Subject: [PATCH v5 1/3] KVM/arm: add hooks for armv7 fp/simd lazy switch support

From: [email-masked] (Mario Smarduch)
Date: Fri, 18 Dec 2015 14:27:42 -0800

On 12/18/2015 5:07 AM, Christoffer Dall wrote:
> On Sun, Dec 06, 2015 at 05:07:12PM -0800, Mario Smarduch wrote:
>> This patch adds vcpu fields to configure hcptr trap register which is also used 
>> to determine if fp/simd registers are dirty. Adds a field to save host FPEXC, 
>> and offsets associated offsets.
> 
> offsets offsets?
Should be 'with vcpu fields'
> 
>>
>> Signed-off-by: Mario Smarduch <[email-masked]>
>> ---
>>  arch/arm/include/asm/kvm_host.h | 6 ++++++
>>  arch/arm/kernel/asm-offsets.c   | 2 ++
>>  2 files changed, 8 insertions(+)
>>
>> diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
>> index 3df1e97..09bb1f2 100644
>> --- a/arch/arm/include/asm/kvm_host.h
>> +++ b/arch/arm/include/asm/kvm_host.h
>> @@ -104,6 +104,12 @@ struct kvm_vcpu_arch {
>>  	/* HYP trapping configuration */
>>  	u32 hcr;
>>  
>> +	/* HYP Co-processor fp/simd and trace trapping configuration */
>> +	u32 hcptr;
>> +
>> +	/* Save host FPEXC register to later restore on vcpu put */
>> +	u32 host_fpexc;
>> +
>>  	/* Interrupt related fields */
>>  	u32 irq_lines;		/* IRQ and FIQ levels */
>>  
>> diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
>> index 871b826..28ebd4c 100644
>> --- a/arch/arm/kernel/asm-offsets.c
>> +++ b/arch/arm/kernel/asm-offsets.c
>> @@ -185,6 +185,8 @@ int main(void)
>>    DEFINE(VCPU_PC,		offsetof(struct kvm_vcpu, arch.regs.usr_regs.ARM_pc));
>>    DEFINE(VCPU_CPSR,		offsetof(struct kvm_vcpu, arch.regs.usr_regs.ARM_cpsr));
>>    DEFINE(VCPU_HCR,		offsetof(struct kvm_vcpu, arch.hcr));
>> +  DEFINE(VCPU_HCPTR,		offsetof(struct kvm_vcpu, arch.hcptr));
>> +  DEFINE(VCPU_VFP_HOST_FPEXC,	offsetof(struct kvm_vcpu, arch.host_fpexc));
> 
> this makes me think this needs a good rebase on world-switch in C, which
> is now in kvmarm/next...
Ok, definitely.
> 
>>    DEFINE(VCPU_IRQ_LINES,	offsetof(struct kvm_vcpu, arch.irq_lines));
>>    DEFINE(VCPU_HSR,		offsetof(struct kvm_vcpu, arch.fault.hsr));
>>    DEFINE(VCPU_HxFAR,		offsetof(struct kvm_vcpu, arch.fault.hxfar));
> 
> this patch is hard to review on its own as I don't see how this is used,
> but ok...
Sure, I'll combine it.
>> -- 
>> 1.9.1