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Mon, 23 Sep 2019 06:54:16 +0000 (UTC) Received: from EX13D20UWC001.ant.amazon.com (10.43.162.244) by EX13MTAUWC001.ant.amazon.com (10.43.162.135) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Mon, 23 Sep 2019 06:54:15 +0000 Received: from 38f9d3867b82.ant.amazon.com (10.43.161.217) by EX13D20UWC001.ant.amazon.com (10.43.162.244) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Mon, 23 Sep 2019 06:53:58 +0000 Subject: Re: [PATCH v7 11/21] RISC-V: KVM: Handle WFI exits for VCPU To: Anup Patel , Palmer Dabbelt , "Paul Walmsley" , Paolo Bonzini , Radim K CC: Daniel Lezcano , Thomas Gleixner , Atish Patra , Alistair Francis , Damien Le Moal , "Christoph Hellwig" , Anup Patel , "kvm@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "linux-kernel@vger.kernel.org" References: <20190904161245.111924-1-anup.patel@wdc.com> <20190904161245.111924-13-anup.patel@wdc.com> From: Alexander Graf Message-ID: <3c149ec4-38df-9073-2880-b28148d3c059@amazon.com> Date: Mon, 23 Sep 2019 08:53:49 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20190904161245.111924-13-anup.patel@wdc.com> Content-Language: en-US X-Originating-IP: [10.43.161.217] X-ClientProxiedBy: EX13D28UWC002.ant.amazon.com (10.43.162.145) To EX13D20UWC001.ant.amazon.com (10.43.162.244) Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CgpPbiAwNC4wOS4xOSAxODoxNSwgQW51cCBQYXRlbCB3cm90ZToKPiBXZSBnZXQgaWxsZWdhbCBp bnN0cnVjdGlvbiB0cmFwIHdoZW5ldmVyIEd1ZXN0L1ZNIGV4ZWN1dGVzIFdGSQo+IGluc3RydWN0 aW9uLgo+IAo+IFRoaXMgcGF0Y2ggaGFuZGxlcyBXRkkgdHJhcCBieSBibG9ja2luZyB0aGUgdHJh cHBlZCBWQ1BVIHVzaW5nCj4ga3ZtX3ZjcHVfYmxvY2soKSBBUEkuIFRoZSBibG9ja2VkIFZDUFUg d2lsbCBiZSBhdXRvbWF0aWNhbGx5Cj4gcmVzdW1lZCB3aGVuZXZlciBhIFZDUFUgaW50ZXJydXB0 IGlzIGluamVjdGVkIGZyb20gdXNlci1zcGFjZQo+IG9yIGZyb20gaW4ta2VybmVsIElSUUNISVAg ZW11bGF0aW9uLgo+IAo+IFNpZ25lZC1vZmYtYnk6IEFudXAgUGF0ZWwgPGFudXAucGF0ZWxAd2Rj LmNvbT4KPiBBY2tlZC1ieTogUGFvbG8gQm9uemluaSA8cGJvbnppbmlAcmVkaGF0LmNvbT4KPiBS ZXZpZXdlZC1ieTogUGFvbG8gQm9uemluaSA8cGJvbnppbmlAcmVkaGF0LmNvbT4KPiAtLS0KPiAg IGFyY2gvcmlzY3Yva3ZtL3ZjcHVfZXhpdC5jIHwgNzIgKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrKysrKysKPiAgIDEgZmlsZSBjaGFuZ2VkLCA3MiBpbnNlcnRpb25zKCspCj4gCj4g ZGlmZiAtLWdpdCBhL2FyY2gvcmlzY3Yva3ZtL3ZjcHVfZXhpdC5jIGIvYXJjaC9yaXNjdi9rdm0v dmNwdV9leGl0LmMKPiBpbmRleCBkNzVhNmMzNWI2YzcuLjM5NDY5ZjY3YjI0MSAxMDA2NDQKPiAt LS0gYS9hcmNoL3Jpc2N2L2t2bS92Y3B1X2V4aXQuYwo+ICsrKyBiL2FyY2gvcmlzY3Yva3ZtL3Zj cHVfZXhpdC5jCj4gQEAgLTEyLDYgKzEyLDEzIEBACj4gICAjaW5jbHVkZSA8bGludXgva3ZtX2hv c3QuaD4KPiAgICNpbmNsdWRlIDxhc20vY3NyLmg+Cj4gICAKPiArI2RlZmluZSBJTlNOX09QQ09E RV9NQVNLCTB4MDA3Ywo+ICsjZGVmaW5lIElOU05fT1BDT0RFX1NISUZUCTIKPiArI2RlZmluZSBJ TlNOX09QQ09ERV9TWVNURU0JMjgKPiArCj4gKyNkZWZpbmUgSU5TTl9NQVNLX1dGSQkJMHhmZmZm ZmYwMAo+ICsjZGVmaW5lIElOU05fTUFUQ0hfV0ZJCQkweDEwNTAwMDAwCj4gKwo+ICAgI2RlZmlu ZSBJTlNOX01BVENIX0xCCQkweDMKPiAgICNkZWZpbmUgSU5TTl9NQVNLX0xCCQkweDcwN2YKPiAg ICNkZWZpbmUgSU5TTl9NQVRDSF9MSAkJMHgxMDAzCj4gQEAgLTExMiw2ICsxMTksNjcgQEAKPiAg IAkJCQkgKHMzMikoKChpbnNuKSA+PiA3KSAmIDB4MWYpKQo+ICAgI2RlZmluZSBNQVNLX0ZVTkNU MwkJMHg3MDAwCj4gICAKPiArc3RhdGljIGludCB0cnVseV9pbGxlZ2FsX2luc24oc3RydWN0IGt2 bV92Y3B1ICp2Y3B1LAo+ICsJCQkgICAgICBzdHJ1Y3Qga3ZtX3J1biAqcnVuLAo+ICsJCQkgICAg ICB1bG9uZyBpbnNuKQo+ICt7Cj4gKwkvKiBSZWRpcmVjdCB0cmFwIHRvIEd1ZXN0IFZDUFUgKi8K PiArCWt2bV9yaXNjdl92Y3B1X3RyYXBfcmVkaXJlY3QodmNwdSwgRVhDX0lOU1RfSUxMRUdBTCwg aW5zbik7Cj4gKwo+ICsJcmV0dXJuIDE7Cj4gK30KPiArCj4gK3N0YXRpYyBpbnQgc3lzdGVtX29w Y29kZV9pbnNuKHN0cnVjdCBrdm1fdmNwdSAqdmNwdSwKPiArCQkJICAgICAgc3RydWN0IGt2bV9y dW4gKnJ1biwKPiArCQkJICAgICAgdWxvbmcgaW5zbikKPiArewo+ICsJaWYgKChpbnNuICYgSU5T Tl9NQVNLX1dGSSkgPT0gSU5TTl9NQVRDSF9XRkkpIHsKPiArCQl2Y3B1LT5zdGF0LndmaV9leGl0 X3N0YXQrKzsKPiArCQlpZiAoIWt2bV9hcmNoX3ZjcHVfcnVubmFibGUodmNwdSkpIHsKPiArCQkJ c3JjdV9yZWFkX3VubG9jaygmdmNwdS0+a3ZtLT5zcmN1LCB2Y3B1LT5hcmNoLnNyY3VfaWR4KTsK PiArCQkJa3ZtX3ZjcHVfYmxvY2sodmNwdSk7Cj4gKwkJCXZjcHUtPmFyY2guc3JjdV9pZHggPSBz cmN1X3JlYWRfbG9jaygmdmNwdS0+a3ZtLT5zcmN1KTsKPiArCQkJa3ZtX2NsZWFyX3JlcXVlc3Qo S1ZNX1JFUV9VTkhBTFQsIHZjcHUpOwo+ICsJCX0KPiArCQl2Y3B1LT5hcmNoLmd1ZXN0X2NvbnRl eHQuc2VwYyArPSBJTlNOX0xFTihpbnNuKTsKPiArCQlyZXR1cm4gMTsKPiArCX0KPiArCj4gKwly ZXR1cm4gdHJ1bHlfaWxsZWdhbF9pbnNuKHZjcHUsIHJ1biwgaW5zbik7Cj4gK30KPiArCj4gK3N0 YXRpYyBpbnQgaWxsZWdhbF9pbnN0X2ZhdWx0KHN0cnVjdCBrdm1fdmNwdSAqdmNwdSwgc3RydWN0 IGt2bV9ydW4gKnJ1biwKPiArCQkJICAgICAgdW5zaWduZWQgbG9uZyBpbnNuKQo+ICt7Cj4gKwl1 bnNpZ25lZCBsb25nIHV0X3NjYXVzZSA9IDA7Cj4gKwlzdHJ1Y3Qga3ZtX2NwdV9jb250ZXh0ICpj dDsKPiArCj4gKwlpZiAodW5saWtlbHkoKGluc24gJiAzKSAhPSAzKSkgewoKV2hhdCBkbyB0aGUg bG93IDIgYml0cyBtZWFuIGhlcmU/IE1heWJlIHlvdSBjYW4gdXNlIGEgZGVmaW5lIGluc3RlYWQ/ CgoKQWxleAoKCgoKQW1hem9uIERldmVsb3BtZW50IENlbnRlciBHZXJtYW55IEdtYkgKS3JhdXNl bnN0ci4gMzgKMTAxMTcgQmVybGluCkdlc2NoYWVmdHNmdWVocnVuZzogQ2hyaXN0aWFuIFNjaGxh ZWdlciwgUmFsZiBIZXJicmljaApFaW5nZXRyYWdlbiBhbSBBbXRzZ2VyaWNodCBDaGFybG90dGVu YnVyZyB1bnRlciBIUkIgMTQ5MTczIEIKU2l0ejogQmVybGluClVzdC1JRDogREUgMjg5IDIzNyA4 NzkKCgo=