Messages in this thread |  | | Date | Thu, 9 Jul 2020 11:55:53 +0200 | From | Halil Pasic <> | Subject | Re: [PATCH v5 2/2] s390: virtio: PV needs VIRTIO I/O device protection |
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On Thu, 9 Jul 2020 10:57:33 +0200 Cornelia Huck <cohuck@redhat.com> wrote:
> On Thu, 9 Jul 2020 10:39:19 +0200 > Pierre Morel <pmorel@linux.ibm.com> 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
Punctuation at the end?
Also 'that's not the case' refers to the negation 'VIRTIO_F_IOMMU_PLATFORM has been negotiated', arch_validate_virtio_features() is however part of virtio_finalize_features(), which is in turn part of the feature negotiation. But that is details. I'm fine with keeping the message as is.
> > > > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> > > --- > > arch/s390/mm/init.c | 27 +++++++++++++++++++++++++++ > > 1 file changed, 27 insertions(+) > > > > diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c > > index 6dc7c3b60ef6..b8e6f90117da 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 +162,32 @@ 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, "device must provide VIRTIO_F_VERSION_1\n"); > > I'd probably use "legacy virtio not supported with protected > virtualization". > > > + return -ENODEV; > > + } > > + > > + if (!virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) { > > + dev_warn(&dev->dev, > > + "device must provide VIRTIO_F_IOMMU_PLATFORM\n"); > > "support for limited memory access required for protected > virtualization" > > ? > > Mentioning the feature flag is shorter in both cases, though.
I liked the messages in v4. Why did we change those? Did somebody complain?
I prefer the old ones, but it any case:
Acked-by: Halil Pasic <pasic@linux.ibm.com>
> > > + return -ENODEV; > > + } > > + > > + return 0; > > +} > > + > > /* protected virtualization */ > > static void pv_init(void) > > { > > Either way, > > Reviewed-by: Cornelia Huck <cohuck@redhat.com> >
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