From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: <will@kernel.org>, <robin.murphy@arm.com>, <joro@8bytes.org>,
<praan@google.com>, <kevin.tian@intel.com>, <smostafa@google.com>,
<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>, <jamien@nvidia.com>
Subject: Re: [PATCH v9 07/12] iommu/arm-smmu-v3-kexec: Add ASID/VMID reservation helpers
Date: Sat, 22 Aug 2026 13:21:25 -0700 [thread overview]
Message-ID: <aooExTciU6EJTM8J@nvidia.com> (raw)
In-Reply-To: <20260822195954.GN244917@nvidia.com>
On Sat, Aug 22, 2026 at 04:59:54PM -0300, Jason Gunthorpe wrote:
> On Sat, Aug 22, 2026 at 11:51:58AM -0700, Nicolin Chen wrote:
> > On Fri, Aug 21, 2026 at 08:15:26PM -0300, Jason Gunthorpe wrote:
> > > > +/**
> > > > + * arm_smmu_kexec_unresv_ids() - Roll back a failing reservation scan
> > > > + * @smmu: SMMU device of this kernel that failed its reservation scan
> > >
> > > And wouldn't need this either.
> > >
> > > Actually I think this is overkill regardless, just leave the xarray with ASIDs
> > > reserved. Who cares?
> >
> > ASID might be 8-bit that would have limited ASID slots. And it's
> > a quite small step, so I think it might be worth keeping it.
>
> Once you have it per smmu just clear the entire xarray on some
> failure
Yes, there are only two destroy() in the function now.
Nicolin
next prev parent reply other threads:[~2026-08-22 20:21 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-21 19:48 [PATCH v9 00/12] iommu/arm-smmu-v3: Adopt the crashed kernel's stream table for kdump Nicolin Chen
2026-07-21 19:48 ` [PATCH v9 01/12] iommu/arm-smmu-v3: Do not enable EVTQ/PRIQ interrupts in kdump kernel Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-08-22 18:12 ` Nicolin Chen
2026-07-21 19:48 ` [PATCH v9 02/12] iommu/arm-smmu-v3: Skip EVTQ/PRIQ setup " Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-08-22 18:22 ` Nicolin Chen
2026-07-21 19:48 ` [PATCH v9 03/12] iommu/arm-smmu-v3: Add strtab parse helpers to a new arm-smmu-v3-kexec.c Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-07-21 19:48 ` [PATCH v9 04/12] iommu/arm-smmu-v3: Destroy vmid_map ida via devres Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-07-21 19:48 ` [PATCH v9 05/12] iommu/arm-smmu-v3: Add ARM_SMMU_OPT_KDUMP_ADOPT for kdump kernel Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-07-21 19:48 ` [PATCH v9 06/12] iommu/arm-smmu-v3-kexec: Add a CD table parse helper Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-07-21 19:48 ` [PATCH v9 07/12] iommu/arm-smmu-v3-kexec: Add ASID/VMID reservation helpers Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-08-22 2:07 ` Nicolin Chen
2026-08-22 18:51 ` Nicolin Chen
2026-08-22 19:59 ` Jason Gunthorpe
2026-08-22 20:21 ` Nicolin Chen [this message]
2026-07-21 19:48 ` [PATCH v9 08/12] iommu/arm-smmu-v3-kdump: Reserve crashed kernel's ASIDs and VMIDs Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-08-22 18:14 ` Nicolin Chen
2026-07-21 19:48 ` [PATCH v9 09/12] iommu/arm-smmu-v3-kdump: Implement is_attach_deferred() Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-08-22 18:16 ` Nicolin Chen
2026-08-22 20:02 ` Jason Gunthorpe
2026-08-22 20:26 ` Nicolin Chen
2026-08-25 20:08 ` Konstantin Ryabitsev
2026-07-21 21:38 ` [PATCH v9 10/12] iommu/arm-smmu-v3: Retain CR0_SMMUEN during kdump device reset Nicolin Chen
2026-07-21 21:38 ` [PATCH v9 11/12] iommu/arm-smmu-v3: Skip RMR bypass for kdump adoption Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
2026-07-21 21:38 ` [PATCH v9 12/12] iommu/arm-smmu-v3: Detect ARM_SMMU_OPT_KDUMP_ADOPT in probe() Nicolin Chen
2026-08-21 23:15 ` Jason Gunthorpe
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