vhost: disable for OABI

vhost is currently broken on the some ARM configs.

The reason is that the ring element addresses are passed between
components with different alignments assumptions. Thus, if
guest selects a pointer and host then gets and dereferences
it, then alignment assumed by the host's compiler might be
greater than the actual alignment of the pointer.
compiler on the host from assuming pointer is aligned.

This actually triggers on ARM with -mabi=apcs-gnu - which is a
deprecated configuration. With this OABI, compiler assumes that
all structures are 4 byte aligned - which is stronger than
virtio guarantees for available and used rings, which are
merely 2 bytes. Thus a guest without -mabi=apcs-gnu running
on top of host with -mabi=apcs-gnu will be broken.

The correct fix is to force alignment of structures - however
that is an intrusive fix that's best deferred until the next release.

We didn't previously support such ancient systems at all - this surfaced
after vdpa support prompted removing dependency of vhost on
VIRTULIZATION. So for now, let's just add something along the lines of

	depends on !ARM || AEABI

to the virtio Kconfig declaration, and add a comment that it has to do
with struct member alignment.

Note: we can't make VHOST and VHOST_RING themselves have
a dependency since these are selected. Add a new symbol for that.

We should be able to drop this dependency down the road.

Fixes: 20c384f1ea1a0bc7 ("vhost: refine vhost and vringh kconfig")
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Suggested-by: Richard Earnshaw <Richard.Earnshaw@arm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig
index 8f201d0..3bfe72c 100644 (file)
--- a/drivers/misc/mic/Kconfig
+++ b/drivers/misc/mic/Kconfig
@@ -116,7 +116,7 @@ config MIC_COSM
 
 config VOP
        tristate "VOP Driver"
-       depends on VOP_BUS
+       depends on VOP_BUS && VHOST_DPN
        select VHOST_RING
        select VIRTIO
        help

diff --git a/drivers/net/caif/Kconfig b/drivers/net/caif/Kconfig
index 9db0570..661c25e 100644 (file)
--- a/drivers/net/caif/Kconfig
+++ b/drivers/net/caif/Kconfig
@@ -50,7 +50,7 @@ config CAIF_HSI
 
 config CAIF_VIRTIO
        tristate "CAIF virtio transport driver"
-       depends on CAIF && HAS_DMA
+       depends on CAIF && HAS_DMA && VHOST_DPN
        select VHOST_RING
        select VIRTIO
        select GENERIC_ALLOCATOR

diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
index 3e1ceb8..e814006 100644 (file)
--- a/drivers/vdpa/Kconfig
+++ b/drivers/vdpa/Kconfig
@@ -10,7 +10,7 @@ if VDPA
 
 config VDPA_SIM
        tristate "vDPA device simulator"
-       depends on RUNTIME_TESTING_MENU && HAS_DMA
+       depends on RUNTIME_TESTING_MENU && HAS_DMA && VHOST_DPN
        select VHOST_RING
        default n
        help

diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
index 2c75d16..c4f2737 100644 (file)
--- a/drivers/vhost/Kconfig
+++ b/drivers/vhost/Kconfig
@@ -13,6 +13,15 @@ config VHOST_RING
          This option is selected by any driver which needs to access
          the host side of a virtio ring.
 
+config VHOST_DPN
+       bool
+       depends on !ARM || AEABI
+       default y
+       help
+         Anything selecting VHOST or VHOST_RING must depend on VHOST_DPN.
+         This excludes the deprecated ARM ABI since that forces a 4 byte
+         alignment on all structs - incompatible with virtio spec requirements.
+
 config VHOST
        tristate
        select VHOST_IOTLB
@@ -28,7 +37,7 @@ if VHOST_MENU
 
 config VHOST_NET
        tristate "Host kernel accelerator for virtio net"
-       depends on NET && EVENTFD && (TUN || !TUN) && (TAP || !TAP)
+       depends on NET && EVENTFD && (TUN || !TUN) && (TAP || !TAP) && VHOST_DPN
        select VHOST
        ---help---
          This kernel module can be loaded in host kernel to accelerate
@@ -40,7 +49,7 @@ config VHOST_NET
 
 config VHOST_SCSI
        tristate "VHOST_SCSI TCM fabric driver"
-       depends on TARGET_CORE && EVENTFD
+       depends on TARGET_CORE && EVENTFD && VHOST_DPN
        select VHOST
        default n
        ---help---
@@ -49,7 +58,7 @@ config VHOST_SCSI
 
 config VHOST_VSOCK
        tristate "vhost virtio-vsock driver"
-       depends on VSOCKETS && EVENTFD
+       depends on VSOCKETS && EVENTFD && VHOST_DPN
        select VHOST
        select VIRTIO_VSOCKETS_COMMON
        default n
@@ -63,7 +72,7 @@ config VHOST_VSOCK
 
 config VHOST_VDPA
        tristate "Vhost driver for vDPA-based backend"
-       depends on EVENTFD
+       depends on EVENTFD && VHOST_DPN
        select VHOST
        depends on VDPA
        help