On 10/2/25 06:10, Andrew Cooper wrote: > On 01/10/2025 9:01 pm, Milan Djokic wrote: >> Signed-off-by: Milan Djokic <[email protected]> >> >> --- >> XEN_DOMCTL_get_address_size hypercall is not implemented for arm (only for >> x86) >> It would be useful to have this hypercall supported for arm64, in order to >> get >> current guest addressing mode and also to verify that >> XEN_DOMCTL_set_address_size >> performs switch to target addressing mode (instead of relying on its >> returned error code only). > > Please don't copy this misfeature of x86 PV guests into ARM. > > Letting domains be of variable bitness after domain create leads to a > whole lot of bugs, many security relevant. > > 32bit vs 64bit should be an input to domain_create(), not something that > is edited after the domain has been constructed.
Does this mean that Xen guests cannot support multiarch? -- Sincerely, Demi Marie Obenour (she/her/hers)
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