From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: [Xen 4.12 bug] HVM/PVH boot confusion Date: Tue, 29 Jan 2019 19:49:51 +0000 Message-ID: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1267455176270907943==" Return-path: Content-Language: en-GB List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Xen-devel List Cc: Juergen Gross , Wei Liu , Jan Beulich , Roger Pau Monne List-Id: xen-devel@lists.xenproject.org --===============1267455176270907943== Content-Type: multipart/alternative; boundary="------------4A9A24F9D43D1E0071E12AD2" Content-Language: en-GB --------------4A9A24F9D43D1E0071E12AD2 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Hello, Given the following vm.cfg file: name="vm" type="hvm" vcpus=4 memory=1024 firmware_override="/root/xen-syms" kernel="/boot/vmlinuz-4.4-xen" ramdisk="/boot/initrd-4.4.0+10.img" cmdline="console=xen,pv dom0=pv --- earlyprintk=xen" Xen crashes with the following trace: (d15) (XEN) Xen BUG at pvh-boot.c:82 (d15) (XEN) ----[ Xen-4.12.0-rc x86_64 debug=y Not tainted ]---- (d15) (XEN) CPU: 0 (d15) (XEN) RIP: e008:[] pvh_init+0x27d/0x2fe (d15) (XEN) Xen call trace: (d15) (XEN) [] pvh_init+0x27d/0x2fe (d15) (XEN) [] __start_xen+0x14c/0x28f6 (d15) (XEN) [] __high_start+0x53/0x55 (d15) (XEN) (d15) (XEN) (d15) (XEN) **************************************** (d15) (XEN) Panic on CPU 0: (d15) (XEN) Xen BUG at pvh-boot.c:82 (d15) (XEN) **************************************** The problem is that Xen is started at its PVH entrypoint (contrary to the instructions in the vm config file), and Xen unconditionally expects RSDP to be passed. There are at least two bugs here. 1) RSDP was a late addition to the PVH boot protocol. Xen's PVH entrypoint must not mandate its existence, because there are releases of the domain builder which don't provide it. 2) The HVM/PVH boot confusion. This think this is a still-outstanding bug around the broken assumption that the hvmloader binary speaks the PVH protocol without advertising itself appropriately (I really regret not objecting to those patches before they went in). At the least, that needs fixing by putting a proper ELF note in hvmloader, and the domain builder needs to be updated to build all PVH-boot-ABI images consistently. I don't have time to look into this at the moment, if anyone fancies trying to fix these issues. ~Andrew --------------4A9A24F9D43D1E0071E12AD2 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: 8bit Hello,

Given the following vm.cfg file:

name="vm"
type="hvm"

vcpus=4
memory=1024

firmware_override="/root/xen-syms"

kernel="/boot/vmlinuz-4.4-xen"
ramdisk="/boot/initrd-4.4.0+10.img"

cmdline="console=xen,pv dom0=pv --- earlyprintk=xen"

Xen crashes with the following trace:

(d15) (XEN) Xen BUG at pvh-boot.c:82
(d15) (XEN) ----[ Xen-4.12.0-rc  x86_64  debug=y   Not tainted ]----
(d15) (XEN) CPU:    0
(d15) (XEN) RIP:    e008:[<ffff82d0804331f2>] pvh_init+0x27d/0x2fe
<snip>
(d15) (XEN) Xen call trace:
(d15) (XEN)    [<ffff82d0804331f2>] pvh_init+0x27d/0x2fe
(d15) (XEN)    [<ffff82d080429000>] __start_xen+0x14c/0x28f6
(d15) (XEN)    [<ffff82d0802000f3>] __high_start+0x53/0x55
(d15) (XEN)
(d15) (XEN)
(d15) (XEN) ****************************************
(d15) (XEN) Panic on CPU 0:
(d15) (XEN) Xen BUG at pvh-boot.c:82
(d15) (XEN) ****************************************

The problem is that Xen is started at its PVH entrypoint (contrary to the instructions in the vm config file), and Xen unconditionally expects RSDP to be passed.

There are at least two bugs here.

1) RSDP was a late addition to the PVH boot protocol. Xen's PVH entrypoint must not mandate its existence, because there are releases of the domain builder which don't provide it.

