From: Jason Gunthorpe <jgg@nvidia.com>
To: fangyu.yu@linux.alibaba.com
Cc: gong.shuai@sanechips.com.cn, alex@ghiti.fr,
andrew.jones@oss.qualcomm.com, aou@eecs.berkeley.edu,
gsh517025@gmail.com, guoren@kernel.org, iommu@lists.linux.dev,
joro@8bytes.org, kvm-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
palmer@dabbelt.com, pjw@kernel.org, robin.murphy@arm.com,
tomasz.jeznach@linux.dev, will@kernel.org, zong.li@sifive.com
Subject: Re: [RFC PATCH 1/3] iommu/riscv: Add guest IMSIC GPA mapping helpers
Date: Sun, 11 Oct 2026 10:51:32 -0300 [thread overview]
Message-ID: <20261011135132.GH13920@nvidia.com> (raw)
In-Reply-To: <20261010111837.15424-1-fangyu.yu@linux.alibaba.com>
On Sat, Oct 10, 2026 at 07:18:37PM +0800, fangyu.yu@linux.alibaba.com wrote:
> This is not a generic page-table operation. It is a special
> requirement of RISC-V IOMMU IRQ forwarding (irqbypass) on
> implementations without an MSI page table: the guest IMSIC GPA
> must be mapped into the second-stage domain, and when a vCPU's
> VS-file host page migrates, its leaf must be replaced atomically.
I think you can add an atomic PTE replace operation to generic_pt,
that should be fine.
Jason
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http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@nvidia.com>
To: fangyu.yu@linux.alibaba.com
Cc: gong.shuai@sanechips.com.cn, alex@ghiti.fr,
andrew.jones@oss.qualcomm.com, aou@eecs.berkeley.edu,
gsh517025@gmail.com, guoren@kernel.org, iommu@lists.linux.dev,
joro@8bytes.org, kvm-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
palmer@dabbelt.com, pjw@kernel.org, robin.murphy@arm.com,
tomasz.jeznach@linux.dev, will@kernel.org, zong.li@sifive.com
Subject: Re: [RFC PATCH 1/3] iommu/riscv: Add guest IMSIC GPA mapping helpers
Date: Sun, 11 Oct 2026 10:51:32 -0300 [thread overview]
Message-ID: <20261011135132.GH13920@nvidia.com> (raw)
In-Reply-To: <20261010111837.15424-1-fangyu.yu@linux.alibaba.com>
On Sat, Oct 10, 2026 at 07:18:37PM +0800, fangyu.yu@linux.alibaba.com wrote:
> This is not a generic page-table operation. It is a special
> requirement of RISC-V IOMMU IRQ forwarding (irqbypass) on
> implementations without an MSI page table: the guest IMSIC GPA
> must be mapped into the second-stage domain, and when a vCPU's
> VS-file host page migrates, its leaf must be replaced atomically.
I think you can add an atomic PTE replace operation to generic_pt,
that should be fine.
Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@nvidia.com>
To: fangyu.yu@linux.alibaba.com
Cc: gong.shuai@sanechips.com.cn, alex@ghiti.fr,
andrew.jones@oss.qualcomm.com, aou@eecs.berkeley.edu,
gsh517025@gmail.com, guoren@kernel.org, iommu@lists.linux.dev,
joro@8bytes.org, kvm-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
palmer@dabbelt.com, pjw@kernel.org, robin.murphy@arm.com,
tomasz.jeznach@linux.dev, will@kernel.org, zong.li@sifive.com
Subject: Re: [RFC PATCH 1/3] iommu/riscv: Add guest IMSIC GPA mapping helpers
Date: Sun, 11 Oct 2026 10:51:32 -0300 [thread overview]
Message-ID: <20261011135132.GH13920@nvidia.com> (raw)
In-Reply-To: <20261010111837.15424-1-fangyu.yu@linux.alibaba.com>
On Sat, Oct 10, 2026 at 07:18:37PM +0800, fangyu.yu@linux.alibaba.com wrote:
> This is not a generic page-table operation. It is a special
> requirement of RISC-V IOMMU IRQ forwarding (irqbypass) on
> implementations without an MSI page table: the guest IMSIC GPA
> must be mapped into the second-stage domain, and when a vCPU's
> VS-file host page migrates, its leaf must be replaced atomically.
I think you can add an atomic PTE replace operation to generic_pt,
that should be fine.
Jason
--
kvm-riscv mailing list
kvm-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kvm-riscv
next prev parent reply other threads:[~2026-10-11 13:52 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-08 13:59 [RFC PATCH 0/3] iommu/riscv: Add irqbypass support without MSI page table fangyu.yu
2026-10-08 13:59 ` fangyu.yu
2026-10-08 13:59 ` fangyu.yu
2026-10-08 13:59 ` [RFC PATCH 1/3] iommu/riscv: Add guest IMSIC GPA mapping helpers fangyu.yu
2026-10-08 13:59 ` fangyu.yu
2026-10-08 13:59 ` fangyu.yu
2026-10-09 8:50 ` Gong Shuai
2026-10-09 8:50 ` Gong Shuai
2026-10-09 8:50 ` Gong Shuai
2026-10-10 11:18 ` fangyu.yu
2026-10-10 11:18 ` fangyu.yu
2026-10-10 11:18 ` fangyu.yu
2026-10-10 15:33 ` Gong Shuai
2026-10-10 15:33 ` Gong Shuai
2026-10-10 15:33 ` Gong Shuai
2026-10-11 13:51 ` Jason Gunthorpe [this message]
2026-10-11 13:51 ` Jason Gunthorpe
2026-10-11 13:51 ` Jason Gunthorpe
2026-10-12 9:49 ` fangyu.yu
2026-10-12 9:49 ` fangyu.yu
2026-10-12 9:49 ` fangyu.yu
2026-10-08 14:00 ` [RFC PATCH 2/3] iommu/riscv: Extract IRQ forwarding payload validation fangyu.yu
2026-10-08 14:00 ` fangyu.yu
2026-10-08 14:00 ` fangyu.yu
2026-10-08 14:00 ` [RFC PATCH 3/3] iommu/riscv: Support IRQ forwarding without MSI page tables fangyu.yu
2026-10-08 14:00 ` fangyu.yu
2026-10-08 14:00 ` fangyu.yu
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