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xen: add helper functions for Xen domain memory management

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Add wrapper functions for Xen memory managment hypercall. They can be
used for unprivilaged Zephyr guest initialization and for domain
management, when Zephyr is used as Xen Domain 0.

Signed-off-by: Dmytro Firsov <dmytro_firsov@epam.com>
This commit is contained in:
Dmytro Firsov 2023-04-27 12:35:25 +03:00 • committed by Fabio Baltieri
commit 3942e3ccff
3 changed files with 135 additions and 0 deletions
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1
drivers/xen/CMakeLists.txt
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@ -4,5 +4,6 @@
zephyr_sources(hvm.c)
zephyr_sources(events.c)
zephyr_sources_ifdef(CONFIG_XEN_GRANT_TABLE gnttab.c)
zephyr_sources(memory.c)
add_subdirectory_ifdef(CONFIG_XEN_DOM0 dom0)

68
drivers/xen/memory.c Normal file
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@ -0,0 +1,68 @@
/* SPDX-License-Identifier: Apache-2.0 */
/*
* Copyright (c) 2023 EPAM Systems
*/
#include <zephyr/arch/arm64/hypercall.h>
#include <zephyr/xen/generic.h>
#include <zephyr/xen/public/memory.h>
#include <zephyr/xen/public/xen.h>
#include <zephyr/kernel.h>
int xendom_add_to_physmap(int domid, unsigned long idx,
unsigned int space, xen_pfn_t gpfn)
{
struct xen_add_to_physmap xatp = {
.domid = domid,
.idx = idx,
.space = space,
.gpfn = gpfn,
};
return HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp);
}
int xendom_add_to_physmap_batch(int domid, int foreign_domid,
unsigned int space, unsigned int size,
xen_ulong_t *idxs, xen_pfn_t *gpfns, int *errs)
{
struct xen_add_to_physmap_batch xatpb = {
.domid = domid,
.u.foreign_domid = foreign_domid,
.space = space,
.size = size,
};
set_xen_guest_handle(xatpb.gpfns, gpfns);
set_xen_guest_handle(xatpb.idxs, idxs);
set_xen_guest_handle(xatpb.errs, errs);
return HYPERVISOR_memory_op(XENMEM_add_to_physmap_batch, &xatpb);
}
int xendom_remove_from_physmap(int domid, xen_pfn_t gpfn)
{
struct xen_remove_from_physmap xrfp = {
.domid = domid,
.gpfn = gpfn,
};
return HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrfp);
}
int xendom_populate_physmap(int domid, unsigned int extent_order,
unsigned int nr_extents, unsigned int mem_flags,
xen_pfn_t *extent_start)
{
struct xen_memory_reservation reservation = {
.domid = domid,
.extent_order = extent_order,
.nr_extents = nr_extents,
.mem_flags = mem_flags,
};
set_xen_guest_handle(reservation.extent_start, extent_start);
return HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
}