diff mbox

[v1,1/2] KVM: arm: plug guest debug exploit

Message ID 20170510170200.13285-2-alex.bennee@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Alex Bennée May 10, 2017, 5:01 p.m. UTC 
From: Zhichao Huang <zhichao.huang@linaro.org>

Hardware debugging in guests is not intercepted currently, it means
that a malicious guest can bring down the entire machine by writing
to the debug registers.

This patch enable trapping of all debug registers, preventing the
guests to access the debug registers. This includes access to the
debug mode(DBGDSCR) in the guest world all the time which could
otherwise mess with the host state. Reads return 0 and writes are
ignored.

The result is the guest cannot detect any working hardware based debug
support. As debug exceptions are still routed to the guest normal
debug using software based breakpoints still works.

To support debugging using hardware registers we need to implement a
debug register aware world switch as well as special trapping for
registers that may affect the host state.

Signed-off-by: Zhichao Huang <zhichao.huang@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
ajb:
  - convert to C world switch
  - reword commit message
---
 arch/arm/include/asm/kvm_coproc.h |  3 +-
 arch/arm/kvm/coproc.c             | 82 +++++++++++++++++++++++++++++----------
 arch/arm/kvm/handle_exit.c        |  4 +-
 arch/arm/kvm/hyp/switch.c         |  4 +-
 4 files changed, 69 insertions(+), 24 deletions(-)

Comments

Marc Zyngier May 11, 2017, 7:39 a.m. UTC | #1 
Hi Alex,

On 10/05/17 18:01, Alex Bennée wrote:
> From: Zhichao Huang <zhichao.huang@linaro.org>
> 
> Hardware debugging in guests is not intercepted currently, it means
> that a malicious guest can bring down the entire machine by writing
> to the debug registers.
> 
> This patch enable trapping of all debug registers, preventing the
> guests to access the debug registers. This includes access to the
> debug mode(DBGDSCR) in the guest world all the time which could
> otherwise mess with the host state. Reads return 0 and writes are
> ignored.
> 
> The result is the guest cannot detect any working hardware based debug
> support. As debug exceptions are still routed to the guest normal
> debug using software based breakpoints still works.
> 
> To support debugging using hardware registers we need to implement a
> debug register aware world switch as well as special trapping for
> registers that may affect the host state.
> 
> Signed-off-by: Zhichao Huang <zhichao.huang@linaro.org>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> 
> ---
> ajb:
>   - convert to C world switch
>   - reword commit message
> ---
>  arch/arm/include/asm/kvm_coproc.h |  3 +-
>  arch/arm/kvm/coproc.c             | 82 +++++++++++++++++++++++++++++----------
>  arch/arm/kvm/handle_exit.c        |  4 +-
>  arch/arm/kvm/hyp/switch.c         |  4 +-
>  4 files changed, 69 insertions(+), 24 deletions(-)
> 
> diff --git a/arch/arm/include/asm/kvm_coproc.h b/arch/arm/include/asm/kvm_coproc.h
> index 4917c2f7e459..e74ab0fbab79 100644
> --- a/arch/arm/include/asm/kvm_coproc.h
> +++ b/arch/arm/include/asm/kvm_coproc.h
> @@ -31,7 +31,8 @@ void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table);
>  int kvm_handle_cp10_id(struct kvm_vcpu *vcpu, struct kvm_run *run);
>  int kvm_handle_cp_0_13_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
>  int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run);
> -int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
> +int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run);
> +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);
>  
> diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
> index 3e5e4194ef86..b2053393bb1f 100644
> --- a/arch/arm/kvm/coproc.c
> +++ b/arch/arm/kvm/coproc.c
> @@ -93,12 +93,6 @@ int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run)
>  	return 1;
>  }
>  
> -int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run)
> -{
> -	kvm_inject_undefined(vcpu);
> -	return 1;
> -}
> -
>  static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
>  {
>  	/*
> @@ -514,12 +508,8 @@ static int emulate_cp15(struct kvm_vcpu *vcpu,
>  	return 1;
>  }
>  
> -/**
> - * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
> - * @vcpu: The VCPU pointer
> - * @run:  The kvm_run struct
> - */
> -int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
> +static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, struct kvm_run *run,
> +			    bool cp15)
>  {
>  	struct coproc_params params;
>  
> @@ -533,7 +523,35 @@ int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
>  	params.Rt2 = (kvm_vcpu_get_hsr(vcpu) >> 10) & 0xf;
>  	params.CRm = 0;
>  
> -	return emulate_cp15(vcpu, &params);
> +	if (cp15)
> +		return emulate_cp15(vcpu, &params);
> +
> +	/* raz_wi cp14 */
> +	(void)pm_fake(vcpu, &params, NULL);

