On Fri, Jan 24, 2025 at 04:30:43PM -0800, Nicolin Chen wrote:
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
> b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
> index ceeed907a714..20a0e39d7caa 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
> +++ b/dri
On Tue, Feb 18, 2025 at 02:52:29PM -0400, Jason Gunthorpe wrote:
> On Tue, Feb 18, 2025 at 06:17:15PM +, Pranjal Shrivastava wrote:
>
> > > Is MEV available only in nested mode? Otherwise it perhaps makes
> > > sense to turn it on in all configurations in IOMMUFD paths...
> >
> > I think the
On Tue, Feb 18, 2025 at 06:17:15PM +, Pranjal Shrivastava wrote:
> On Tue, Feb 18, 2025 at 05:24:08AM +, Tian, Kevin wrote:
> > > From: Nicolin Chen
> > > Sent: Saturday, January 25, 2025 8:31 AM
> > >
> > > There is a DoS concern on the shared hardware event queue among devices
> > > pas
On Tue, Feb 18, 2025 at 06:17:15PM +, Pranjal Shrivastava wrote:
> > Is MEV available only in nested mode? Otherwise it perhaps makes
> > sense to turn it on in all configurations in IOMMUFD paths...
>
> I think the arm-smmu-v3's iommufd implementation only supports nested
> which could be th
On Tue, Feb 18, 2025 at 05:24:08AM +, Tian, Kevin wrote:
> > From: Nicolin Chen
> > Sent: Saturday, January 25, 2025 8:31 AM
> >
> > There is a DoS concern on the shared hardware event queue among devices
> > passed through to VMs, that too many translation failures that belong to
> > VMs cou
On Tue, Feb 18, 2025 at 01:21:20PM -0400, Jason Gunthorpe wrote:
> On Fri, Jan 24, 2025 at 04:30:43PM -0800, Nicolin Chen wrote:
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > @@ -1051,7 +1051,7 @@ void arm_smmu_get_ste_used(const __l
On Fri, Jan 24, 2025 at 04:30:43PM -0800, Nicolin Chen wrote:
> There is a DoS concern on the shared hardware event queue among devices
> passed through to VMs, that too many translation failures that belong to
> VMs could overflow the shared hardware event queue if those VMs or their
> VMMs don't
> From: Nicolin Chen
> Sent: Saturday, January 25, 2025 8:31 AM
>
> There is a DoS concern on the shared hardware event queue among devices
> passed through to VMs, that too many translation failures that belong to
> VMs could overflow the shared hardware event queue if those VMs or their
> VMMs
There is a DoS concern on the shared hardware event queue among devices
passed through to VMs, that too many translation failures that belong to
VMs could overflow the shared hardware event queue if those VMs or their
VMMs don't handle/recover the devices properly.
The MEV bit in the STE allows to
