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Wed, 8 Jul 2020 09:22:38 -0700 (PDT) Received: from [192.168.0.14] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 465573F68F; Wed, 8 Jul 2020 09:22:37 -0700 (PDT) Subject: Re: [PATCH] arm64: kvm: Stop clobbering x0 for HVC_SOFT_RESTART To: Marc Zyngier , Andrew Scull References: <20200706095259.1338221-1-ascull@google.com> From: James Morse Message-ID: <83615788-3efd-3b97-d95a-a71fb748766c@arm.com> Date: Wed, 8 Jul 2020 17:22:28 +0100 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB Cc: kernel-team@android.com, kvmarm@lists.cs.columbia.edu X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu SGkgTWFyYywgQW5kcmV3LAoKT24gMDYvMDcvMjAyMCAxMToxMSwgTWFyYyBaeW5naWVyIHdyb3Rl Ogo+IE9uIDIwMjAtMDctMDYgMTA6NTIsIEFuZHJldyBTY3VsbCB3cm90ZToKPj4gSFZDX1NPRlRf UkVTVEFSVCBpcyBnaXZlbiB2YWx1ZXMgZm9yIHgwLTIgdGhhdCBpdCBzaG91bGQgaW5zdGFsbGVk Cj4+IGJlZm9yZSBleGl0aW5nIHRvIHRoZSBuZXcgYWRkcmVzcyBzbyBzaG91bGQgbm90IHNldCB4 MCB0byBzdHViIEhWQwo+PiBzdWNjZXNzIG9yIGZhaWx1cmUgY29kZS4KCj4+IGRpZmYgLS1naXQg YS9hcmNoL2FybTY0L2t2bS9oeXAtaW5pdC5TIGIvYXJjaC9hcm02NC9rdm0vaHlwLWluaXQuUwo+ PiBpbmRleCA2ZTZlZDU1ODFlZWQuLmU3NmMwZTg5ZDQ4ZSAxMDA2NDQKPj4gLS0tIGEvYXJjaC9h cm02NC9rdm0vaHlwLWluaXQuUwo+PiArKysgYi9hcmNoL2FybTY0L2t2bS9oeXAtaW5pdC5TCj4+ IEBAIC0xMzYsMTEgKzEzNiwxNSBAQCBTWU1fQ09ERV9TVEFSVChfX2t2bV9oYW5kbGVfc3R1Yl9o dmMpCj4+Cj4+IMKgMTrCoMKgwqAgY21wwqDCoMKgIHgwLCAjSFZDX1JFU0VUX1ZFQ1RPUlMKPj4g wqDCoMKgwqAgYi5uZcKgwqDCoCAxZgo+PiAtcmVzZXQ6Cj4+ICsKPj4gwqDCoMKgwqAgLyoKPj4g LcKgwqDCoMKgICogUmVzZXQga3ZtIGJhY2sgdG8gdGhlIGh5cCBzdHViLiBEbyBub3QgY2xvYmJl ciB4MC14NCBpbgo+PiAtwqDCoMKgwqAgKiBjYXNlIHdlIGNvbWluZyB2aWEgSFZDX1NPRlRfUkVT VEFSVC4KPj4gK8KgwqDCoMKgICogU2V0IHRoZSBIVkNfUkVTRVRfVkVDVE9SUyByZXR1cm4gY29k ZSBiZWZvcmUgZW50ZXJpbmcgdGhlIGNvbW1vbgo+PiArwqDCoMKgwqAgKiBwYXRoIHNvIHRoYXQg d2UgZG8gbm90IGNsb2JiZXIgeDAteDIgaW4gY2FzZSB3ZSBhcmUgY29taW5nIHZpYQo+PiArwqDC oMKgwqAgKiBIVkNfU09GVF9SRVNUQVJULgo+PiDCoMKgwqDCoMKgICovCj4+ICvCoMKgwqAgbW92 wqDCoMKgIHgwLCB4enIKPj4gK3Jlc2V0Ogo+PiArwqDCoMKgIC8qIFJlc2V0IGt2bSBiYWNrIHRv IHRoZSBoeXAgc3R1Yi4gKi8KPj4gwqDCoMKgwqAgbXJzwqDCoMKgIHg1LCBzY3Rscl9lbDIKPj4g wqDCoMKgwqAgbW92X3HCoMKgwqAgeDYsIFNDVExSX0VMeF9GTEFHUwo+PiDCoMKgwqDCoCBiaWPC oMKgwqAgeDUsIHg1LCB4NsKgwqDCoMKgwqDCoMKgIC8vIENsZWFyIFNDVExfTSBhbmQgZXRjCj4+ IEBAIC0xNTEsNyArMTU1LDYgQEAgcmVzZXQ6Cj4+IMKgwqDCoMKgIC8qIEluc3RhbGwgc3R1YiB2 ZWN0b3JzICovCj4+IMKgwqDCoMKgIGFkcl9swqDCoMKgIHg1LCBfX2h5cF9zdHViX3ZlY3RvcnMK Pj4gwqDCoMKgwqAgbXNywqDCoMKgIHZiYXJfZWwyLCB4NQo+PiAtwqDCoMKgIG1vdsKgwqDCoCB4 MCwgeHpyCj4+IMKgwqDCoMKgIGVyZXQKPj4KPj4gwqAxOsKgwqDCoCAvKiBCYWQgc3R1YiBjYWxs ICovCgo+IEh1aCwgbmljZSBjYXRjaC4gSSB3b25kZXIgd2hhdCB0aGUgZnVzcyBpcyBhYm91dCBr ZXhlYywgcmVhbGx5LAo+IGdpdmVuIHRoYXQgaXQgaXMgKnRoYXQqIGJyb2tlbi4KClRoaXMgd291 bGQgb25seSBiaXRlIGtkdW1wIG9uIGEgdjguMCBtYWNoaW5lIHdhcyBhbHNvIHJ1bm5pbmcgYSBL Vk0gZ3Vlc3QuCgpSZWd1bGFyIGtleGVjIHdvdWxkIGhhcHBlbiBhZnRlciBLVk0ncyBrdm1fcmVi b290X25vdGlmaWVyKCkgaGFzIGNhbGxlZApoYXJkd2FyZV9kaXNhYmxlX25vbG9jaygpIHdoaWNo IHVubG9hZHMgS1ZNIGFuZCByZXN0b3JlcyB0aGUgaHlwLXN0dWIuCgpJJ20gZ2xhZCBpdHMgYmVl biBjYXVnaHQgYW5kIGZpeGVkIQoKClRoYW5rcywKCkphbWVzCl9fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fCmt2bWFybSBtYWlsaW5nIGxpc3QKa3ZtYXJtQGxp c3RzLmNzLmNvbHVtYmlhLmVkdQpodHRwczovL2xpc3RzLmNzLmNvbHVtYmlhLmVkdS9tYWlsbWFu L2xpc3RpbmZvL2t2bWFybQo=