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Re: [PATCH v3 8/8] xen/dom0less: store xenstore event channel in page
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 27 Aug 2025 09:58:30 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 27 Aug 2025 07:58:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.08.2025 23:08, Jason Andryuk wrote:
> --- a/xen/common/device-tree/dom0less-build.c
> +++ b/xen/common/device-tree/dom0less-build.c
> @@ -26,6 +26,7 @@
> #include <public/event_channel.h>
> #include <public/io/xs_wire.h>
>
> +#include <asm/guest_access.h>
> #include <asm/setup.h>
>
> #include <xen/static-memory.h>
> @@ -120,8 +121,14 @@ static void __init initialize_domU_xenstore(void)
>
> if ( gfn != XENSTORE_PFN_LATE_ALLOC &&
> IS_ENABLED(CONFIG_GRANT_TABLE) )
> {
> + evtchn_port_t port = d->arch.hvm.params[HVM_PARAM_STORE_EVTCHN];
> + paddr_t evtchn_gaddr = gfn_to_gaddr(_gfn(gfn)) +
> + offsetof(struct xenstore_domain_interface, evtchn_port);
> +
> ASSERT(gfn < UINT32_MAX);
> gnttab_seed_entry(d, GNTTAB_RESERVED_XENSTORE, xs_domid, gfn);
> + access_guest_memory_by_gpa(d, evtchn_gaddr, &port, sizeof(port),
> + true /* is_write */);
Isn't the use of an arch-specific function going to pose yet another issue
for making this code usable on x86? Can't you use copy_to_guest_phys() here?
Which may in turn need to be passed in by the caller, see e.g. dtb_load()
and initrd_load() (i.e. cache flushing may also be necessary for Arm).
Jan
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