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authorPierre Morel <pmorel@linux.ibm.com>2020-09-10 11:53:50 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-10-21 17:34:13 +0300
commit4ce1cf7b02ed691acf0d9c664579cb6e52b1687b (patch)
treee920d4aec7686b2a3af4e521600a8c51b2ab6995 /arch/s390/mm/init.c
parent0afa15e1a5294754066343cad24af5ec8edae96d (diff)
downloadlinux-4ce1cf7b02ed691acf0d9c664579cb6e52b1687b.tar.xz
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>
Diffstat (limited to 'arch/s390/mm/init.c')
-rw-r--r--arch/s390/mm/init.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 0d282081dc1f..e27f050cb516 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -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)
{