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From: Oliver Upton To: "sundongxu (A)" Cc: Marc Zyngier , yuzenghui@huawei.com, james.morse@arm.com, suzuki.poulose@arm.com, will@kernel.org, catalin.marinas@arm.com, wanghaibin.wang@huawei.com, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, jiangkunkun@huawei.com Subject: Re: [bug report] GICv4.1: VM performance degradation due to not trapping vCPU WFI Message-ID: References: <86v87t8ras.wl-maz@kernel.org> <89fe1503-6d62-90ca-5edb-e11c74846a00@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <89fe1503-6d62-90ca-5edb-e11c74846a00@huawei.com> X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240117_085118_906216_1FD87BAB X-CRM114-Status: GOOD ( 15.99 ) 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 T24gV2VkLCBKYW4gMTcsIDIwMjQgYXQgMTA6MjA6MzJQTSArMDgwMCwgc3VuZG9uZ3h1IChBKSB3 cm90ZToKPiBPbiAyMDI0LzEvMTYgMTk6MTMsIE1hcmMgWnluZ2llciB3cm90ZToKPiA+IE9uIFR1 ZSwgMTYgSmFuIDIwMjQgMDM6MjY6MDggKzAwMDAsICJzdW5kb25neHUgKEEpIiA8c3VuZG9uZ3h1 M0BodWF3ZWkuY29tPiB3cm90ZToKPiA+PiBXZSBmb3VuZCBhIHByb2JsZW0gYWJvdXQgR0lDdjQv NC4xLCBmb3IgZXhhbXBsZToKPiA+PiBXZSB1c2UgUUVNVSB0byBzdGFydCBhIFZNICg0IHZDUFVz IGFuZCA4RyBtZW1vcnkpLCBWTSBkaXNrIHdhcwo+ID4+IGNvbmZpZ3VyZWQgd2l0aCB2aXJ0aW8s IGFuZCB0aGUgbmV0d29yayBpcyBjb25maWd1cmVkIHdpdGggdmhvc3QtbmV0LAo+ID4+IHRoZSBD UFUgYWZmaW5pdHkgb2YgdGhlIHZDUFUgYW5kIGVtdWxhdG9yIGlzIGFzIGZvbGxvd3MsIGluIFZN IHhtbDoKCjxzbmlwPgoKPiA+PiAgIDxjcHV0dW5lPgo+ID4+ICAgICA8dmNwdXBpbiB2Y3B1PScw JyBjcHVzZXQ9JzQnLz4KPiA+PiAgICAgPHZjcHVwaW4gdmNwdT0nMScgY3B1c2V0PSc1Jy8+Cj4g Pj4gICAgIDx2Y3B1cGluIHZjcHU9JzInIGNwdXNldD0nNicvPgo+ID4+ICAgICA8dmNwdXBpbiB2 Y3B1PSczJyBjcHVzZXQ9JzcnLz4KPiA+PiAgICAgPGVtdWxhdG9ycGluIGNwdXNldD0nNCw1LDYs NycvPgo+ID4+ICAgPC9jcHV0dW5lPgoKPC9zbmlwPgoKPiA+IEVmZmVjdGl2ZWx5LCB3ZSBhcHBs eSB0aGUgc2FtZSBwcmluY2lwbGUgdG8gdlNHSXMgYXMgdG8gdkxQSXMsIGFuZCBpdAo+ID4gd2Fz IGZvdW5kIHRoYXQgdGhpcyBoZXVyaXN0aWMgd2FzIHByZXR0eSBiZW5lZmljaWFsIHRvIHZMUElz LiBJJ20gYQo+ID4gYml0IHN1cnByaXNlZCB0aGF0IHZTR0lzIGFyZSBzbyBkaWZmZXJlbnQgaW4g dGhlaXIgdXNhZ2UgcGF0dGVybi4KPiAKPiBJTU8sIHRoZSBwb2ludCBpcyBoeXBlcnZpc29yIG5v dCB0cmFwcGluZyB2Q1BVIFdGSSwgcmF0aGVyIHRoYW4KPiB2U0dJL3ZMUEkgdXNhZ2UgcGF0dGVy bi4KClN1cmUsIHRoYXQncyB3aGF0J3MgYWZmZWN0aW5nIHlvdXIgdXNlIGNhc2UsIGJ1dCB0aGUg bG9naWMgaW4gdGhlIGtlcm5lbApjYW1lIGFib3V0IGJlY2F1c2UgaW1wcm92aW5nIHZpcnR1YWwg aW50ZXJydXB0IGluamVjdGlvbiBoYXMgYmVlbiBmb3VuZAp0byBiZSBnZW5lcmFsbHkgdXNlZnVs LgoKPiA+IAo+ID4gRG9lcyBpdCBoZWxwIGlmIHlvdSBtb3ZlIHlvdXIgImVtdWxhdG9ycGluIiB0 byBzb21lIG90aGVyIHBoeXNpY2FsCj4gPiBDUFVzPwo+IAo+IFllc++8jGl0IGRvZXMsIGluIGtl cm5lbCA1LjEwIG9yIDYuNXJjMS4KCldvbid0IHlvdXIgVk0gaGF2ZSBhIHBvb3IgZXhwZXJpZW5j ZSBpbiB0aGlzIGNvbmZpZ3VyYXRpb24gcmVnYXJkbGVzcyBvZiBXRngKdHJhcHM/IFRoZSB2YWx1 ZSBvZiB2Q1BVIHBpbm5pbmcgaXMgdG8gKmlzb2xhdGUqIHRoZSB2Q1BVIHRocmVhZHMgZnJvbQpu b2lzZS9vdmVyaGVhZHMgb2YgdGhlIGhvc3QgYW5kIHNjaGVkdWxlciBsYXRlbmNpZXMuIFNlZW1z IHRvIG1lIHRoYXQKVk1NIG92ZXJoZWFkIHRocmVhZHMgYXJlIGJlaW5nIGZvcmNlZCB0byB0YWtl IHRpbWUgYXdheSBmcm9tIHRoZSBndWVzdC4KCk5ldmVydGhlbGVzcywgZGlzYWJsaW5nIFdGSSB0 cmFwcyBpc24ndCBnb2luZyB0byB3b3JrIHdlbGwgZm9yCm92ZXJjb21taXR0ZWQgc2NlbmFyaW9z LiBUaGUgdGhvdWdodCBvZiB0YWNraW5nIG9uIG1vcmUgaGFja3MgaW4gS1ZNIGhhcyBiZQphIGJp dCB1bmVhc3ksIHBlcmhhcHMgaW5zdGVhZCB3ZSBjYW4gZ2l2ZSB1c2Vyc3BhY2UgYW4gaW50ZXJm YWNlIHRvIGV4cGxpY2l0bHkKZW5hYmxlL2Rpc2FibGUgV0Z4IHRyYXBzIGFuZCBsZXQgaXQgcGlj ayBhIHN1aXRhYmxlIHBvbGljeS4KCi0tIApUaGFua3MsCk9saXZlcgoKX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5n IGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5p bmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=