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[Xen-devel] Xen on Seattle

Hi all,

I am running into an issue booting Xen on Seattle platform where dom0 kernel failed to make the following hypercall in arch/arm/xen/enlighten.c: xen_percpu_init().

 HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info)

After investigation, the hypercall failed in the xen/common/domain.c: map_vcpu_info(), where it check

    if ( offset > (PAGE_SIZE - sizeof(vcpu_info_t)) )
        return -EINVAL;


(XEN) DEBUG0: map_vcpu_info: offset = 0x6790
(XEN) DEBUG0: map_vcpu_info: PAGE_SIZE = 0x1000
(XEN) DEBUG0: map_vcpu_info: sizeof(vcpu_info_t) = 0x30

If I understand correctly, it seems that the hypervisor is making assumption that the Dom0 guest is using 4K page size. The PAGE_SHIFT in include/asm-arm/config.h is currently set to 12. So, I have tried changing this to 16 (for 64K page). However, there is a restriction on the 16-bit value of the struct active_grant_entry { length:16; }. So, I cannot boot dom0 with 64K page size. Is this accurate?



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