Why this (void) cast?

> +
> +	/* handled */
> +	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
> +	return 1;
> +}
> +
> +/**
> + * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
> + * @vcpu: The VCPU pointer
> + * @run:  The kvm_run struct
> + */
> +int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
> +{
> +	return kvm_handle_cp_64(vcpu, run, 1);

true instead of 1?

> +}
> +
> +/**
> + * kvm_handle_cp14_64 -- handles a mrrc/mcrr trap on a guest CP14 access
> + * @vcpu: The VCPU pointer
> + * @run:  The kvm_run struct
> + */
> +int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
> +{
> +	return kvm_handle_cp_64(vcpu, run, 0);

false?

>  }
>  
>  static void reset_coproc_regs(struct kvm_vcpu *vcpu,
> @@ -546,12 +564,8 @@ static void reset_coproc_regs(struct kvm_vcpu *vcpu,
>  			table[i].reset(vcpu, &table[i]);
>  }
>  
> -/**
> - * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
> - * @vcpu: The VCPU pointer
> - * @run:  The kvm_run struct
> - */
> -int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
> +static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, struct kvm_run *run,
> +			      bool cp15)
>  {
>  	struct coproc_params params;
>  
> @@ -565,7 +579,35 @@ int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
>  	params.Op2 = (kvm_vcpu_get_hsr(vcpu) >> 17) & 0x7;
>  	params.Rt2 = 0;
>  
> -	return emulate_cp15(vcpu, &params);
> +	if (cp15)
> +		return emulate_cp15(vcpu, &params);
> +
> +	/* raz_wi cp14 */
> +	(void)pm_fake(vcpu, &params, NULL);
> +
> +	/* handled */
> +	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
> +	return 1;
> +}
> +
> +/**
> + * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
> + * @vcpu: The VCPU pointer
> + * @run:  The kvm_run struct
> + */
> +int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
> +{
> +	return kvm_handle_cp_32(vcpu, run, 1);
> +}
> +
> +/**
> + * kvm_handle_cp14_32 -- handles a mrc/mcr trap on a guest CP14 access
> + * @vcpu: The VCPU pointer
> + * @run:  The kvm_run struct
> + */
> +int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
> +{
> +	return kvm_handle_cp_32(vcpu, run, 0);
>  }
>  
>  /******************************************************************************
> diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
> index 96af65a30d78..42f5daf715d0 100644
> --- a/arch/arm/kvm/handle_exit.c
> +++ b/arch/arm/kvm/handle_exit.c
> @@ -95,9 +95,9 @@ static exit_handle_fn arm_exit_handlers[] = {
>  	[HSR_EC_WFI]		= kvm_handle_wfx,
>  	[HSR_EC_CP15_32]	= kvm_handle_cp15_32,
>  	[HSR_EC_CP15_64]	= kvm_handle_cp15_64,
> -	[HSR_EC_CP14_MR]	= kvm_handle_cp14_access,
> +	[HSR_EC_CP14_MR]	= kvm_handle_cp14_32,
>  	[HSR_EC_CP14_LS]	= kvm_handle_cp14_load_store,
> -	[HSR_EC_CP14_64]	= kvm_handle_cp14_access,
> +	[HSR_EC_CP14_64]	= kvm_handle_cp14_64,

It feels a bit odd to have separate methods at this level, converging
onto a single one that has to apply separate treatments in
kvm_handle_cp_{32,64} depending on the CP number. I wonder if it
wouldn't be nicer to either keep the paths separate entirely, or have a
single access method that does it all.

