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Thu, 30 Mar 2023 18:46:17 +0100 Date: Thu, 30 Mar 2023 18:46:17 +0100 Message-ID: <86cz4qw2s6.wl-maz@kernel.org> From: Marc Zyngier To: "Veith, Simon" Cc: "kvmarm@lists.linux.dev" , "kvm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "yuzenghui@huawei.com" , "dwmw2@infradead.org" , "coltonlewis@google.com" , "james.morse@arm.com" , "suzuki.poulose@arm.com" , "oliver.upton@linux.dev" , "joey.gouly@arm.com" , "reijiw@google.com" , "ricarkol@google.com" Subject: Re: [PATCH v3 00/18] KVM: arm64: Rework timer offsetting for fun and profit In-Reply-To: <67fd090a26beb831a3ae754853c9419e1cbcfcd8.camel@amazon.de> References: <20230324144704.4193635-1-maz@kernel.org> <67fd090a26beb831a3ae754853c9419e1cbcfcd8.camel@amazon.de> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/28.2 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: sveith@amazon.de, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, yuzenghui@huawei.com, dwmw2@infradead.org, coltonlewis@google.com, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, joey.gouly@arm.com, reijiw@google.com, ricarkol@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230330_104622_041537_5AF0519A X-CRM114-Status: GOOD ( 37.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gV2VkLCAyOSBNYXIgMjAyMyAwNjo0MTowNyArMDEwMCwKIlZlaXRoLCBTaW1vbiIgPHN2ZWl0 aEBhbWF6b24uZGU+IHdyb3RlOgo+IAo+IEhlbGxvIE1hcmMsCj4gCj4gdGhhbmtzIGFnYWluIGZv ciB5b3VyIHByb3Bvc2FsLgo+IAo+IE9uIEZyaSwgMjAyMy0wMy0yNCBhdCAxNDo0NiArMDAwMCwg TWFyYyBaeW5naWVyIHdyb3RlOgo+ID4gVGhpcyBzZXJpZXMgYWltcyBhdCBzYXRpc2Z5aW5nIG11 bHRpcGxlIGdvYWxzOgo+ID4gCj4gPiAtIGFsbG93IGEgVk1NIHRvIGF0b21pY2FsbHkgcmVzdG9y ZSBhIHRpbWVyIG9mZnNldCBmb3IgYSB3aG9sZSBWTQo+ID4gwqAgaW5zdGVhZCBvZiB1cGRhdGlu ZyB0aGUgb2Zmc2V0IGVhY2ggdGltZSBhIHZjcHUgZ2V0IGl0cyBjb3VudGVyCj4gPiDCoCB3cml0 dGVuCj4gPiAKPiA+IC0gYWxsb3cgYSBWTU0gdG8gc2F2ZS9yZXN0b3JlIHRoZSBwaHlzaWNhbCB0 aW1lciBjb250ZXh0LCBzb21ldGhpbmcKPiA+IMKgIHRoYXQgd2UgY2Fubm90IGRvIGF0IHRoZSBt b21lbnQgZHVlIHRvIHRoZSBsYWNrIG9mIG9mZnNldHRpbmcKPiA+IAo+ID4gLSBwcm92aWRlIGEg ZnJhbWV3b3JrIHRoYXQgaXMgc3VpdGFibGUgZm9yIE5WIHN1cHBvcnQsIHdoZXJlIHdlIGdldAo+ ID4gwqAgYm90aCBnbG9iYWwgYW5kIHBlciB0aW1lciwgcGVyIHZjcHUgb2Zmc2V0dGluZywgYW5k IG1hbmFnZQo+ID4gwqAgaW50ZXJydXB0cyBpbiBhIGxlc3MgYnJhaW5kZWFkIHdheS4KPiA+IAo+ ID4gV2UgZml4IGEgY291cGxlIG9mIGlzc3VlcyBhbG9uZyB0aGUgd2F5LCBib3RoIGZyb20gYSBz