[v2,07/15] KVM: arm64: handle ITS related GICv3 redistributor registers
diff mbox

Message ID 1436538111-4294-8-git-send-email-andre.przywara@arm.com
State New
Headers show

Commit Message

Andre Przywara July 10, 2015, 2:21 p.m. UTC
In the GICv3 redistributor there are the PENDBASER and PROPBASER
registers which we did not emulate so far, as they only make sense
when having an ITS. In preparation for that emulate those MMIO
accesses by storing the 64-bit data written into it into a variable
which we later read in the ITS emulation.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 include/kvm/arm_vgic.h      |  8 ++++++++
 virt/kvm/arm/vgic-v3-emul.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 virt/kvm/arm/vgic.c         | 35 +++++++++++++++++++++++++++++++++++
 virt/kvm/arm/vgic.h         |  4 ++++
 4 files changed, 91 insertions(+)

Comments

Eric Auger Aug. 13, 2015, 12:17 p.m. UTC | #1
On 07/10/2015 04:21 PM, Andre Przywara wrote:
> In the GICv3 redistributor there are the PENDBASER and PROPBASER
> registers which we did not emulate so far, as they only make sense
> when having an ITS. In preparation for that emulate those MMIO
> accesses by storing the 64-bit data written into it into a variable
> which we later read in the ITS emulation.
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
>  include/kvm/arm_vgic.h      |  8 ++++++++
>  virt/kvm/arm/vgic-v3-emul.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
>  virt/kvm/arm/vgic.c         | 35 +++++++++++++++++++++++++++++++++++
>  virt/kvm/arm/vgic.h         |  4 ++++
>  4 files changed, 91 insertions(+)
> 
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index 3ee063b..8c6cb0e 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -256,6 +256,14 @@ struct vgic_dist {
>  	struct vgic_vm_ops	vm_ops;
>  	struct vgic_io_device	dist_iodev;
>  	struct vgic_io_device	*redist_iodevs;
> +
> +	/* Address of LPI configuration table shared by all redistributors */
> +	u64			propbaser;
> +
> +	/* Addresses of LPI pending tables per redistributor */
> +	u64			*pendbaser;
> +
> +	bool			lpis_enabled;
>  };
>  
>  struct vgic_v2_cpu_if {
> diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
> index a8cf669..5269ad1 100644
> --- a/virt/kvm/arm/vgic-v3-emul.c
> +++ b/virt/kvm/arm/vgic-v3-emul.c
> @@ -651,6 +651,38 @@ static bool handle_mmio_cfg_reg_redist(struct kvm_vcpu *vcpu,
>  	return vgic_handle_cfg_reg(reg, mmio, offset);
>  }
>  
> +/* We don't trigger any actions here, just store the register value */
> +static bool handle_mmio_propbaser_redist(struct kvm_vcpu *vcpu,
> +					 struct kvm_exit_mmio *mmio,
> +					 phys_addr_t offset)
> +{
> +	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
> +	int mode = ACCESS_READ_VALUE;
> +
> +	/* Storing a value with LPIs already enabled is undefined */
> +	mode |= dist->lpis_enabled ? ACCESS_WRITE_IGNORED : ACCESS_WRITE_VALUE;
> +	vgic_handle_base_register(vcpu, mmio, offset, &dist->propbaser, mode);
> +
> +	return false;
> +}
> +
> +/* We don't trigger any actions here, just store the register value */
> +static bool handle_mmio_pendbaser_redist(struct kvm_vcpu *vcpu,
> +					 struct kvm_exit_mmio *mmio,
> +					 phys_addr_t offset)
> +{
> +	struct kvm_vcpu *rdvcpu = mmio->private;
> +	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
> +	int mode = ACCESS_READ_VALUE;
> +
> +	/* Storing a value with LPIs already enabled is undefined */
> +	mode |= dist->lpis_enabled ? ACCESS_WRITE_IGNORED : ACCESS_WRITE_VALUE;
> +	vgic_handle_base_register(vcpu, mmio, offset,
> +				  &dist->pendbaser[rdvcpu->vcpu_id], mode);
> +
> +	return false;
> +}
> +
>  #define SGI_base(x) ((x) + SZ_64K)
>  
>  static const struct vgic_io_range vgic_redist_ranges[] = {
> @@ -679,6 +711,18 @@ static const struct vgic_io_range vgic_redist_ranges[] = {
>  		.handle_mmio    = handle_mmio_raz_wi,
>  	},
>  	{
> +		.base		= GICR_PENDBASER,
> +		.len		= 0x08,
> +		.bits_per_irq	= 0,
> +		.handle_mmio	= handle_mmio_pendbaser_redist,
> +	},
> +	{
> +		.base		= GICR_PROPBASER,
> +		.len		= 0x08,
> +		.bits_per_irq	= 0,
> +		.handle_mmio	= handle_mmio_propbaser_redist,
> +	},
> +	{
>  		.base           = GICR_IDREGS,
>  		.len            = 0x30,
>  		.bits_per_irq   = 0,
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 15e447f..49ee92b 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -446,6 +446,41 @@ void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
>  	}
>  }
>  
> +/* handle a 64-bit register access */
> +void vgic_handle_base_register(struct kvm_vcpu *vcpu,
> +			       struct kvm_exit_mmio *mmio,
> +			       phys_addr_t offset, u64 *basereg,
> +			       int mode)
> +{
why do we have vcpu in the proto? I don't see it used. Also if it were
can't we fetch it from mmio->private?