>  	[HSR_EC_CP_0_13]	= kvm_handle_cp_0_13_access,
>  	[HSR_EC_CP10_ID]	= kvm_handle_cp10_id,
>  	[HSR_EC_HVC]		= handle_hvc,
> diff --git a/arch/arm/kvm/hyp/switch.c b/arch/arm/kvm/hyp/switch.c
> index 92678b7bd046..624a510d31df 100644
> --- a/arch/arm/kvm/hyp/switch.c
> +++ b/arch/arm/kvm/hyp/switch.c
> @@ -48,7 +48,9 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu, u32 *fpexc_host)
>  	write_sysreg(HSTR_T(15), HSTR);
>  	write_sysreg(HCPTR_TTA | HCPTR_TCP(10) | HCPTR_TCP(11), HCPTR);
>  	val = read_sysreg(HDCR);
> -	write_sysreg(val | HDCR_TPM | HDCR_TPMCR, HDCR);
> +	val |= HDCR_TPM | HDCR_TPMCR; /* trap performance monitors */
> +	val |= HDCR_TDRA | HDCR_TDOSA | HDCR_TDA; /* trap debug regs */
> +	write_sysreg(val, HDCR);
>  }
>  
>  static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)
> 

Thanks,

	M.
Alex Bennée May 11, 2017, 10:07 a.m. UTC | #2 
Marc Zyngier <marc.zyngier@arm.com> writes:

> Hi Alex,
>
> On 10/05/17 18:01, Alex Bennée wrote:
>> From: Zhichao Huang <zhichao.huang@linaro.org>
>>
>> Hardware debugging in guests is not intercepted currently, it means
>> that a malicious guest can bring down the entire machine by writing
>> to the debug registers.
>>
>> This patch enable trapping of all debug registers, preventing the
>> guests to access the debug registers. This includes access to the
>> debug mode(DBGDSCR) in the guest world all the time which could
>> otherwise mess with the host state. Reads return 0 and writes are
>> ignored.
>>
>> The result is the guest cannot detect any working hardware based debug
>> support. As debug exceptions are still routed to the guest normal
>> debug using software based breakpoints still works.
>>
>> To support debugging using hardware registers we need to implement a
>> debug register aware world switch as well as special trapping for
>> registers that may affect the host state.
>>
>> Signed-off-by: Zhichao Huang <zhichao.huang@linaro.org>
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>>
>> ---
>> ajb:
>>   - convert to C world switch
>>   - reword commit message
>> ---
>>  arch/arm/include/asm/kvm_coproc.h |  3 +-
>>  arch/arm/kvm/coproc.c             | 82 +++++++++++++++++++++++++++++----------
>>  arch/arm/kvm/handle_exit.c        |  4 +-
>>  arch/arm/kvm/hyp/switch.c         |  4 +-
>>  4 files changed, 69 insertions(+), 24 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/kvm_coproc.h b/arch/arm/include/asm/kvm_coproc.h
>> index 4917c2f7e459..e74ab0fbab79 100644
>> --- a/arch/arm/include/asm/kvm_coproc.h
>> +++ b/arch/arm/include/asm/kvm_coproc.h
>> @@ -31,7 +31,8 @@ void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table);
>>  int kvm_handle_cp10_id(struct kvm_vcpu *vcpu, struct kvm_run *run);
>>  int kvm_handle_cp_0_13_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
>>  int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run);
>> -int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
>> +int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run);
>> +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);
>>
>> diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
>> index 3e5e4194ef86..b2053393bb1f 100644
>> --- a/arch/arm/kvm/coproc.c
>> +++ b/arch/arm/kvm/coproc.c
>> @@ -93,12 +93,6 @@ int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run)
>>  	return 1;
>>  }
>>
>> -int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run)
>> -{
>> -	kvm_inject_undefined(vcpu);
>> -	return 1;
>> -}
>> -
>>  static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
>>  {
>>  	/*
>> @@ -514,12 +508,8 @@ static int emulate_cp15(struct kvm_vcpu *vcpu,
>>  	return 1;
>>  }
>>
>> -/**
>> - * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
>> - * @vcpu: The VCPU pointer
>> - * @run:  The kvm_run struct
>> - */
>> -int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
>> +static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, struct kvm_run *run,
>> +			    bool cp15)
>>  {
>>  	struct coproc_params params;
>>
>> @@ -533,7 +523,35 @@ int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
>>  	params.Rt2 = (kvm_vcpu_get_hsr(vcpu) >> 10) & 0xf;
>>  	params.CRm = 0;
>>
>> -	return emulate_cp15(vcpu, &params);
>> +	if (cp15)
>> +		return emulate_cp15(vcpu, &params);
>> +
>> +	/* raz_wi cp14 */
>> +	(void)pm_fake(vcpu, &params, NULL);
>
> Why this (void) cast?

