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Date: Tue, 7 Jul 2020 13:12:28 +0200
From: Christian Borntraeger <borntraeger@...ibm.com>
To: Pierre Morel <pmorel@...ux.ibm.com>, linux-kernel@...r.kernel.org
Cc: pasic@...ux.ibm.com, frankja@...ux.ibm.com, mst@...hat.com,
jasowang@...hat.com, cohuck@...hat.com, kvm@...r.kernel.org,
linux-s390@...r.kernel.org,
virtualization@...ts.linux-foundation.org, thomas.lendacky@....com,
david@...son.dropbear.id.au, linuxram@...ibm.com,
heiko.carstens@...ibm.com, gor@...ux.ibm.com
Subject: Re: [PATCH v4 2/2] s390: virtio: PV needs VIRTIO I/O device
protection
On 07.07.20 10:44, Pierre Morel wrote:
> S390, protecting the guest memory against unauthorized host access
> needs to enforce VIRTIO I/O device protection through the use of
> VIRTIO_F_VERSION_1 and VIRTIO_F_IOMMU_PLATFORM.
>
> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
> ---
> arch/s390/kernel/uv.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
> index c296e5c8dbf9..106330f6eda1 100644
> --- a/arch/s390/kernel/uv.c
> +++ b/arch/s390/kernel/uv.c
> @@ -14,6 +14,7 @@
> #include <linux/memblock.h>
> #include <linux/pagemap.h>
> #include <linux/swap.h>
> +#include <linux/virtio_config.h>
> #include <asm/facility.h>
> #include <asm/sections.h>
> #include <asm/uv.h>
> @@ -413,3 +414,27 @@ static int __init uv_info_init(void)
> }
> device_initcall(uv_info_init);
> #endif
> +
> +/*
> + * arch_validate_virtio_iommu_platform
> + * @dev: the VIRTIO device being added
> + *
> + * Return value: returns -ENODEV if any features of the
> + * device breaks the protected virtualization
> + * 0 otherwise.
> + */
> +int arch_validate_virtio_features(struct virtio_device *dev)
> +{
> + if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
> + dev_warn(&dev->dev, "device must provide VIRTIO_F_VERSION_1\n");
I think you only want to warn if is_prot_virt_guest is true? We certainly
want to be able to run as a guest of older hypervisors with virtio 0.95, no?
> + return is_prot_virt_guest() ? -ENODEV : 0;
> + }
> +
> + if (!virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) {
> + dev_warn(&dev->dev,
> + "device must provide VIRTIO_F_IOMMU_PLATFORM\n");
same here.
> + return is_prot_virt_guest() ? -ENODEV : 0;
> + }
> +
> + return 0;
> +}
>
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