On Fri, 13 Nov 2015, Julien Grall wrote: > Hi Stefano, > > On 12/11/15 17:30, Stefano Stabellini wrote: > > Signed-off-by: Stefano Stabellini <stefano.stabell...@eu.citrix.com> > > > > --- > > > > Changes in v2: > > - rename dom0_op to platform_op > > --- > > arch/arm/include/asm/xen/hypercall.h | 2 ++ > > arch/arm/xen/enlighten.c | 1 + > > arch/arm/xen/hypercall.S | 1 + > > arch/arm64/xen/hypercall.S | 1 + > > 4 files changed, 5 insertions(+) > > > > diff --git a/arch/arm/include/asm/xen/hypercall.h > > b/arch/arm/include/asm/xen/hypercall.h > > index 712b50e..c3e00d0 100644 > > --- a/arch/arm/include/asm/xen/hypercall.h > > +++ b/arch/arm/include/asm/xen/hypercall.h > > @@ -35,6 +35,7 @@ > > > > #include <xen/interface/xen.h> > > #include <xen/interface/sched.h> > > +#include <xen/interface/platform.h> > > > > long privcmd_call(unsigned call, unsigned long a1, > > unsigned long a2, unsigned long a3, > > @@ -49,6 +50,7 @@ int HYPERVISOR_memory_op(unsigned int cmd, void *arg); > > int HYPERVISOR_physdev_op(int cmd, void *arg); > > int HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args); > > int HYPERVISOR_tmem_op(void *arg); > > +int HYPERVISOR_platform_op(void *arg); > > int HYPERVISOR_platform_op(struct xen_platform_op *platform_op) to allow > compiler type checking and match the x86 version.
Yeah, I am just following the same pattern as the others > Also, the implementation of the helper differ from x86. On x86, the > helper takes care of setting the interface_version while here you > request the caller to do it. > > It's better if we have similar requirement across the architecture as > this helpers may be called from common code. I agree with your point (I thought about it myself) but the current assembly scheme for hypercalls doesn't work well with that. I would have to introduce, and maintain going forward, two special hypercall implementations in assembly, one for arm and another for arm64, just to set interface_version. I don't think it is worth it; I prefer to have to maintain the explicit interface_version setting at the call sites (that today is just one). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/