I guess a super picky compiler could complain about throwing away a
return value? Mine didn't do I've removed it.

>
>> +
>> +	/* handled */
>> +	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
>> +	return 1;
>> +}
>> +
>> +/**
>> + * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
>> + * @vcpu: The VCPU pointer
>> + * @run:  The kvm_run struct
>> + */
>> +int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
>> +{
>> +	return kvm_handle_cp_64(vcpu, run, 1);
>
> true instead of 1?

fixed

>
>> +}
>> +
>> +/**
>> + * kvm_handle_cp14_64 -- handles a mrrc/mcrr trap on a guest CP14 access
>> + * @vcpu: The VCPU pointer
>> + * @run:  The kvm_run struct
>> + */
>> +int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
>> +{
>> +	return kvm_handle_cp_64(vcpu, run, 0);
>
> false?

fixed

>
>>  }
>>
>>  static void reset_coproc_regs(struct kvm_vcpu *vcpu,
>> @@ -546,12 +564,8 @@ static void reset_coproc_regs(struct kvm_vcpu *vcpu,
>>  			table[i].reset(vcpu, &table[i]);
>>  }
>>
>> -/**
>> - * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
>> - * @vcpu: The VCPU pointer
>> - * @run:  The kvm_run struct
>> - */
>> -int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
>> +static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, struct kvm_run *run,
>> +			      bool cp15)
>>  {
>>  	struct coproc_params params;
>>
>> @@ -565,7 +579,35 @@ int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
>>  	params.Op2 = (kvm_vcpu_get_hsr(vcpu) >> 17) & 0x7;
>>  	params.Rt2 = 0;
>>
>> -	return emulate_cp15(vcpu, &params);
>> +	if (cp15)
>> +		return emulate_cp15(vcpu, &params);
>> +
>> +	/* raz_wi cp14 */
>> +	(void)pm_fake(vcpu, &params, NULL);
>> +
>> +	/* handled */
>> +	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
>> +	return 1;
>> +}
>> +
>> +/**
>> + * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
>> + * @vcpu: The VCPU pointer
>> + * @run:  The kvm_run struct
>> + */
>> +int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
>> +{
>> +	return kvm_handle_cp_32(vcpu, run, 1);
>> +}
>> +
>> +/**
>> + * kvm_handle_cp14_32 -- handles a mrc/mcr trap on a guest CP14 access
>> + * @vcpu: The VCPU pointer
>> + * @run:  The kvm_run struct
>> + */
>> +int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
>> +{
>> +	return kvm_handle_cp_32(vcpu, run, 0);
>>  }
>>
>>  /******************************************************************************
>> diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
>> index 96af65a30d78..42f5daf715d0 100644
>> --- a/arch/arm/kvm/handle_exit.c
>> +++ b/arch/arm/kvm/handle_exit.c
>> @@ -95,9 +95,9 @@ static exit_handle_fn arm_exit_handlers[] = {
>>  	[HSR_EC_WFI]		= kvm_handle_wfx,
>>  	[HSR_EC_CP15_32]	= kvm_handle_cp15_32,
>>  	[HSR_EC_CP15_64]	= kvm_handle_cp15_64,
>> -	[HSR_EC_CP14_MR]	= kvm_handle_cp14_access,
>> +	[HSR_EC_CP14_MR]	= kvm_handle_cp14_32,
>>  	[HSR_EC_CP14_LS]	= kvm_handle_cp14_load_store,
>> -	[HSR_EC_CP14_64]	= kvm_handle_cp14_access,
>> +	[HSR_EC_CP14_64]	= kvm_handle_cp14_64,
>
> It feels a bit odd to have separate methods at this level, converging
> onto a single one that has to apply separate treatments in
> kvm_handle_cp_{32,64} depending on the CP number. I wonder if it
> wouldn't be nicer to either keep the paths separate entirely, or have a
> single access method that does it all.

