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Fri, 02 Aug 2024 12:32:10 -0700 (PDT) Date: Fri, 2 Aug 2024 12:32:09 -0700 In-Reply-To: Mime-Version: 1.0 References: <20240726235234.228822-1-seanjc@google.com> <20240726235234.228822-65-seanjc@google.com> Message-ID: Subject: Re: [PATCH v12 64/84] KVM: LoongArch: Mark "struct page" pfns dirty only in "slow" page fault path From: Sean Christopherson To: maobibo Cc: Paolo Bonzini , Marc Zyngier , Oliver Upton , Tianrui Zhao , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, David Matlack , David Stevens X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240802_123212_445789_57810722 X-CRM114-Status: GOOD ( 19.40 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gRnJpLCBBdWcgMDIsIDIwMjQsIG1hb2JpYm8gd3JvdGU6Cj4gT24gMjAyNC83LzI3IOS4iuWN iDc6NTIsIFNlYW4gQ2hyaXN0b3BoZXJzb24gd3JvdGU6Cj4gPiBNYXJrIHBhZ2VzL2ZvbGlvcyBk aXJ0eSBvbmx5IHRoZSBzbG93IHBhZ2UgZmF1bHQgcGF0aCwgaS5lLiBvbmx5IHdoZW4KPiA+IG1t dV9sb2NrIGlzIGhlbGQgYW5kIHRoZSBvcGVyYXRpb24gaXMgbW11X25vdGlmaWVyLXByb3RlY3Rl ZCwgYXMgbWFya2luZyBhCj4gPiBwYWdlL2ZvbGlvIGRpcnR5IGFmdGVyIGl0IGhhcyBiZWVuIHdy aXR0ZW4gYmFjayBjYW4gbWFrZSBzb21lIGZpbGVzeXN0ZW1zCj4gPiB1bmhhcHB5IChiYWNraW5n IEtWTSBndWVzdHMgd2lsbCBzdWNoIGZpbGVzeXN0ZW0gZmlsZXMgaXMgdW5jb21tb24sIGFuZAo+ ID4gdGhlIHJhY2UgaXMgbWludXNjdWxlLCBoZW5jZSB0aGUgbGFjayBvZiBjb21wbGFpbnRzKS4K PiA+IAo+ID4gU2VlIHRoZSBsaW5rIGJlbG93IGZvciBkZXRhaWxzLgo+ID4gCj4gPiBMaW5rOiBo dHRwczovL2xvcmUua2VybmVsLm9yZy9hbGwvY292ZXIuMTY4MzA0NDE2Mi5naXQubHN0b2FrZXNA Z21haWwuY29tCj4gPiBTaWduZWQtb2ZmLWJ5OiBTZWFuIENocmlzdG9waGVyc29uIDxzZWFuamNA Z29vZ2xlLmNvbT4KPiA+IC0tLQo+ID4gICBhcmNoL2xvb25nYXJjaC9rdm0vbW11LmMgfCAxOCAr KysrKysrKysrLS0tLS0tLS0KPiA+ICAgMSBmaWxlIGNoYW5nZWQsIDEwIGluc2VydGlvbnMoKyks IDggZGVsZXRpb25zKC0pCj4gPiAKPiA+IGRpZmYgLS1naXQgYS9hcmNoL2xvb25nYXJjaC9rdm0v bW11LmMgYi9hcmNoL2xvb25nYXJjaC9rdm0vbW11LmMKPiA+IGluZGV4IDI2MzRhOWU4ZDgyYy4u MzY0ZGQzNWUwNTU3IDEwMDY0NAo+ID4gLS0tIGEvYXJjaC9sb29uZ2FyY2gva3ZtL21tdS5jCj4g PiArKysgYi9hcmNoL2xvb25nYXJjaC9rdm0vbW11LmMKPiA+IEBAIC02MDgsMTMgKzYwOCwxMyBA