On 2020-08-21 13:59, Cornelia Huck wrote:
On Wed, 19 Aug 2020 18:23:17 +0200
Pierre Morel <pmo...@linux.ibm.com> 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 <pmo...@linux.ibm.com>
---
  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 <coh...@redhat.com>


I will make the rewordings.

Thanks,
Pierre

--
Pierre Morel
IBM Lab Boeblingen
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