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[2a00:12d0:af5d:ad01:5d3f:14e6:9bcb:5112]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-672c4d5babcsm2026949a12.23.2026.04.20.05.19.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Apr 2026 05:19:35 -0700 (PDT) Message-ID: Date: Mon, 20 Apr 2026 14:19:34 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC] xen/swiotlb: avoid arch_sync_dma_* on per-device DMA memory To: "Peng Fan (OSS)" , Stefano Stabellini , Oleksandr Tyshchenko Cc: xen-devel@lists.xenproject.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Peng Fan References: <20260415-xen-swiotlb-v1-1-de24eda3c0fd@nxp.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Autocrypt: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== In-Reply-To: <20260415-xen-swiotlb-v1-1-de24eda3c0fd@nxp.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------034tgJUdS8obTrCAMQuKOO5H" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------034tgJUdS8obTrCAMQuKOO5H Content-Type: multipart/mixed; boundary="------------xAm466dmUFDzKs0FzPVhHxO0"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: "Peng Fan (OSS)" , Stefano Stabellini , Oleksandr Tyshchenko Cc: xen-devel@lists.xenproject.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Peng Fan Message-ID: Subject: Re: [PATCH RFC] xen/swiotlb: avoid arch_sync_dma_* on per-device DMA memory References: <20260415-xen-swiotlb-v1-1-de24eda3c0fd@nxp.com> In-Reply-To: <20260415-xen-swiotlb-v1-1-de24eda3c0fd@nxp.com> --------------xAm466dmUFDzKs0FzPVhHxO0 Content-Type: multipart/mixed; boundary="------------y5RAGzWBaBlt2a08ULXbC0V9" --------------y5RAGzWBaBlt2a08ULXbC0V9 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 T24gMTUuMDQuMjYgMTc6MDgsIFBlbmcgRmFuIChPU1MpIHdyb3RlOg0KPiBGcm9tOiBQZW5n IEZhbiA8cGVuZy5mYW5AbnhwLmNvbT4NCj4gDQo+IE9uIEFSTTY0LCBhcmNoX3N5bmNfZG1h X2Zvcl97Y3B1LGRldmljZX0oKSBhc3N1bWVzIHRoYXQgdGhlDQo+IHBoeXNpY2FsIGFkZHJl c3MgcGFzc2VkIGluIHJlZmVycyB0byBub3JtYWwgUkFNIHRoYXQgaXMgcGFydCBvZiB0aGUN Cj4ga2VybmVsIGxpbmVhcihkaXJlY3QpIG1hcHBpbmcsIGFzIGl0IHVuY29uZGl0aW9uYWxs eSBkZXJpdmVzIGEgQ1BVDQo+IHZpcnR1YWwgYWRkcmVzcyB2aWEgcGh5c190b192aXJ0KCku DQo+IA0KPiBXaXRoIFhlbiBzd2lvdGxiLCBkZXZpY2VzIG1heSB1c2UgcGVyLWRldmljZSBj b2hlcmVudCBETUEgbWVtb3J5LA0KPiBzdWNoIGFzIHJlc2VydmVkLW1lbW9yeSByZWdpb25z IGRlc2NyaWJlZCBieSAnc2hhcmVkLWRtYS1wb29sJywNCj4gd2hpY2ggYXJlIGFzc2lnbmVk IHRvIGRldi0+ZG1hX21lbS4gVGhlc2UgcmVnaW9ucyBtYXkgYmUgbWFya2VkDQo+IG5vLW1h cCBpbiBEVCBhbmQgdGhlcmVmb3JlIGFyZSBub3QgcGFydCBvZiB0aGUga2VybmVsIGxpbmVh ciBtYXAuDQo+IEluIHN1Y2ggY2FzZXMsIHBmbl92YWxpZCgpIHN0aWxsIHJldHVybnMgdHJ1 ZSwgYnV0IHBoeXNfdG9fdmlydCgpDQo+IGlzIG5vdCB2YWxpZCBhbmQgY2FjaGUgbWFpbnRl bmFuY2UgdmlhIGFyY2hfc3luY19kbWFfKiB3aWxsIGZhdWx0Lg0KPiANCj4gUHJldmVudCB0 aGlzIGJ5IGV4Y2x1ZGluZyBkZXZpY2VzIHdpdGggYSBwcml2YXRlIERNQSBtZW1vcnkgcG9v bA0KPiAoZGV2LT5kbWFfbWVtKSBmcm9tIHRoZSBhcmNoX3N5bmNfZG1hXyogZmFzdCBwYXRo LCBhbmQgYWx3YXlzDQo+IGZhbGwgYmFjayB0byB4ZW5fZG1hX3N5bmNfKiBmb3IgdGhvc2Ug ZGV2aWNlcyB0byBhdm9pZCBpbnZhbGlkDQo+IHBoeXNfdG9fdmlydCgpIGNvbnZlcnNpb25z IGZvciBuby1tYXAgRE1BIG1lbW9yeSB3aGlsZSBwcmVzZXJ2aW5nIHRoZQ0KPiBleGlzdGlu ZyBmYXN0IHBhdGggZm9yIG5vcm1hbCwgbGluZWFyLW1hcHBlZCBSQU0uDQo+IA0KPiBTaWdu ZWQtb2ZmLWJ5OiBQZW5nIEZhbiA8cGVuZy5mYW5AbnhwLmNvbT4NCj4gLS0tDQo+ICAgZHJp dmVycy94ZW4vc3dpb3RsYi14ZW4uYyB8IDE3ICsrKysrKysrKysrKystLS0tDQo+ICAgMSBm aWxlIGNoYW5nZWQsIDEzIGluc2VydGlvbnMoKyksIDQgZGVsZXRpb25zKC0pDQo+IA0KPiBk aWZmIC0tZ2l0IGEvZHJpdmVycy94ZW4vc3dpb3RsYi14ZW4uYyBiL2RyaXZlcnMveGVuL3N3 aW90bGIteGVuLmMNCj4gaW5kZXggMmNiZjJiNTg4ZjViMjBjZmJmOWU4M2E4MzM5ZGMyMjA5 MmM5NTU5YS4uYjE0NDVkZjk5ZDlhOGYxZDE4YTgzYjhjNDEzYmFkYTZlNTU3OTIwOSAxMDA2 NDQNCj4gLS0tIGEvZHJpdmVycy94ZW4vc3dpb3RsYi14ZW4uYw0KPiArKysgYi9kcml2ZXJz L3hlbi9zd2lvdGxiLXhlbi5jDQo+IEBAIC0xOTUsNiArMTk1LDExIEBAIHhlbl9zd2lvdGxi X2ZyZWVfY29oZXJlbnQoc3RydWN0IGRldmljZSAqZGV2LCBzaXplX3Qgc2l6ZSwgdm9pZCAq dmFkZHIsDQo+ICAgfQ0KPiAgICNlbmRpZiAvKiBDT05GSUdfWDg2ICovDQo+ICAgDQo+ICtz dGF0aWMgaW5saW5lIGJvb2wgZGV2X2hhc19wcml2YXRlX2RtYV9wb29sKHN0cnVjdCBkZXZp Y2UgKmRldikNCj4gK3sNCj4gKwlyZXR1cm4gZGV2ICYmIGRldi0+ZG1hX21lbTsNCj4gK30N Cj4gKw0KDQpJIGRvbid0IHRoaW5rIHRoaXMgd2lsbCBjb21waWxlIG9uIHg4Ni4NCg0KDQpK dWVyZ2VuDQo= --------------y5RAGzWBaBlt2a08ULXbC0V9 Content-Type: application/pgp-keys; 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