I've separated the cp14 and cp15 paths with a light bit of re-factoring
to extract params.

>
>>  	[HSR_EC_CP_0_13]	= kvm_handle_cp_0_13_access,
>>  	[HSR_EC_CP10_ID]	= kvm_handle_cp10_id,
>>  	[HSR_EC_HVC]		= handle_hvc,
>> diff --git a/arch/arm/kvm/hyp/switch.c b/arch/arm/kvm/hyp/switch.c
>> index 92678b7bd046..624a510d31df 100644
>> --- a/arch/arm/kvm/hyp/switch.c
>> +++ b/arch/arm/kvm/hyp/switch.c
>> @@ -48,7 +48,9 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu, u32 *fpexc_host)
>>  	write_sysreg(HSTR_T(15), HSTR);
>>  	write_sysreg(HCPTR_TTA | HCPTR_TCP(10) | HCPTR_TCP(11), HCPTR);
>>  	val = read_sysreg(HDCR);
>> -	write_sysreg(val | HDCR_TPM | HDCR_TPMCR, HDCR);
>> +	val |= HDCR_TPM | HDCR_TPMCR; /* trap performance monitors */
>> +	val |= HDCR_TDRA | HDCR_TDOSA | HDCR_TDA; /* trap debug regs */
>> +	write_sysreg(val, HDCR);
>>  }
>>
>>  static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)
>>
>
> Thanks,


Cheers, I'll send v2 soon.

--
Alex Bennée
diff mbox

Patch

diff --git a/arch/arm/include/asm/kvm_coproc.h b/arch/arm/include/asm/kvm_coproc.h
index 4917c2f7e459..e74ab0fbab79 100644
--- a/arch/arm/include/asm/kvm_coproc.h
+++ b/arch/arm/include/asm/kvm_coproc.h
@@ -31,7 +31,8 @@  void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table);
 int kvm_handle_cp10_id(struct kvm_vcpu *vcpu, struct kvm_run *run);
 int kvm_handle_cp_0_13_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run);
-int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
+int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run);
+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);
 
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index 3e5e4194ef86..b2053393bb1f 100644
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -93,12 +93,6 @@  int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	return 1;
 }
 
-int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
-	kvm_inject_undefined(vcpu);
-	return 1;
-}
-
 static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
 {
 	/*
@@ -514,12 +508,8 @@  static int emulate_cp15(struct kvm_vcpu *vcpu,
 	return 1;
 }
 
-/**
- * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
- * @vcpu: The VCPU pointer
- * @run:  The kvm_run struct
- */
-int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
+static int kvm_handle_cp_64(struct kvm_vcpu *vcpu, struct kvm_run *run,
+			    bool cp15)
 {
 	struct coproc_params params;
 
@@ -533,7 +523,35 @@  int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	params.Rt2 = (kvm_vcpu_get_hsr(vcpu) >> 10) & 0xf;
 	params.CRm = 0;
 
