Jintack Lim wrote: > When HCR.NV bit is set, execution of the EL2 translation regime address > aranslation instructions and TLB maintenance instructions are trapped to translation > EL2. In addition, execution of the EL1 translation regime address > aranslation instructions and TLB maintenance instructions that are only translation > accessible from EL2 and above are trapped to EL2. In these cases, > ESR_EL2.EC will be set to 0x18. > > Change the existing handler to handle those system instructions as well > as MRS/MSR instructions. Emulation of each system instructions will be > done in separate patches. > > Signed-off-by: Jintack Lim <jintack.lim@linaro.org> > --- > arch/arm64/include/asm/kvm_coproc.h | 2 +- > arch/arm64/kvm/handle_exit.c | 2 +- > arch/arm64/kvm/sys_regs.c | 53 ++++++++++++++++++++++++++++++++----- > arch/arm64/kvm/trace.h | 2 +- > 4 files changed, 50 insertions(+), 9 deletions(-) > > diff --git a/arch/arm64/include/asm/kvm_coproc.h b/arch/arm64/include/asm/kvm_coproc.h > index 0b52377..1b3d21b 100644 > --- a/arch/arm64/include/asm/kvm_coproc.h > +++ b/arch/arm64/include/asm/kvm_coproc.h > @@ -43,7 +43,7 @@ void kvm_register_target_sys_reg_table(unsigned int target, > int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run); > int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run); > int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run); > -int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run); > +int kvm_handle_sys(struct kvm_vcpu *vcpu, struct kvm_run *run); > > #define kvm_coproc_table_init kvm_sys_reg_table_init > void kvm_sys_reg_table_init(void); > diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c > index 9259881..d19e253 100644 > --- a/arch/arm64/kvm/handle_exit.c > +++ b/arch/arm64/kvm/handle_exit.c > @@ -174,7 +174,7 @@ static int kvm_handle_eret(struct kvm_vcpu *vcpu, struct kvm_run *run) > [ESR_ELx_EC_SMC32] = handle_smc, > [ESR_ELx_EC_HVC64] = handle_hvc, > [ESR_ELx_EC_SMC64] = handle_smc, > - [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, > + [ESR_ELx_EC_SYS64] = kvm_handle_sys, > [ESR_ELx_EC_ERET] = kvm_handle_eret, > [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, > [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort, > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index 7062645..dbf5022 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -1808,6 +1808,40 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu, > return 1; > } > > +static int emulate_tlbi(struct kvm_vcpu *vcpu, > + struct sys_reg_params *params) > +{ > + /* TODO: support tlbi instruction emulation*/ > + kvm_inject_undefined(vcpu); > + return 1; > +} > + > +static int emulate_at(struct kvm_vcpu *vcpu, > + struct sys_reg_params *params) > +{ > + /* TODO: support address translation instruction emulation */ > + kvm_inject_undefined(vcpu); > + return 1; > +} > + > +static int emulate_sys_instr(struct kvm_vcpu *vcpu, > + struct sys_reg_params *params) > +{ > + int ret = 0; > + > + /* TLB maintenance instructions*/ > + if (params->CRn == 0b1000) > + ret = emulate_tlbi(vcpu, params); > + /* Address Translation instructions */ > + else if (params->CRn == 0b0111 && params->CRm == 0b1000) > + ret = emulate_at(vcpu, params); there are some style issues here. I think it would be nicer to do: if (x) { /* Foo */ do_something(); } else if (y) { /* Bar */ do_something_else(); } can you remind me why we'd not see any other than these particular two classes of instructions here? > + > + if (ret) > + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); > + > + return ret; > +} > + > static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, > const struct sys_reg_desc *table, size_t num) > { > @@ -1819,18 +1853,19 @@ static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, > } > > /** > - * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access > + * kvm_handle_sys-- handles a system instruction or mrs/msr instruction trap > + on a guest execution > * @vcpu: The VCPU pointer > * @run: The kvm_run struct > */ > -int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) > +int kvm_handle_sys(struct kvm_vcpu *vcpu, struct kvm_run *run) > { > struct sys_reg_params params; > unsigned long esr = kvm_vcpu_get_hsr(vcpu); > int Rt = kvm_vcpu_sys_get_rt(vcpu); > int ret; > > - trace_kvm_handle_sys_reg(esr); > + trace_kvm_handle_sys(esr); > > params.is_aarch32 = false; > params.is_32bit = false; > @@ -1842,10 +1877,16 @@ int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) > params.regval = vcpu_get_reg(vcpu, Rt); > params.is_write = !(esr & 1); > > - ret = emulate_sys_reg(vcpu, ¶ms); > + if (params.Op0 == 1) { > + /* System instructions */ > + ret = emulate_sys_instr(vcpu, ¶ms); > + } else { > + /* MRS/MSR instructions */ > + ret = emulate_sys_reg(vcpu, ¶ms); > + if (!params.is_write) > + vcpu_set_reg(vcpu, Rt, params.regval); > + } > > - if (!params.is_write) > - vcpu_set_reg(vcpu, Rt, params.regval); > return ret; > } > > diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h > index 5f40987..192708e 100644 > --- a/arch/arm64/kvm/trace.h > +++ b/arch/arm64/kvm/trace.h > @@ -134,7 +134,7 @@ > TP_printk("%s %s reg %d (0x%08llx)", __entry->fn, __entry->is_write?"write to":"read from", __entry->reg, __entry->write_value) > ); > > -TRACE_EVENT(kvm_handle_sys_reg, > +TRACE_EVENT(kvm_handle_sys, > TP_PROTO(unsigned long hsr), > TP_ARGS(hsr), > > -- > 1.9.1 > Thanks, -Christoffer