why not renaming this into something like vgic_reg64_access as par
vgic_reg_access 32b flavor above. vgic_handle* usually is the name of
the region handler returning bool?


> +	u32 reg;
> +	u64 breg;
> +
> +	switch (offset & ~3) {
> +	case 0x00:
> +		breg = *basereg;
> +		reg = lower_32_bits(breg);
> +		vgic_reg_access(mmio, &reg, offset & 3, mode);
> +		if (mmio->is_write && (mode & ACCESS_WRITE_VALUE)) {
> +			breg &= GENMASK_ULL(63, 32);
> +			breg |= reg;
> +			*basereg = breg;
> +		}
> +		break;
> +	case 0x04:
> +		breg = *basereg;
> +		reg = upper_32_bits(breg);
> +		vgic_reg_access(mmio, &reg, offset & 3, mode);
> +		if (mmio->is_write && (mode & ACCESS_WRITE_VALUE)) {
> +			breg  = lower_32_bits(breg);
> +			breg |= (u64)reg << 32;
> +			*basereg = breg;
> +		}
> +		break;
> +	}
> +}
> +
> +
> +
some spare white lines

Best Regards

Eric
>  bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
>  			phys_addr_t offset)
>  {
> diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
> index a093f5c..b2d791c 100644
> --- a/virt/kvm/arm/vgic.h
> +++ b/virt/kvm/arm/vgic.h
> @@ -71,6 +71,10 @@ void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
>  		     phys_addr_t offset, int mode);
>  bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
>  			phys_addr_t offset);
> +void vgic_handle_base_register(struct kvm_vcpu *vcpu,
> +			       struct kvm_exit_mmio *mmio,
> +			       phys_addr_t offset, u64 *basereg,
> +			       int mode);
>  
>  static inline
>  u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
> 

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Andre Przywara Aug. 24, 2015, 6:08 p.m. UTC | #2
Hi Eric,

