[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [RFC XEN PATCH v3 2/3] x86/pvh: Add (un)map_pirq and setup_gsi for PVH dom0
On Mon, Dec 11, 2023 at 12:40:08AM +0800, Jiqian Chen wrote: > If run Xen with PVH dom0 and hvm domU, hvm will map a pirq for > a passthrough device by using gsi, see > xen_pt_realize->xc_physdev_map_pirq and > pci_add_dm_done->xc_physdev_map_pirq. Then xc_physdev_map_pirq > will call into Xen, but in hvm_physdev_op, PHYSDEVOP_map_pirq > is not allowed because currd is PVH dom0 and PVH has no > X86_EMU_USE_PIRQ flag, it will fail at has_pirq check. > So, allow PHYSDEVOP_map_pirq when currd is dom0 no matter if > dom0 has X86_EMU_USE_PIRQ flag and also allow > PHYSDEVOP_unmap_pirq for the failed path to unmap pirq. > > What's more, in PVH dom0, the gsis don't get registered, but > the gsi of a passthrough device must be configured for it to > be able to be mapped into a hvm domU. > So, add PHYSDEVOP_setup_gsi for PVH dom0, because PVH dom0 > will setup gsi during assigning a device to passthrough. > > Co-developed-by: Huang Rui <ray.huang@xxxxxxx> > Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx> > --- > xen/arch/x86/hvm/hypercall.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/xen/arch/x86/hvm/hypercall.c b/xen/arch/x86/hvm/hypercall.c > index 6ad5b4d5f1..621d789bd3 100644 > --- a/xen/arch/x86/hvm/hypercall.c > +++ b/xen/arch/x86/hvm/hypercall.c > @@ -72,8 +72,11 @@ long hvm_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) > arg) > > switch ( cmd ) > { > + case PHYSDEVOP_setup_gsi: I think given the new approach on the Linux side patches, where pciback will configure the interrupt, there's no need to expose setup_gsi anymore? > case PHYSDEVOP_map_pirq: > case PHYSDEVOP_unmap_pirq: > + if ( is_hardware_domain(currd) ) > + break; Also Jan already pointed this out in v2: this hypercall needs to be limited so a PVH dom0 cannot execute it against itself. IOW: refuse the hypercall if DOMID_SELF or the passed domid matches the current domain domid. Thanks, Roger.
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