linux-kernel - Re: linux-next: manual merge of the kvm-arm tree with Linus' tree

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Date:   Mon, 10 Apr 2017 01:02:22 -0700
From:   Christoffer Dall <cdall@...columbia.edu>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: manual merge of the kvm-arm tree with Linus' tree

Hi Stephen,

On Mon, Apr 10, 2017 at 02:02:08PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the kvm-arm tree got conflicts in:
> 
>   virt/kvm/arm/vgic/vgic-v2.c
>   virt/kvm/arm/vgic/vgic.h
> 
> between commit:
> 
>   5b0d2cc28058 ("KVM: arm64: Ensure LRs are clear when they should be")
> 
> from Linus' tree and commits:
> 
>   328e56647944 ("KVM: arm/arm64: vgic: Defer touching GICH_VMCR to vcpu_load/put")
>   af0614991ab6 ("KVM: arm/arm64: vgic: Get rid of unnecessary process_maintenance operation")
> 
> from the kvm-arm tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 

Looks good, thanks.
-Christoffer

> 
> diff --cc virt/kvm/arm/vgic/vgic-v2.c
> index b637d9c7afe3,025b57d5787e..000000000000
> --- a/virt/kvm/arm/vgic/vgic-v2.c
> +++ b/virt/kvm/arm/vgic/vgic-v2.c
> @@@ -22,36 -22,7 +22,22 @@@
>   
>   #include "vgic.h"
>   
> - /*
> -  * Call this function to convert a u64 value to an unsigned long * bitmask
> -  * in a way that works on both 32-bit and 64-bit LE and BE platforms.
> -  *
> -  * Warning: Calling this function may modify *val.
> -  */
> - static unsigned long *u64_to_bitmask(u64 *val)
> - {
> - #if defined(CONFIG_CPU_BIG_ENDIAN) && BITS_PER_LONG == 32
> - 	*val = (*val >> 32) | (*val << 32);
> - #endif
> - 	return (unsigned long *)val;
> - }
> - 
>  +static inline void vgic_v2_write_lr(int lr, u32 val)
>  +{
>  +	void __iomem *base = kvm_vgic_global_state.vctrl_base;
>  +
>  +	writel_relaxed(val, base + GICH_LR0 + (lr * 4));
>  +}
>  +
>  +void vgic_v2_init_lrs(void)
>  +{
>  +	int i;
>  +
>  +	for (i = 0; i < kvm_vgic_global_state.nr_lr; i++)
>  +		vgic_v2_write_lr(i, 0);
>  +}
>  +
> - void vgic_v2_process_maintenance(struct kvm_vcpu *vcpu)
> + void vgic_v2_set_underflow(struct kvm_vcpu *vcpu)
>   {
>   	struct vgic_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;
>   
> @@@ -206,10 -160,10 +175,10 @@@ void vgic_v2_set_vmcr(struct kvm_vcpu *
>   		GICH_VMCR_ALIAS_BINPOINT_MASK;
>   	vmcr |= (vmcrp->bpr << GICH_VMCR_BINPOINT_SHIFT) &
>   		GICH_VMCR_BINPOINT_MASK;
>  -	vmcr |= (vmcrp->pmr << GICH_VMCR_PRIMASK_SHIFT) &
>  -		GICH_VMCR_PRIMASK_MASK;
>  +	vmcr |= ((vmcrp->pmr >> GICV_PMR_PRIORITY_SHIFT) <<
>  +		 GICH_VMCR_PRIMASK_SHIFT) & GICH_VMCR_PRIMASK_MASK;
>   
> - 	vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = vmcr;
> + 	cpu_if->vgic_vmcr = vmcr;
>   }
>   
>   void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
> diff --cc virt/kvm/arm/vgic/vgic.h
> index 6cf557e9f718,44445dac0835..000000000000
> --- a/virt/kvm/arm/vgic/vgic.h
> +++ b/virt/kvm/arm/vgic/vgic.h
> @@@ -137,7 -129,8 +136,9 @@@ int vgic_v2_map_resources(struct kvm *k
>   int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
>   			     enum vgic_type);
>   
>  +void vgic_v2_init_lrs(void);
> + void vgic_v2_load(struct kvm_vcpu *vcpu);
> + void vgic_v2_put(struct kvm_vcpu *vcpu);
>   
>   static inline void vgic_get_irq_kref(struct vgic_irq *irq)
>   {