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[86.49.245.11]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c2ae76a68aasm470794566b.35.2026.09.28.07.31.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Sep 2026 07:31:57 -0700 (PDT) From: Andrew Jones To: iommu@lists.linux.dev, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: tomasz.jeznach@linux.dev, jgg@ziepe.ca, jgg@nvidia.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org, palmer@dabbelt.com, tglx@kernel.org, anup@brainfault.org, atish.patra@linux.dev, fangyu.yu@linux.alibaba.com, zhangzhanpeng.jasper@bytedance.com, zong.li@sifive.com Subject: [RFC PATCH v3 06/14] iommu/riscv: Cache the programmed device context Date: Mon, 28 Sep 2026 16:31:05 +0200 Message-ID: <20260928143113.49838-7-andrew.jones@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260928143113.49838-1-andrew.jones@oss.qualcomm.com> References: <20260928143113.49838-1-andrew.jones@oss.qualcomm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI4MDA1NyBTYWx0ZWRfX2aeJw/gCWTm+ 9WWVK/+VY3geeyfFFfSivsj7snPCA7asjff0bYn8a80ngglAUz6T5YWT0/v8EADWGVwXz/uKU6T Os9f602vrBsp6aV/V5iNN02wzOCn24r8rMtAjo06iDoip+tE7gtPM3kN+rlWWByrHoMGTlc03gv H1+fALzhTNzFA0GqOYNdP5Rkihwg4WJ7QdFVm4q3Lh1VjxciZiGTr38OrQMBkZTUplvWr1B7wHa CZ5FpITABMrqv6qsZQvfo7UdL4wvDVilc3dXkPTb5dMRZhbQ5FVN5LnY52sdhVDbwGNLeO2auzD 5S2kaMABF7NMt7H8KB4IJzDBj65cWNa7bmZShVPw3ZH6R2M4XTS2dbhXuM8j1bead20ufZbp6vA bnOzGvGJQOD7oLvL/HknA+2F6S8Vz1JPgSVP0FvsVDXK0tpeqhLka8LBi9CkF7N85ULMUYyzRIT 8/FM3FMVOkjv4ycS90w== X-Authority-Analysis: v=2.4 cv=V8foQuni c=1 sm=1 tr=0 ts=6aba7a69 cx=c_pps a=DUEm7b3gzWu7BqY5nP7+9g==:117 a=4CXLxsOAgPM/krjtHEZQyA==:17 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=YF9vHHK6WIIsxUIbJtgA:9 a=-aSRE8QhW-JAV6biHavz:22 X-Proofpoint-ORIG-GUID: VNyf0gINAI_ra_UZp9oR-mwkfb554Jm8 X-Proofpoint-GUID: VNyf0gINAI_ra_UZp9oR-mwkfb554Jm8 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI4MDA1NyBTYWx0ZWRfXx3yIeDgJ9afz j3kgEZ0Fr1ISNyPzaceiHY/LxpKx1LCvscaPxr5jq0ctVUe8Ft6dAn90QjvB1ffvhI/yKtHYkps jdjcOnSBe0JaowGgebBpBGTy0mc2GJI= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-28_03,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 impostorscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 suspectscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609280057 Interrupt-remapping state needs to update the MSI fields of an existing device context without rebuilding its translation fields. Keep the software copy in the per-device information. Signed-off-by: Andrew Jones --- drivers/iommu/riscv/iommu.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index 2cee87ffc122..86d5795a12dd 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -872,6 +872,7 @@ PT_IOMMU_CHECK_DOMAIN(struct riscv_iommu_domain, riscvpt.iommu, domain); /* Private IOMMU data for managed devices, dev_iommu_priv_* */ struct riscv_iommu_info { struct riscv_iommu_domain *domain; + struct riscv_iommu_dc dc; unsigned int nr_forwarded_irqs; }; @@ -1513,8 +1514,9 @@ static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain, kfree(bond); return -EBUSY; } + info->dc = dc; riscv_iommu_bond_link(domain, bond); - riscv_iommu_iodir_update(dev, &dc); + riscv_iommu_iodir_update(dev, &info->dc); riscv_iommu_bond_unlink(info->domain, dev); info->domain = domain; riscv_iommu_msi_tables_unlock(old, iommu_domain, flags); @@ -1668,7 +1670,8 @@ static int riscv_iommu_attach_blocking_domain(struct iommu_domain *iommu_domain, /* Make device context invalid, translation requests will fault w/ #258 */ flags = riscv_iommu_msi_tables_lock(old, NULL); - riscv_iommu_iodir_update(dev, &dc); + info->dc = dc; + riscv_iommu_iodir_update(dev, &info->dc); riscv_iommu_bond_unlink(info->domain, dev); info->domain = NULL; riscv_iommu_msi_tables_unlock(old, NULL, flags); @@ -1695,7 +1698,8 @@ static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain, dc.ta = RISCV_IOMMU_PC_TA_V; flags = riscv_iommu_msi_tables_lock(old, NULL); - riscv_iommu_iodir_update(dev, &dc); + info->dc = dc; + riscv_iommu_iodir_update(dev, &info->dc); riscv_iommu_bond_unlink(info->domain, dev); info->domain = NULL; riscv_iommu_msi_tables_unlock(old, NULL, flags); -- 2.43.0