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Tue, 30 Jun 2026 02:51:46 -0700 (PDT) Received: from localhost ([64.186.250.142]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30ee326c7a7sm6712247eec.29.2026.06.30.02.51.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jun 2026 02:51:46 -0700 (PDT) Date: Tue, 30 Jun 2026 17:51:43 +0800 From: Chao Liu To: Daniel Henrique Barboza Cc: qemu-devel@nongnu.org, qemu-riscv@nongnu.org, alistair.francis@wdc.com, liwei1518@gmail.com, zhiwei_liu@linux.alibaba.com, andrew.jones@oss.qualcomm.com, Palmer Dabbelt Subject: Re: [PATCH 1/2] hw/riscv/riscv-iommu.c: check for reserved PTE bits Message-ID: References: <20260629121334.567587-1-daniel.barboza@oss.qualcomm.com> <20260629121334.567587-2-daniel.barboza@oss.qualcomm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260629121334.567587-2-daniel.barboza@oss.qualcomm.com> Received-SPF: pass client-ip=2607:f8b0:4864:36::1; envelope-from=chao.liu.zevorn@gmail.com; helo=mail-dy2-x01.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-riscv@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org Sender: qemu-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org On Mon, Jun 29, 2026 at 09:13:33AM +0800, Daniel Henrique Barboza wrote: > We need to fault if reserved PTE bits (60:54) are set. > > Fixes: 0c54acb8243d ("hw/riscv: add RISC-V IOMMU base emulation") > Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3554 > Signed-off-by: Daniel Henrique Barboza Reviewed-by: Chao Liu > --- > hw/riscv/riscv-iommu.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c > index c9687e01a8..453601d7a5 100644 > --- a/hw/riscv/riscv-iommu.c > +++ b/hw/riscv/riscv-iommu.c > @@ -468,6 +468,8 @@ static int riscv_iommu_spa_fetch(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, > > if (!(pte & PTE_V)) { > break; /* Invalid PTE */ > + } else if (pte & PTE_RESERVED(false)) { > + break; /* Reserved PTE bits set */ > } else if (!(pte & (PTE_R | PTE_W | PTE_X))) { > base = PPN_PHYS(ppn); /* Inner PTE, continue walking */ > } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) { > -- > 2.43.0 >