dHlsaXN0aWMgYW5kCj4gPiBjb3JyZWN0bmVzcyBwZXJzcGVjdGl2ZS4gVGhpcyByZXN1bHRzIGlu IGEgbmV3IHBlciBWTSBLVk0gQVBJIHRoYXQKPiA+IGFsbG93cyBhIGdsb2JhbCBvZmZzZXQgdG8g YmUgc2V0IGF0IGFueSBwb2ludCBpbiB0aW1lLCBvdmVycmlkaW5nCj4gPiBib3RoCj4gPiBvZiB0 aGUgdGltZXIgY291bnRlciB3cml0ZWJhY2tzLgo+ID4gCj4gPiBXZSBhbHNvIHRha2UgdGhpcyBv cHBvcnR1bml0eSB0byByZXdvcmsgdGhlIHdheSBJUlFzIGFyZSBhc3NvY2lhdGVkCj4gPiB3aXRo IHRpbWVycywgc29tZXRoaW5nIHRoYXQgd2FzIGFsd2F5cyBhIGJpdCBkb2RneS4gVGhpcyByZWxp ZXMgb24gYQo+ID4gbmV3IGxvY2ssIHdoaWNoIHNob3VsZCBkaXNhcHBlYXIgb25jZSBPbGl2ZXIn cyBsb2NrIG9yZGVyaW5nIHNlcmllcwo+ID4gaXMKPiA+IG1lcmdlZCAod2UgY2FuIHJldXNlIHRo ZSBjb25maWdfbG9jayBmb3IgdGhpcykuCj4gPiAKPiA+IFRoaXMgaGFzIGJlZW4gdGVzdGVkIHdp dGggblZIRSwgVkhFIGFuZCBOVi4gSSBkbyBub3QgaGF2ZSBhY2Nlc3MgdG8KPiA+IENOVFBPRkYt YXdhcmUgSFcsIGJ1dCBDb2x0b24gbWFuYWdlZCB0byBnaXZlIGl0IGEgZ28uIE5vdGUgdGhhdCB0 aGUKPiA+IE5WIHBhdGNoZXMgaW4gdGhpcyBzZXJpZXMgYXJlIGhlcmUgdG8gZ2l2ZSBhIHBlcnNw ZWN0aXZlIG9uIGhvdyB0aGlzCj4gPiBnZXRzIHVzZWQuCj4gPiAKPiA+IEkndmUgdXBkYXRlZCB0 aGUgYXJjaF90aW1lciBzZWxmdGVzdCB0byBhbGxvdyBhbiBvZmZzZXQgdG8gYmUKPiA+IHByb3Zp ZGVkCj4gPiBmcm9tIHRoZSBjb21tYW5kIGxpbmUsIGFuZCBmaXhlZCBhIGNvdXBsZSBvZiBnbGFy aW5nIGlzc3VlcyBhbG9uZyB0aGUKPiA+IHdheS4KPiA+IAo+ID4gTm90ZSB0aGF0IHRoaXMgaXMg YXQgYmVzdCA2LjQgbWF0ZXJpYWwuIEkgaGF2ZSBhIGJyYW5jaCBzdGFzaGVkIGF0Cj4gPiBbMF0K PiA+IGFuZCBiYXNlZCBvbiA2LjMtcmMzLCBhcyB3ZWxsIGFzIGEgbWluaW1hbCBleGFtcGxlIG9m IHRoZSB1c2Ugb2YgdGhlCj4gPiBBUEkgYXQgWzNdIGJhc2VkIG9uIGt2bXRvb2wuCj4gPiAKPiA+ IFNpbW9uOiBJJ2QgYXBwcmVjaWF0ZSBzb21lIGZlZWRiYWNrIGFzIHdoZXRoZXIgdGhpcyBjaGFu Z2UgZml0cyB5b3VyCj4gPiByZXF1aXJlbWVudHMsIGdpdmVuIHRoYXQgeW91IGJyb3VnaHQgdGhp cyB1cCB0aGUgZmlyc3QgcGxhY2UuCj4gCj4gVGhlIGludGVyZmFjZSBsb29rcyBnb29kIHRvIG1l LiBJIGhhdmUgeWV0IHRvIGRlbGl2ZXIgb24gbXkgcHJvbWlzZSB0bwo+IHRlc3QgeW91ciBwYXRj aCBzZXJpZXMgd2l0aCBvdXIgdXNlcnNwYWNlOyBJIGFtIG9uIGxlYXZlIHRoaXMgd2VlaywgYnV0 Cj4gSSdsbCBnaXZlIHlvdXIgbGF0ZXN0IGl0ZXJhdGlvbiBhIGdvIG5leHQgd2Vlay4KCk5vIHdv cnJpZXMuIEknbSBhYm91dCB0byBwb3N0IHY0LCB3aGljaCBJIHRoaW5rIGlzIHByZXR0eSByaXBl IGF0IHRoaXMKc3RhZ2UuIERvIGxldCBtZSBrbm93IHdoZW4geW91IGdldCBhIGNoYW5jZSB0byB0 cnkgaXQuCgpUaGFua3MsCgoJTS4KCi0tIApXaXRob3V0IGRldmlhdGlvbiBmcm9tIHRoZSBub3Jt LCBwcm9ncmVzcyBpcyBub3QgcG9zc2libGUuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1h cm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcv bWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==