diff --git a/arch/arm64/include/asm/kvm_coproc.h b/arch/arm64/include/asm/kvm_coproc.h index 0b52377..1b3d21b 100644 --- a/arch/arm64/include/asm/kvm_coproc.h +++ b/arch/arm64/include/asm/kvm_coproc.h @@ -43,7 +43,7 @@ void kvm_register_target_sys_reg_table(unsigned int target, int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run); int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run); int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run); -int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_sys(struct kvm_vcpu *vcpu, struct kvm_run *run); #define kvm_coproc_table_init kvm_sys_reg_table_init void kvm_sys_reg_table_init(void); diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 9259881..d19e253 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -174,7 +174,7 @@ static int kvm_handle_eret(struct kvm_vcpu *vcpu, struct kvm_run *run) [ESR_ELx_EC_SMC32] = handle_smc, [ESR_ELx_EC_HVC64] = handle_hvc, [ESR_ELx_EC_SMC64] = handle_smc, - [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, + [ESR_ELx_EC_SYS64] = kvm_handle_sys, [ESR_ELx_EC_ERET] = kvm_handle_eret, [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort, diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 7062645..dbf5022 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1808,6 +1808,40 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu, return 1; } +static int emulate_tlbi(struct kvm_vcpu *vcpu, + struct sys_reg_params *params) +{ + /* TODO: support tlbi instruction emulation*/ + kvm_inject_undefined(vcpu); + return 1; +} + +static int emulate_at(struct kvm_vcpu *vcpu, + struct sys_reg_params *params) +{ + /* TODO: support address translation instruction emulation */ + kvm_inject_undefined(vcpu); + return 1; +} + +static int emulate_sys_instr(struct kvm_vcpu *vcpu, + struct sys_reg_params *params) +{ + int ret = 0; + + /* TLB maintenance instructions*/ + if (params->CRn == 0b1000) + ret = emulate_tlbi(vcpu, params); + /* Address Translation instructions */ + else if (params->CRn == 0b0111 && params->CRm == 0b1000) + ret = emulate_at(vcpu, params); + + if (ret) + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + + return ret; +} + static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, const struct sys_reg_desc *table, size_t num) { @@ -1819,18 +1853,19 @@ static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, } /** - * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access + * kvm_handle_sys-- handles a system instruction or mrs/msr instruction trap + on a guest execution * @vcpu: The VCPU pointer * @run: The kvm_run struct */ -int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) +int kvm_handle_sys(struct kvm_vcpu *vcpu, struct kvm_run *run) { struct sys_reg_params params; unsigned long esr = kvm_vcpu_get_hsr(vcpu); int Rt = kvm_vcpu_sys_get_rt(vcpu); int ret; - trace_kvm_handle_sys_reg(esr); + trace_kvm_handle_sys(esr); params.is_aarch32 = false; params.is_32bit = false; @@ -1842,10 +1877,16 @@ int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) params.regval = vcpu_get_reg(vcpu, Rt); params.is_write = !(esr & 1); - ret = emulate_sys_reg(vcpu, ¶ms); + if (params.Op0 == 1) { + /* System instructions */ + ret = emulate_sys_instr(vcpu, ¶ms); + } else { + /* MRS/MSR instructions */ + ret = emulate_sys_reg(vcpu, ¶ms); + if (!params.is_write) + vcpu_set_reg(vcpu, Rt, params.regval); + } - if (!params.is_write) - vcpu_set_reg(vcpu, Rt, params.regval); return ret; } diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h index 5f40987..192708e 100644 --- a/arch/arm64/kvm/trace.h +++ b/arch/arm64/kvm/trace.h @@ -134,7 +134,7 @@ TP_printk("%s %s reg %d (0x%08llx)", __entry->fn, __entry->is_write?"write to":"read from", __entry->reg, __entry->write_value) ); -TRACE_EVENT(kvm_handle_sys_reg, +TRACE_EVENT(kvm_handle_sys, TP_PROTO(unsigned long hsr), TP_ARGS(hsr),
When HCR.NV bit is set, execution of the EL2 translation regime address aranslation instructions and TLB maintenance instructions are trapped to EL2. In addition, execution of the EL1 translation regime address aranslation instructions and TLB maintenance instructions that are only accessible from EL2 and above are trapped to EL2. In these cases, ESR_EL2.EC will be set to 0x18. Change the existing handler to handle those system instructions as well as MRS/MSR instructions. Emulation of each system instructions will be done in separate patches. Signed-off-by: Jintack Lim <jintack.lim@linaro.org> --- arch/arm64/include/asm/kvm_coproc.h | 2 +- arch/arm64/kvm/handle_exit.c | 2 +- arch/arm64/kvm/sys_regs.c | 53 ++++++++++++++++++++++++++++++++----- arch/arm64/kvm/trace.h | 2 +- 4 files changed, 50 insertions(+), 9 deletions(-) -- 1.9.1