On 13/08/15 13:17, Eric Auger wrote:
> On 07/10/2015 04:21 PM, Andre Przywara wrote:
>> In the GICv3 redistributor there are the PENDBASER and PROPBASER
>> registers which we did not emulate so far, as they only make sense
>> when having an ITS. In preparation for that emulate those MMIO
>> accesses by storing the 64-bit data written into it into a variable
>> which we later read in the ITS emulation.
>>
>> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
>> ---
>>  include/kvm/arm_vgic.h      |  8 ++++++++
>>  virt/kvm/arm/vgic-v3-emul.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
>>  virt/kvm/arm/vgic.c         | 35 +++++++++++++++++++++++++++++++++++
>>  virt/kvm/arm/vgic.h         |  4 ++++
>>  4 files changed, 91 insertions(+)
>>
>> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
>> index 3ee063b..8c6cb0e 100644
>> --- a/include/kvm/arm_vgic.h
>> +++ b/include/kvm/arm_vgic.h
>> @@ -256,6 +256,14 @@ struct vgic_dist {
>>  	struct vgic_vm_ops	vm_ops;
>>  	struct vgic_io_device	dist_iodev;
>>  	struct vgic_io_device	*redist_iodevs;
>> +
>> +	/* Address of LPI configuration table shared by all redistributors */
>> +	u64			propbaser;
>> +
>> +	/* Addresses of LPI pending tables per redistributor */
>> +	u64			*pendbaser;
>> +
>> +	bool			lpis_enabled;
>>  };
>>  
>>  struct vgic_v2_cpu_if {
>> diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
>> index a8cf669..5269ad1 100644
>> --- a/virt/kvm/arm/vgic-v3-emul.c
>> +++ b/virt/kvm/arm/vgic-v3-emul.c
>> @@ -651,6 +651,38 @@ static bool handle_mmio_cfg_reg_redist(struct kvm_vcpu *vcpu,
>>  	return vgic_handle_cfg_reg(reg, mmio, offset);
>>  }
>>  
>> +/* We don't trigger any actions here, just store the register value */
>> +static bool handle_mmio_propbaser_redist(struct kvm_vcpu *vcpu,
>> +					 struct kvm_exit_mmio *mmio,
>> +					 phys_addr_t offset)
>> +{
>> +	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
>> +	int mode = ACCESS_READ_VALUE;
>> +
>> +	/* Storing a value with LPIs already enabled is undefined */
>> +	mode |= dist->lpis_enabled ? ACCESS_WRITE_IGNORED : ACCESS_WRITE_VALUE;
>> +	vgic_handle_base_register(vcpu, mmio, offset, &dist->propbaser, mode);
>> +
>> +	return false;
>> +}
>> +
>> +/* We don't trigger any actions here, just store the register value */
>> +static bool handle_mmio_pendbaser_redist(struct kvm_vcpu *vcpu,
>> +					 struct kvm_exit_mmio *mmio,
>> +					 phys_addr_t offset)
>> +{
>> +	struct kvm_vcpu *rdvcpu = mmio->private;
>> +	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
>> +	int mode = ACCESS_READ_VALUE;
>> +
>> +	/* Storing a value with LPIs already enabled is undefined */
>> +	mode |= dist->lpis_enabled ? ACCESS_WRITE_IGNORED : ACCESS_WRITE_VALUE;
>> +	vgic_handle_base_register(vcpu, mmio, offset,
>> +				  &dist->pendbaser[rdvcpu->vcpu_id], mode);
>> +
>> +	return false;
>> +}
>> +
>>  #define SGI_base(x) ((x) + SZ_64K)
>>  
>>  static const struct vgic_io_range vgic_redist_ranges[] = {
>> @@ -679,6 +711,18 @@ static const struct vgic_io_range vgic_redist_ranges[] = {
>>  		.handle_mmio    = handle_mmio_raz_wi,
>>  	},
>>  	{
>> +		.base		= GICR_PENDBASER,
>> +		.len		= 0x08,
>> +		.bits_per_irq	= 0,
>> +		.handle_mmio	= handle_mmio_pendbaser_redist,
>> +	},
>> +	{
>> +		.base		= GICR_PROPBASER,
>> +		.len		= 0x08,
>> +		.bits_per_irq	= 0,
>> +		.handle_mmio	= handle_mmio_propbaser_redist,
>> +	},
>> +	{
>>  		.base           = GICR_IDREGS,
>>  		.len            = 0x30,
>>  		.bits_per_irq   = 0,
>> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
>> index 15e447f..49ee92b 100644
>> --- a/virt/kvm/arm/vgic.c
>> +++ b/virt/kvm/arm/vgic.c
>> @@ -446,6 +446,41 @@ void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
>>  	}
>>  }
>>  
>> +/* handle a 64-bit register access */
>> +void vgic_handle_base_register(struct kvm_vcpu *vcpu,
>> +			       struct kvm_exit_mmio *mmio,
>> +			       phys_addr_t offset, u64 *basereg,
>> +			       int mode)
>> +{
> why do we have vcpu in the proto? I don't see it used. Also if it were
> can't we fetch it from mmio->private?
> 
> why not renaming this into something like vgic_reg64_access as par
> vgic_reg_access 32b flavor above. vgic_handle* usually is the name of
> the region handler returning bool?

Makes sense, I both renamed the function and removed the vcpu parameter.
I need to check whether we need the vcpu to do some endianness checks in
the future, though. Using mmio->private would be a hack, then.

Cheers,
Andre.

> 
>> +	u32 reg;
>> +	u64 breg;
>> +
>> +	switch (offset & ~3) {
>> +	case 0x00:
>> +		breg = *basereg;
>> +		reg = lower_32_bits(breg);
>> +		vgic_reg_access(mmio, &reg, offset & 3, mode);
>> +		if (mmio->is_write && (mode & ACCESS_WRITE_VALUE)) {
>> +			breg &= GENMASK_ULL(63, 32);
>> +			breg |= reg;
>> +			*basereg = breg;
>> +		}
>> +		break;
>> +	case 0x04:
>> +		breg = *basereg;
>> +		reg = upper_32_bits(breg);
>> +		vgic_reg_access(mmio, &reg, offset & 3, mode);
>> +		if (mmio->is_write && (mode & ACCESS_WRITE_VALUE)) {
>> +			breg  = lower_32_bits(breg);
>> +			breg |= (u64)reg << 32;
>> +			*basereg = breg;
>> +		}
>> +		break;
>> +	}
>> +}
>> +
>> +
>> +
> some spare white lines
> 
> Best Regards
> 
> Eric
>>  bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
>>  			phys_addr_t offset)
>>  {
>> diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
>> index a093f5c..b2d791c 100644
>> --- a/virt/kvm/arm/vgic.h
>> +++ b/virt/kvm/arm/vgic.h
>> @@ -71,6 +71,10 @@ void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
>>  		     phys_addr_t offset, int mode);
>>  bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
>>  			phys_addr_t offset);
>> +void vgic_handle_base_register(struct kvm_vcpu *vcpu,
>> +			       struct kvm_exit_mmio *mmio,
>> +			       phys_addr_t offset, u64 *basereg,
>> +			       int mode);
>>  
>>  static inline
>>  u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
>>
> 
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Patch
diff mbox

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 3ee063b..8c6cb0e 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -256,6 +256,14 @@  struct vgic_dist {
 	struct vgic_vm_ops	vm_ops;
 	struct vgic_io_device	dist_iodev;
 	struct vgic_io_device	*redist_iodevs;
+
+	/* Address of LPI configuration table shared by all redistributors */
+	u64			propbaser;
+
+	/* Addresses of LPI pending tables per redistributor */
+	u64			*pendbaser;
+
+	bool			lpis_enabled;
 };
 
 struct vgic_v2_cpu_if {
diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
index a8cf669..5269ad1 100644
--- a/virt/kvm/arm/vgic-v3-emul.c
+++ b/virt/kvm/arm/vgic-v3-emul.c
@@ -651,6 +651,38 @@  static bool handle_mmio_cfg_reg_redist(struct kvm_vcpu *vcpu,
 	return vgic_handle_cfg_reg(reg, mmio, offset);
 }
 
