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

From: [email-masked] (Christoffer Dall)
Date: Fri, 18 Dec 2015 14:07:41 +0100

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?

> 
> 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...

>    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...

> -- 
> 1.9.1