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From: Oliver Upton To: James Houghton Cc: Andrew Morton , Paolo Bonzini , Albert Ou , Ankit Agrawal , Anup Patel , Atish Patra , Axel Rasmussen , Bibo Mao , Catalin Marinas , David Matlack , David Rientjes , Huacai Chen , James Morse , Jonathan Corbet , Marc Zyngier , Michael Ellerman , Nicholas Piggin , Palmer Dabbelt , Paul Walmsley , Raghavendra Rao Ananta , Ryan Roberts , Sean Christopherson , Shaoqin Huang , Shuah Khan , Suzuki K Poulose , Tianrui Zhao , Will Deacon , Yu Zhao , Zenghui Yu , kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev Subject: Re: [PATCH v4 6/7] KVM: arm64: Relax locking for kvm_test_age_gfn and kvm_age_gfn Message-ID: References: <20240529180510.2295118-1-jthoughton@google.com> <20240529180510.2295118-7-jthoughton@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240604_160043_325462_59B5F64C X-CRM114-Status: GOOD ( 29.25 ) 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 T24gVHVlLCBKdW4gMDQsIDIwMjQgYXQgMDM6MjA6MjBQTSAtMDcwMCwgSmFtZXMgSG91Z2h0b24g d3JvdGU6Cj4gT24gRnJpLCBNYXkgMzEsIDIwMjQgYXQgMTI6MTjigK9QTSBPbGl2ZXIgVXB0b24g PG9saXZlci51cHRvbkBsaW51eC5kZXY+IHdyb3RlOgo+ID4KPiA+IE9uIEZyaSwgTWF5IDMxLCAy MDI0IGF0IDEyOjExOjMzUE0gLTA3MDAsIE9saXZlciBVcHRvbiB3cm90ZToKPiA+ID4gT24gV2Vk LCBNYXkgMjksIDIwMjQgYXQgMDY6MDU6MDlQTSArMDAwMCwgSmFtZXMgSG91Z2h0b24gd3JvdGU6 Cj4gPiA+Cj4gPiA+IFsuLi5dCj4gPiA+Cj4gPiA+ID4gZGlmZiAtLWdpdCBhL2FyY2gvYXJtNjQv a3ZtL2h5cC9wZ3RhYmxlLmMgYi9hcmNoL2FybTY0L2t2bS9oeXAvcGd0YWJsZS5jCj4gPiA+ID4g aW5kZXggOWUyYmJlZTc3NDkxLi5lYWJiMDdjNjZhMDcgMTAwNjQ0Cj4gPiA+ID4gLS0tIGEvYXJj aC9hcm02NC9rdm0vaHlwL3BndGFibGUuYwo+ID4gPiA+ICsrKyBiL2FyY2gvYXJtNjQva3ZtL2h5 cC9wZ3RhYmxlLmMKPiA+ID4gPiBAQCAtMTMxOSwxMCArMTMxOSw4IEBAIHN0YXRpYyBpbnQgc3Rh Z2UyX2FnZV93YWxrZXIoY29uc3Qgc3RydWN0IGt2bV9wZ3RhYmxlX3Zpc2l0X2N0eCAqY3R4LAo+ ID4gPiA+ICAgICBkYXRhLT55b3VuZyA9IHRydWU7Cj4gPiA+ID4KPiA+ID4gPiAgICAgLyoKPiA+ ID4gPiAtICAgICogc3RhZ2UyX2FnZV93YWxrZXIoKSBpcyBhbHdheXMgY2FsbGVkIHdoaWxlIGhv bGRpbmcgdGhlIE1NVSBsb2NrIGZvcgo+ID4gPiA+IC0gICAgKiB3cml0ZSwgc28gdGhpcyB3aWxs IGFsd2F5cyBzdWNjZWVkLiBOb25ldGhlbGVzcywgdGhpcyBkZWxpYmVyYXRlbHkKPiA+ID4gPiAt ICAgICogZm9sbG93cyB0aGUgcmFjZSBkZXRlY3Rpb24gcGF0dGVybiBvZiB0aGUgb3RoZXIgc3Rh Z2UtMiB3YWxrZXJzIGluCj4gPiA+ID4gLSAgICAqIGNhc2UgdGhlIGxvY2tpbmcgbWVjaGFuaWNz IG9mIHRoZSBNTVUgbm90aWZpZXJzIGlzIGV2ZXIgY2hhbmdlZC4KPiA+ID4gPiArICAgICogVGhp