+/* We don't trigger any actions here, just store the register value */
+static bool handle_mmio_propbaser_redist(struct kvm_vcpu *vcpu,
+					 struct kvm_exit_mmio *mmio,
+					 phys_addr_t offset)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int mode = ACCESS_READ_VALUE;
+
+	/* Storing a value with LPIs already enabled is undefined */
+	mode |= dist->lpis_enabled ? ACCESS_WRITE_IGNORED : ACCESS_WRITE_VALUE;
+	vgic_handle_base_register(vcpu, mmio, offset, &dist->propbaser, mode);
+
+	return false;
+}
+
+/* We don't trigger any actions here, just store the register value */
+static bool handle_mmio_pendbaser_redist(struct kvm_vcpu *vcpu,
+					 struct kvm_exit_mmio *mmio,
+					 phys_addr_t offset)
+{
+	struct kvm_vcpu *rdvcpu = mmio->private;
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int mode = ACCESS_READ_VALUE;
+
+	/* Storing a value with LPIs already enabled is undefined */
+	mode |= dist->lpis_enabled ? ACCESS_WRITE_IGNORED : ACCESS_WRITE_VALUE;
+	vgic_handle_base_register(vcpu, mmio, offset,
+				  &dist->pendbaser[rdvcpu->vcpu_id], mode);
+
+	return false;
+}
+
 #define SGI_base(x) ((x) + SZ_64K)
 
 static const struct vgic_io_range vgic_redist_ranges[] = {
@@ -679,6 +711,18 @@  static const struct vgic_io_range vgic_redist_ranges[] = {
 		.handle_mmio    = handle_mmio_raz_wi,
 	},
 	{
+		.base		= GICR_PENDBASER,
+		.len		= 0x08,
+		.bits_per_irq	= 0,
+		.handle_mmio	= handle_mmio_pendbaser_redist,
+	},
+	{
+		.base		= GICR_PROPBASER,
+		.len		= 0x08,
+		.bits_per_irq	= 0,
+		.handle_mmio	= handle_mmio_propbaser_redist,
+	},
+	{
 		.base           = GICR_IDREGS,
 		.len            = 0x30,
 		.bits_per_irq   = 0,
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 15e447f..49ee92b 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -446,6 +446,41 @@  void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
 	}
 }
 
+/* handle a 64-bit register access */
+void vgic_handle_base_register(struct kvm_vcpu *vcpu,
+			       struct kvm_exit_mmio *mmio,
+			       phys_addr_t offset, u64 *basereg,
+			       int mode)
+{
+	u32 reg;
+	u64 breg;
+
+	switch (offset & ~3) {
+	case 0x00:
+		breg = *basereg;
+		reg = lower_32_bits(breg);
+		vgic_reg_access(mmio, &reg, offset & 3, mode);
+		if (mmio->is_write && (mode & ACCESS_WRITE_VALUE)) {
+			breg &= GENMASK_ULL(63, 32);
+			breg |= reg;
+			*basereg = breg;
+		}
+		break;
+	case 0x04:
+		breg = *basereg;
+		reg = upper_32_bits(breg);
+		vgic_reg_access(mmio, &reg, offset & 3, mode);
+		if (mmio->is_write && (mode & ACCESS_WRITE_VALUE)) {
+			breg  = lower_32_bits(breg);
+			breg |= (u64)reg << 32;
+			*basereg = breg;
+		}
+		break;
+	}
+}
+
+
+
 bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
 			phys_addr_t offset)
 {
diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
index a093f5c..b2d791c 100644
--- a/virt/kvm/arm/vgic.h
+++ b/virt/kvm/arm/vgic.h
@@ -71,6 +71,10 @@  void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
 		     phys_addr_t offset, int mode);
 bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
 			phys_addr_t offset);
+void vgic_handle_base_register(struct kvm_vcpu *vcpu,
+			       struct kvm_exit_mmio *mmio,
+			       phys_addr_t offset, u64 *basereg,
+			       int mode);
 
 static inline
 u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)