QCBzdGF0aWMgaW50IGt2bV9tYXBfcGFnZV9mYXN0KHN0cnVjdCBrdm1fdmNwdSAqdmNwdSwgdW5z aWduZWQgbG9uZyBncGEsIGJvb2wgd3JpdAo+ID4gICAJCWlmIChrdm1fcHRlX3lvdW5nKGNoYW5n ZWQpKQo+ID4gICAJCQlrdm1fc2V0X3Bmbl9hY2Nlc3NlZChwZm4pOwo+ID4gLQkJaWYgKGt2bV9w dGVfZGlydHkoY2hhbmdlZCkpIHsKPiA+IC0JCQltYXJrX3BhZ2VfZGlydHkoa3ZtLCBnZm4pOwo+ ID4gLQkJCWt2bV9zZXRfcGZuX2RpcnR5KHBmbik7Cj4gPiAtCQl9Cj4gPiAgIAkJaWYgKHBhZ2Up Cj4gPiAgIAkJCXB1dF9wYWdlKHBhZ2UpOwo+ID4gICAJfQo+ID4gKwo+ID4gKwlpZiAoa3ZtX3B0 ZV9kaXJ0eShjaGFuZ2VkKSkKPiA+ICsJCW1hcmtfcGFnZV9kaXJ0eShrdm0sIGdmbik7Cj4gPiAr Cj4gPiAgIAlyZXR1cm4gcmV0Owo+ID4gICBvdXQ6Cj4gPiAgIAlzcGluX3VubG9jaygma3ZtLT5t bXVfbG9jayk7Cj4gPiBAQCAtOTE1LDEyICs5MTUsMTQgQEAgc3RhdGljIGludCBrdm1fbWFwX3Bh Z2Uoc3RydWN0IGt2bV92Y3B1ICp2Y3B1LCB1bnNpZ25lZCBsb25nIGdwYSwgYm9vbCB3cml0ZSkK PiA+ICAgCWVsc2UKPiA+ICAgCQkrK2t2bS0+c3RhdC5wYWdlczsKPiA+ICAgCWt2bV9zZXRfcHRl KHB0ZXAsIG5ld19wdGUpOwo+ID4gLQlzcGluX3VubG9jaygma3ZtLT5tbXVfbG9jayk7Cj4gPiAt CWlmIChwcm90X2JpdHMgJiBfUEFHRV9ESVJUWSkgewo+ID4gLQkJbWFya19wYWdlX2RpcnR5X2lu X3Nsb3Qoa3ZtLCBtZW1zbG90LCBnZm4pOwo+ID4gKwlpZiAod3JpdGVhYmxlKQo+IElzIGl0IGJl dHRlciB0byB1c2Ugd3JpdGUgb3IgKHByb3RfYml0cyAmIF9QQUdFX0RJUlRZKSBoZXJlPyAgd3Jp dGFibGUgaXMKPiBwdGUgcGVybWlzc2lvbiBmcm9tIGZ1bmN0aW9uIGh2YV90b19wZm5fc2xvdygp LCB3cml0ZSBpcyBmYXVsdCBhY3Rpb24uCgpNYXJraW5nIGZvbGlvcyBkaXJ0eSBpbiB0aGUgc2xv dy9mdWxsIHBhdGggYmFzaWNhbGx5IG5lY2Vzc2l0YXRlcyBtYXJraW5nIHRoZQpmb2xpbyBkaXJ0 eSBpZiBLVk0gY3JlYXRlcyBhIHdyaXRhYmxlIFNQVEUsIGFzIEtWTSB3b24ndCBtYXJrIHRoZSBm b2xpbyBkaXJ0eQppZi93aGVuIF9QQUdFX0RJUlRZIGlzIHNldC4KClByYWN0aWNhbGx5IHNwZWFr aW5nLCBJJ20gOTkuOSUgY2VydGFpbiBpdCBkb2Vzbid0IG1hdHRlci4gIFRoZSBmb2xpbyBpcyBt YXJrZWQKZGlydHkgYnkgY29yZSBNTSB3aGVuIHRoZSBmb2xpbyBpcyBtYWRlIHdyaXRhYmxlLCBh bmQgY2xlYW5pbmcgdGhlIGZvbGlvIHRyaWdnZXJzCmFuIG1tdV9ub3RpZmllciBpbnZhbGlkYXRp b24uICBJLmUuIGlmIHRoZSBwYWdlIGlzIG1hcHBlZCB3cml0YWJsZSBpbiBLVk0ncwpzdGFnZS0y IFBURXMsIHRoZW4gaXRzIGZvbGlvIGhhcyBhbHJlYWR5IGJlZW4gbWFya2VkIGRpcnR5LgoKX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtcmlzY3Yg bWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3Rz LmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=