On 2020-08-21 13:59, Cornelia Huck wrote:
On Wed, 19 Aug 2020 18:23:17 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:
An architecture may restrict host access to guest memory.
"e.g. IBM s390 Secure Execution or AMD SEV"
Just to make clearer what you are referring to?
yes, thanks
Provide a new Kconfig entry the architecture can select,
CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, when it provides
the arch_has_restricted_virtio_memory_access callback to advertise
s/advertise/advertise to/
OK
VIRTIO common code when the architecture restricts memory access
from the host.
"The common code can then fail the probe for any device where
VIRTIO_F_IOMMU_PLATFORM is required, but not set."
?
Yes, better thanks
Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
drivers/virtio/Kconfig | 6 ++++++
drivers/virtio/virtio.c | 15 +++++++++++++++
include/linux/virtio_config.h | 9 +++++++++
3 files changed, 30 insertions(+)
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 5809e5f5b157..509f3b4d8ba1 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig
@@ -6,6 +6,12 @@ config VIRTIO
bus, such as CONFIG_VIRTIO_PCI, CONFIG_VIRTIO_MMIO, CONFIG_RPMSG
or CONFIG_S390_GUEST.
+config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
+ bool
+ help
+ This option is selected by any architecture enforcing
+ VIRTIO_F_IOMMU_PLATFORM
"This option is selected if the architecture may need to enforce
VIRTIO_F_IOMMU_PLATFORM."
?
yes, better thanks
+
menuconfig VIRTIO_MENU
bool "Virtio drivers"
default y
(...)
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
I will make the rewordings.
Thanks,
Pierre
--
Pierre Morel
IBM Lab Boeblingen
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