-	return emulate_cp15(vcpu, &params);
+	if (cp15)
+		return emulate_cp15(vcpu, &params);
+
+	/* raz_wi cp14 */
+	(void)pm_fake(vcpu, &params, NULL);
+
+	/* handled */
+	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+	return 1;
+}
+
+/**
+ * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+	return kvm_handle_cp_64(vcpu, run, 1);
+}
+
+/**
+ * kvm_handle_cp14_64 -- handles a mrrc/mcrr trap on a guest CP14 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+	return kvm_handle_cp_64(vcpu, run, 0);
 }
 
 static void reset_coproc_regs(struct kvm_vcpu *vcpu,
@@ -546,12 +564,8 @@  static void reset_coproc_regs(struct kvm_vcpu *vcpu,
 			table[i].reset(vcpu, &table[i]);
 }
 
-/**
- * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
- * @vcpu: The VCPU pointer
- * @run:  The kvm_run struct
- */
-int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
+static int kvm_handle_cp_32(struct kvm_vcpu *vcpu, struct kvm_run *run,
+			      bool cp15)
 {
 	struct coproc_params params;
 
@@ -565,7 +579,35 @@  int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	params.Op2 = (kvm_vcpu_get_hsr(vcpu) >> 17) & 0x7;
 	params.Rt2 = 0;
 
-	return emulate_cp15(vcpu, &params);
+	if (cp15)
+		return emulate_cp15(vcpu, &params);
+
+	/* raz_wi cp14 */
+	(void)pm_fake(vcpu, &params, NULL);
+
+	/* handled */
+	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+	return 1;
+}
+
+/**
+ * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+	return kvm_handle_cp_32(vcpu, run, 1);
+}
+
+/**
+ * kvm_handle_cp14_32 -- handles a mrc/mcr trap on a guest CP14 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+	return kvm_handle_cp_32(vcpu, run, 0);
 }
 
 /******************************************************************************
diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index 96af65a30d78..42f5daf715d0 100644
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -95,9 +95,9 @@  static exit_handle_fn arm_exit_handlers[] = {
 	[HSR_EC_WFI]		= kvm_handle_wfx,
 	[HSR_EC_CP15_32]	= kvm_handle_cp15_32,
 	[HSR_EC_CP15_64]	= kvm_handle_cp15_64,
-	[HSR_EC_CP14_MR]	= kvm_handle_cp14_access,
+	[HSR_EC_CP14_MR]	= kvm_handle_cp14_32,
 	[HSR_EC_CP14_LS]	= kvm_handle_cp14_load_store,
-	[HSR_EC_CP14_64]	= kvm_handle_cp14_access,
+	[HSR_EC_CP14_64]	= kvm_handle_cp14_64,
 	[HSR_EC_CP_0_13]	= kvm_handle_cp_0_13_access,
 	[HSR_EC_CP10_ID]	= kvm_handle_cp10_id,
 	[HSR_EC_HVC]		= handle_hvc,
diff --git a/arch/arm/kvm/hyp/switch.c b/arch/arm/kvm/hyp/switch.c
index 92678b7bd046..624a510d31df 100644
--- a/arch/arm/kvm/hyp/switch.c
+++ b/arch/arm/kvm/hyp/switch.c
@@ -48,7 +48,9 @@  static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu, u32 *fpexc_host)
 	write_sysreg(HSTR_T(15), HSTR);
 	write_sysreg(HCPTR_TTA | HCPTR_TCP(10) | HCPTR_TCP(11), HCPTR);
 	val = read_sysreg(HDCR);
-	write_sysreg(val | HDCR_TPM | HDCR_TPMCR, HDCR);
+	val |= HDCR_TPM | HDCR_TPMCR; /* trap performance monitors */
+	val |= HDCR_TDRA | HDCR_TDOSA | HDCR_TDA; /* trap debug regs */
+	write_sysreg(val, HDCR);
 }
 
 static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)