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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id af79cd13be357-910bcf37762sm2298183085a.36.2026.05.20.10.29.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2026 10:29:28 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wPkjX-0000000HXSw-2zB0; Wed, 20 May 2026 14:29:27 -0300 Date: Wed, 20 May 2026 14:29:27 -0300 From: Jason Gunthorpe To: Yu Zhang Cc: Michael Kelley , linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, iommu@lists.linux.dev, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, wei.liu@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, decui@microsoft.com, longli@microsoft.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, bhelgaas@google.com, kwilczynski@kernel.org, lpieralisi@kernel.org, mani@kernel.org, robh@kernel.org, arnd@arndb.de, jacob.pan@linux.microsoft.com, tgopinath@linux.microsoft.com, easwar.hariharan@linux.microsoft.com Subject: Re: [PATCH v1 4/4] iommu/hyperv: Add page-selective IOTLB flush support Message-ID: <20260520172927.GY7702@ziepe.ca> References: <20260511162408.1180069-1-zhangyu1@linux.microsoft.com> <20260511162408.1180069-5-zhangyu1@linux.microsoft.com> <20260515223545.GL7702@ziepe.ca> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, May 21, 2026 at 01:15:24AM +0800, Yu Zhang wrote: > 2) Follow what Intel/AMD drivers do: find a single minimal > 2^N-aligned block that covers the entire range, but may > over-flush. If it is plugged straight into a HW invalidation I would do this.. Jason