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Adding those checks requires that for x86 PVH hardware domain builder the permissions are set before initializing the IOMMU, or else attempts to initialize vPCI done as part of IOMMU device setup will fail due to missing permissions to create the BAR mappings. While moving the call to dom0_setup_permissions() convert the panic() used for error handling to a printk, the caller will already panic if required. Fixes: 9c244fdef7e7 ('vpci: add header handlers') Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich Reviewed-by: Rahul Singh Tested-by: Rahul Singh --- Changes since v1: - Fix printk calls. - Expand commit message. --- I'm unsure whether on ARM MMIO permissions are properly set for the hardware domain, but I don't have a system to test with. --- xen/arch/x86/hvm/dom0_build.c | 21 ++++++++++++++------- xen/drivers/vpci/header.c | 20 ++++++++++++++++++++ 2 files changed, 34 insertions(+), 7 deletions(-) diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c index a7ae9c3b046e..bc0e290db612 100644 --- a/xen/arch/x86/hvm/dom0_build.c +++ b/xen/arch/x86/hvm/dom0_build.c @@ -715,13 +715,6 @@ static int __init pvh_setup_cpus(struct domain *d, pad= dr_t entry, return rc; } =20 - rc =3D dom0_setup_permissions(d); - if ( rc ) - { - panic("Unable to setup Dom0 permissions: %d\n", rc); - return rc; - } - update_domain_wallclock_time(d); =20 v->is_initialised =3D 1; @@ -1184,6 +1177,20 @@ int __init dom0_construct_pvh(struct domain *d, cons= t module_t *image, =20 printk(XENLOG_INFO "*** Building a PVH Dom%d ***\n", d->domain_id); =20 + if ( is_hardware_domain(d) ) + { + /* + * Setup permissions early so that calls to add MMIO regions to the + * p2m as part of vPCI setup don't fail due to permission checks. + */ + rc =3D dom0_setup_permissions(d); + if ( rc ) + { + printk("%pd unable to setup permissions: %d\n", d, rc); + return rc; + } + } + /* * NB: MMCFG initialization needs to be performed before iommu * initialization so the iommu code can fetch the MMCFG regions used b= y the diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index b41556d00746..60f7049e3498 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -17,10 +17,13 @@ * License along with this program; If not, see . */ =20 +#include #include #include #include =20 +#include + #include #include =20 @@ -43,6 +46,23 @@ static int cf_check map_range( { unsigned long size =3D e - s + 1; =20 + if ( !iomem_access_permitted(map->d, s, e) ) + { + printk(XENLOG_G_WARNING + "%pd denied access to MMIO range [%#lx, %#lx]\n", + map->d, s, e); + return -EPERM; + } + + rc =3D xsm_iomem_mapping(XSM_HOOK, map->d, s, e, map->map); + if ( rc ) + { + printk(XENLOG_G_WARNING + "%pd XSM denied access to MMIO range [%#lx, %#lx]: %d\n= ", + map->d, s, e, rc); + return rc; + } + /* * ARM TODOs: * - On ARM whether the memory is prefetchable or not should be pa= ssed --=20 2.41.0