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Re: [XEN PATCH v5 1/3] x86/iommu: Disable IOMMU if cx16 isn't supported
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 24 Apr 2024 16:33:49 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 24 Apr 2024 14:33:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.04.2024 13:57, Teddy Astie wrote:
> --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
> +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
> @@ -305,6 +305,12 @@ static int __init cf_check iov_detect(void)
> if ( !iommu_enable && !iommu_intremap )
> return 0;
>
> + if ( unlikely(!cpu_has_cx16) )
> + {
> + printk("AMD-Vi: CPU doesn't support CMPXCHG16B, disabling\n");
> + return -ENODEV;
> + }
One additional nit: Here you neatly have just AMD-Vi: as a prefix for the
log message. Why ...
> @@ -2630,6 +2598,15 @@ static int __init cf_check vtd_setup(void)
> int ret;
> bool reg_inval_supported = true;
>
> + if ( unlikely(!cpu_has_cx16) )
> + {
> + printk(XENLOG_ERR VTDPREFIX
> + "IOMMU: CPU doesn't support CMPXCHG16B, disabling\n");
> +
> + ret = -ENODEV;
> + goto error;
> + }
... both VTDPREFIX and "IOMMU:" here?
Jan
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