On Fri, 6 May 2022, Penny Zheng wrote:
> This commit sets up shared memory foreign mapping for borrower domain.
>
> If owner domain is the default dom_io, all shared domain are treated as
> borrower domain.
>
> Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
> ---
> v2 change:
> - remove guest_physmap_add_shm, since for borrower domain, we only
> do P2M foreign memory mapping now.
> ---
> xen/arch/arm/domain_build.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 089b9e99fc..8d299a3616 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -965,6 +965,16 @@ static int __init process_shm(struct domain *d,
> if ( ret )
> return ret;
> }
> +
> + if ( owner_dom_io || (strcmp(role_str, "borrower") == 0) )
> + {
> + /* Set up P2M foreign mapping for borrower domain. */
> + ret = guest_physmap_add_pages(d, _gfn(PFN_UP(gbase)),
> + _mfn(PFN_UP(pbase)), PFN_DOWN(psize),
> + p2m_map_foreign_rw);
> + if ( ret )
> + return ret;
> + }
> }
>
> return 0;
> --
> 2.25.1
>