cyB3YWxrIG1heSBub3QgYmUgZXhjbHVzaXZlOyB0aGUgUFRFIGlzIHBlcm1pdHRlZCB0byBjaGFu Z2UKPiA+ID4gPiArICAgICogZnJvbSB1bmRlciB1cy4KPiA+ID4gPiAgICAgICovCj4gPiA+ID4g ICAgIGlmIChkYXRhLT5ta29sZCAmJiAhc3RhZ2UyX3RyeV9zZXRfcHRlKGN0eCwgbmV3KSkKPiA+ ID4gPiAgICAgICAgICAgICByZXR1cm4gLUVBR0FJTjsKPiA+ID4KPiA+ID4gSXQgaXMgcHJvYmFi bHkgd29ydGggbWVudGlvbmluZyB0aGF0IGlmIHRoZXJlIHdhcyBhIHJhY2UgdG8gdXBkYXRlIHRo ZQo+ID4gPiBQVEUgdGhlbiB0aGUgR0ZOIGlzIG1vc3QgbGlrZWx5IHlvdW5nLCBzbyBmYWlsaW5n IHRvIGNsZWFyIEFGIHByb2JhYmx5Cj4gPiA+IGlzbid0IGV2ZW4gY29uc2VxdWVudGlhbC4KPiAK PiBUaGFua3MgT2xpdmVyLgo+IAo+ID4KPiA+IE9oLCBhbmQgdGhlIFdBUk5fT04oKSBpbiBrdm1f cGd0YWJsZV9zdGFnZTJfdGVzdF9jbGVhcl95b3VuZygpIGlzIGJvZ3VzCj4gPiBub3cuIE1heWJl IGRlbW90ZSBpdCB0bzoKPiA+Cj4gPiAgIHIgPSBrdm1fcGd0YWJsZV93YWxrKC4uLik7Cj4gPiAg IFdBUk5fT05fT05DRShyICYmIHIgIT0gLUVBR0FJTik7Cj4gCj4gT2gsIGluZGVlZCwgdGhhbmsg eW91LiBKdXN0IHRvIG1ha2Ugc3VyZSAtLSBkb2VzIGl0IG1ha2Ugc2Vuc2UgdG8KPiByZXRyeSB0 aGUgY21weGNoZyBpZiBpdCBmYWlscz8gRm9yIGV4YW1wbGUsIHRoZSB3YXkgSSBoYXZlIGl0IG5v dyBmb3IKPiB4ODZbMV0sIHdlIHJldHJ5IHRoZSBjbXB4Y2hnIGlmIHRoZSBzcHRlIGlzIHN0aWxs IGEgbGVhZiwgb3RoZXJ3aXNlIHdlCj4gbW92ZSBvbiB0byB0aGUgbmV4dCBvbmUgaGF2aW5nIGRv bmUgbm90aGluZy4gRG9lcyBzb21ldGhpbmcgbGlrZSB0aGF0Cj4gbWFrZSBzZW5zZSBmb3IgYXJt NjQ/CgpBdCBsZWFzdCBmb3IgYXJtNjQgSSBkbyBub3Qgc2VlIGEgbmVlZCBmb3IgcmV0cnkuIFRo ZSBvbmx5IHBvc3NpYmxlCnJhY2VzIGFyZToKCiAtIEEgc3RhZ2UtMiBmYXVsdCBoYW5kbGVyIGVz dGFibGlzaGluZyAvIGFkanVzdGluZyB0aGUgbWFwcGluZyBmb3IgdGhlCiAgIEdGTi4gSWYgdGhl IGd1ZXN0IGlzIGRpcmVjdGx5IGFjY2Vzc2luZyB0aGUgR0ZOIGluIHF1ZXN0aW9uLCB3aGF0J3MK ICAgdGhlIHBvaW50IG9mIHdpcGluZyBvdXQgQUY/CgogICBFdmVuIHdoZW4gcmV0dXJuaW5nIC1F QUdBSU4gd2UndmUgYWxyZWFkeSBwcmltZWQgc3RhZ2UyX2FnZV9kYXRhOjp5b3VuZywKICAgc28g d2UgcmVwb3J0IHRoZSBjb3JyZWN0IHN0YXRlIGJhY2sgdG8gdGhlIHByaW1hcnkgTU1VLgoKIC0g QW5vdGhlciBrdm1fYWdlX2dmbigpIHRyeWluZyB0byBhZ2UgdGhlIHNhbWUgR0ZOLiBJIGhhdmVu J3QgZXZlbgogICBsb29rZWQgdG8gc2VlIGlmIHRoaXMgaXMgcG9zc2libGUgZnJvbSB0aGUgcHJp bWFyeSBNTVUgUE9WLCBidXQgaW4KICAgdGhlb3J5IG9uZSBvZiB0aGUgY2FsbHMgd2lsbCB3aW4g dGhlIHJhY2UgYW5kIGNsZWFyIEFGLgoKR2l2ZW4gWXUncyBjb25jZXJucyBhYm91dCBtYWtpbmcg cGVuZGluZyB3cml0ZXJzIHdhaXQsIHdlIHNob3VsZCB0YWtlCmV2ZXJ5IG9wcG9ydHVuaXR5IHRv IGJhaWwgb24gdGhlIHdhbGsuCgotLSAKVGhhbmtzLApPbGl2ZXIKCl9fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBs aXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5m cmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK