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s390: virtio: PV needs VIRTIO I/O device protection 

If protected virtualization is active on s390, VIRTIO has only retricted
access to the guest memory.
Define CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS and export
arch_has_restricted_virtio_memory_access to advertize VIRTIO if that's
the case.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Link: https://lore.kernel.org/r/1599728030-17085-3-git-send-email-pmorel@linux.ibm.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Pierre Morel 2020-09-10 10:53:50 +02:00 committed by Michael S. Tsirkin
parent 0afa15e1a5
commit 4ce1cf7b02
2 changed files with 12 additions and 0 deletions
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1
arch/s390/Kconfig
View File

@ -820,6 +820,7 @@ menu "Virtualization"
config PROTECTED_VIRTUALIZATION_GUEST
def_bool n
prompt "Protected virtualization guest support"
select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
help
Select this option, if you want to be able to run this
kernel as a protected virtualization KVM guest.

11
arch/s390/mm/init.c
View File

@ -45,6 +45,7 @@
#include <asm/kasan.h>
#include <asm/dma-mapping.h>
#include <asm/uv.h>
#include <linux/virtio_config.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
@ -160,6 +161,16 @@ bool force_dma_unencrypted(struct device *dev)
return is_prot_virt_guest();
}
#ifdef CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
int arch_has_restricted_virtio_memory_access(void)
{
return is_prot_virt_guest();
}
EXPORT_SYMBOL(arch_has_restricted_virtio_memory_access);
#endif
/* protected virtualization */
static void pv_init(void)
{