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From: Alexandru Elisei <alexandru.elisei@arm.com>
To: Eric Auger <eric.auger@redhat.com>,
	eric.auger.pro@gmail.com, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	maz@kernel.org, drjones@redhat.com
Cc: shuah@kernel.org, pbonzini@redhat.com
Subject: Re: [PATCH 7/9] KVM: arm64: Simplify argument passing to vgic_uaccess_[read|write]
Date: Tue, 12 Jan 2021 16:16:40 +0000	[thread overview]
Message-ID: <e7af1e23-7b08-99d6-d78c-812d442b32ce@arm.com> (raw)
In-Reply-To: <ee2ec95e-4262-a364-b037-c43f3d396760@arm.com>

Hi Eric,

On 1/12/21 4:04 PM, Alexandru Elisei wrote:
> Hi Eric,
>
> On 12/12/20 6:50 PM, Eric Auger wrote:
>> Instead of converting the vgic_io_device handle to a kvm_io_device
>> handled and then do the oppositive, pass a vgic_io_device pointer all
>> along the call chain.
> To me, it looks like the commit message describes what the patch does instead of
> why it does it.
>
> What are "vgic_io_device handle" and "kvm_io_device handled"?

Sorry, I think I got it now. You were referring to the argument types struct
vgic_io_device and struct kvm_io_device. The patch looks like a very good cleanup.

How changing to commit message to sound something like this (feel free to
ignore/change it if you think of something else):

vgic_uaccess() takes a struct vgic_io_device argument, converts it to a struct
kvm_io_device and passes it to the read/write accessor functions, which convert it
back to a struct vgic_io_device. Avoid the indirection by passing the struct
vgic_io_device argument directly to vgic_uaccess_{read,write).

Thanks,
Alex
>
> Thanks,
> Alex
>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>> ---
>>  arch/arm64/kvm/vgic/vgic-mmio.c | 10 ++++------
>>  1 file changed, 4 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/arm64/kvm/vgic/vgic-mmio.c b/arch/arm64/kvm/vgic/vgic-mmio.c
>> index b2d73fc0d1ef..48c6067fc5ec 100644
>> --- a/arch/arm64/kvm/vgic/vgic-mmio.c
>> +++ b/arch/arm64/kvm/vgic/vgic-mmio.c
>> @@ -938,10 +938,9 @@ vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
>>  	return region;
>>  }
>>  
>> -static int vgic_uaccess_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
>> +static int vgic_uaccess_read(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
>>  			     gpa_t addr, u32 *val)
>>  {
>> -	struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
>>  	const struct vgic_register_region *region;
>>  	struct kvm_vcpu *r_vcpu;
>>  
>> @@ -960,10 +959,9 @@ static int vgic_uaccess_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
>>  	return 0;
>>  }
>>  
>> -static int vgic_uaccess_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
>> +static int vgic_uaccess_write(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
>>  			      gpa_t addr, const u32 *val)
>>  {
>> -	struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
>>  	const struct vgic_register_region *region;
>>  	struct kvm_vcpu *r_vcpu;
>>  
>> @@ -986,9 +984,9 @@ int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev,
>>  		 bool is_write, int offset, u32 *val)
>>  {
>>  	if (is_write)
>> -		return vgic_uaccess_write(vcpu, &dev->dev, offset, val);
>> +		return vgic_uaccess_write(vcpu, dev, offset, val);
>>  	else
>> -		return vgic_uaccess_read(vcpu, &dev->dev, offset, val);
>> +		return vgic_uaccess_read(vcpu, dev, offset, val);
>>  }
>>  
>>  static int dispatch_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
> _______________________________________________
> kvmarm mailing list
> kvmarm@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

  reply	other threads:[~2021-01-12 16:19 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-12 18:50 [PATCH 0/9] KVM/ARM: Some vgic fixes and init sequence KVM selftests Eric Auger
2020-12-12 18:50 ` [PATCH 1/9] KVM: arm64: vgic-v3: Fix some error codes when setting RDIST base Eric Auger
2021-01-06 16:32   ` Alexandru Elisei
2021-01-14 10:02     ` Auger Eric
2020-12-12 18:50 ` [PATCH 2/9] KVM: arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION read Eric Auger
2021-01-06 17:12   ` Alexandru Elisei
2021-01-13 17:18     ` Auger Eric
2020-12-12 18:50 ` [PATCH 3/9] KVM: arm64: vgic-v3: Fix error handling in vgic_v3_set_redist_base() Eric Auger
2020-12-28 15:35   ` Marc Zyngier
2021-01-13 17:18     ` Auger Eric
2020-12-12 18:50 ` [PATCH 4/9] KVM: arm/arm64: vgic: Reset base address on kvm_vgic_dist_destroy() Eric Auger
2020-12-28 15:41   ` Marc Zyngier
2021-01-13 17:18     ` Auger Eric
2020-12-12 18:50 ` [PATCH 5/9] KVM: arm: move has_run_once after the map_resources Eric Auger
2021-01-12 14:55   ` Alexandru Elisei
2021-01-14 10:02     ` Auger Eric
2021-01-20 15:56       ` Alexandru Elisei
2021-03-12 17:27         ` Auger Eric
2020-12-12 18:50 ` [PATCH 6/9] docs: kvm: devices/arm-vgic-v3: enhance KVM_DEV_ARM_VGIC_CTRL_INIT doc Eric Auger
2021-01-12 15:39   ` Alexandru Elisei
2021-01-13 17:18     ` Auger Eric
2020-12-12 18:50 ` [PATCH 7/9] KVM: arm64: Simplify argument passing to vgic_uaccess_[read|write] Eric Auger
2021-01-12 16:04   ` Alexandru Elisei
2021-01-12 16:16     ` Alexandru Elisei [this message]
2021-01-13 17:18       ` Auger Eric
2020-12-12 18:50 ` [PATCH 8/9] KVM: arm64: vgic-v3: Expose GICR_TYPER.Last for userspace Eric Auger
2021-01-12 17:02   ` Alexandru Elisei
2021-01-14 10:16     ` Auger Eric
2021-01-20 16:13       ` Alexandru Elisei
2021-03-12 17:26         ` Auger Eric
2021-01-12 17:28   ` Alexandru Elisei
2021-01-12 17:48     ` Marc Zyngier
2020-12-12 18:50 ` [PATCH 9/9] KVM: selftests: aarch64/vgic-v3 init sequence tests Eric Auger

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