On 2020-07-15 13:51, Michael S. Tsirkin wrote:
On Wed, Jul 15, 2020 at 06:16:59PM +0800, Jason Wang wrote:
On 2020/7/15 下午5:50, Michael S. Tsirkin wrote:
On Wed, Jul 15, 2020 at 10:31:09AM +0200, Pierre Morel wrote:
If protected virtualization is active on s390, the virtio queues are
not accessible to the host, unless VIRTIO_F_IOMMU_PLATFORM has been
negotiated. Use the new arch_validate_virtio_features() interface to
fail probe if that's not the case, preventing a host error on access
attempt.
Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
Acked-by: Halil Pasic <pasic@xxxxxxxxxxxxx>
Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
arch/s390/mm/init.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 6dc7c3b60ef6..d39af6554d4f 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);
@@ -161,6 +162,33 @@ bool force_dma_unencrypted(struct device *dev)
return is_prot_virt_guest();
}
+/*
+ * arch_validate_virtio_features
+ * @dev: the VIRTIO device being added
+ *
+ * Return an error if required features are missing on a guest running
+ * with protected virtualization.
+ */
+int arch_validate_virtio_features(struct virtio_device *dev)
+{
+ if (!is_prot_virt_guest())
+ return 0;
+
+ if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
+ dev_warn(&dev->dev,
+ "legacy virtio not supported with protected virtualization\n");
+ return -ENODEV;
+ }
+
+ if (!virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) {
+ dev_warn(&dev->dev,
+ "support for limited memory access required for protected virtualization\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
/* protected virtualization */
static void pv_init(void)
{
What bothers me here is that arch code depends on virtio now.
It works even with a modular virtio when functions are inline,
but it seems fragile: e.g. it breaks virtio as an out of tree module,
since layout of struct virtio_device can change.
The code was only called from virtio.c so it should be fine.
And my understanding is that we don't need to care about the kABI issue
during upstream development?
Thanks
No, but so far it has been convenient at least for me, for development,
to just be able to unload all of virtio and load a different version.
I'm not sure what to do with this yet, will try to think about it
over the weekend. Thanks!
--
2.25.1
Hi Michael,
I am not sure to understand the problem so I may propose a wrong
solution but, let's try:
Would a callback registration instead of a weak function solve the problem?
The registrating function in core could test a parameter to check if the
callback is in sync with the VIRTIO core.
What do you think?
Regards,
Pierre
--
Pierre Morel
IBM Lab Boeblingen
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