On 27/03/18 10:07, Manish Jaggi wrote:
> This patch is ported from linux to xen
> commit: 2724c11a1df4b22ee966c04809ea0e808f66b04e
> (KVM: arm64: vgic-v3: Add ICV_HPPIR1_EL1 handler)
>
> Add a handler for reading the guest's view of the ICV_HPPIR1_EL1
> register. This is a simple parsing of the available LRs, extracting the
> highest available interrupt.
>
> Signed-off-by: Manish Jaggi <manish.ja...@cavium.com>
> ---
> xen/arch/arm/arm64/vgic-v3-sr.c | 31 +++++++++++++++++++++++++++++++
> xen/include/asm-arm/arm64/sysregs.h | 1 +
> 2 files changed, 32 insertions(+)
>
> diff --git a/xen/arch/arm/arm64/vgic-v3-sr.c b/xen/arch/arm/arm64/vgic-v3-sr.c
> index c67e7c6ada..f11c7646da 100644
> --- a/xen/arch/arm/arm64/vgic-v3-sr.c
> +++ b/xen/arch/arm/arm64/vgic-v3-sr.c
> @@ -674,6 +674,33 @@ static void vreg_emulate_apxr3(struct cpu_user_regs
> *regs,
> vgic_v3_write_apxrn(regs, hsr, 3);
> }
>
> +static void vgic_v3_read_hppir1(struct cpu_user_regs *regs,
> + const union hsr hsr)
> +{
> + uint64_t lr_val;
> + int lr, lr_grp, grp;
> + uint32_t vmcr = READ_SYSREG32(ICH_VMCR_EL2);
> +
> + grp = vgic_v3_get_group(hsr);
> + lr = vgic_v3_highest_priority_lr(regs, vmcr, &lr_val);
> +
> + if ( lr == -1 )
> + goto spurious;
> +
> + lr_grp = !!(lr_val & ICH_LR_GROUP);
> + if ( lr_grp != grp )
> + lr_val = ICC_IAR1_EL1_SPURIOUS;
> +
> +spurious:
> + set_user_reg(regs, hsr.sysreg.reg, lr_val & ICH_LR_VIRTUAL_ID_MASK);
> +}
> +
> +static void vreg_emulate_hppir1(struct cpu_user_regs *regs,
> + const union hsr hsr)
> +{
> + vgic_v3_read_hppir1(regs, hsr);
> +}
See why I said that this "emulate" function idea didn't hold much water?
M.
--
Jazz is not dead. It just smells funny...
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