2) The HVM/PVH boot confusion. This think this is a still-outstanding bug around the broken assumption that the hvmloader binary speaks the PVH protocol without advertising itself appropriately (I really regret not objecting to those patches before they went in). At the least, that needs fixing by putting a proper ELF note in hvmloader, and the domain builder needs to be updated to build all PVH-boot-ABI images consistently.

I don't have time to look into this at the moment, if anyone fancies trying to fix these issues.

~Andrew
--------------4A9A24F9D43D1E0071E12AD2-- --===============1267455176270907943== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVs IG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0 cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZlbA== --===============1267455176270907943==-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roger Pau =?utf-8?B?TW9ubsOp?= Subject: Re: [Xen 4.12 bug] HVM/PVH boot confusion Date: Wed, 30 Jan 2019 12:25:20 +0100 Message-ID: <20190130112520.5xdysgunnl44vdpk@mac> References: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Andrew Cooper Cc: Juergen Gross , Anthony Perard , Wei Liu , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org QWRkaW5nIEFudGhvbnkgd2hvIGxpa2VseSBrbm93cyBtb3JlIGFib3V0IGFsbCB0aGlzIHNpbmNl IGl0J3MgY2xvc2VseQpyZWxhdGVkIHRvIFFFTVUuCgpPbiBUdWUsIEphbiAyOSwgMjAxOSBhdCAw Nzo0OTo1MVBNICswMDAwLCBBbmRyZXcgQ29vcGVyIHdyb3RlOgo+IEhlbGxvLAo+IAo+IEdpdmVu IHRoZSBmb2xsb3dpbmcgdm0uY2ZnIGZpbGU6Cj4gCj4gbmFtZT0idm0iCj4gdHlwZT0iaHZtIgo+ IAo+IHZjcHVzPTQKPiBtZW1vcnk9MTAyNAo+IAo+IGZpcm13YXJlX292ZXJyaWRlPSIvcm9vdC94 ZW4tc3ltcyIKPiAKPiBrZXJuZWw9Ii9ib290L3ZtbGludXotNC40LXhlbiIKPiByYW1kaXNrPSIv Ym9vdC9pbml0cmQtNC40LjArMTAuaW1nIgoKSSBrbm93IHZlcnkgbGl0dGxlIGFib3V0IGRpcmVj dCBrZXJuZWwgYm9vdGluZyB3aXRoIEhWTSwgYnV0IEkgYXNzdW1lCnVzaW5nIGZpcm13YXJlX292 ZXJyaWRlIGdldHMgcmlkIG9mIGh2bWxvYWRlciBhbmQgdGhlIEJJT1MvVUVGSQpwYXlsb2FkIHBs dXMgdGhlIG9wdGlvbiByb20gdG8gZGlyZWN0IGJvb3QgaW50byBhIExpbnV4IGtlcm5lbD8KClNv 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mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Liu Subject: Re: [Xen 4.12 bug] HVM/PVH boot confusion Date: Wed, 30 Jan 2019 11:59:58 +0000 Message-ID: <20190130115958.57zdigqskia37c3h@zion.uk.xensource.com> References: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Andrew Cooper Cc: Juergen Gross , Roger Pau Monne , Wei Liu , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org T24gVHVlLCBKYW4gMjksIDIwMTkgYXQgMDc6NDk6NTFQTSArMDAwMCwgQW5kcmV3IENvb3BlciB3 cm90ZToKPiBIZWxsbywKPiAKPiBHaXZlbiB0aGUgZm9sbG93aW5nIHZtLmNmZyBmaWxlOgo+IAo+ IG5hbWU9InZtIgo+IHR5cGU9Imh2bSIKPiAKPiB2Y3B1cz00Cj4gbWVtb3J5PTEwMjQKPiAKPiBm 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LnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony PERARD Subject: Re: [Xen 4.12 bug] HVM/PVH boot confusion Date: Wed, 30 Jan 2019 12:10:07 +0000 Message-ID: <20190130121007.GC2306@perard.uk.xensource.com> References: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> <20190130112520.5xdysgunnl44vdpk@mac> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <20190130112520.5xdysgunnl44vdpk@mac> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Roger Pau =?iso-8859-1?Q?Monn=E9?= Cc: Juergen Gross , Andrew Cooper , Wei Liu , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org T24gV2VkLCBKYW4gMzAsIDIwMTkgYXQgMTI6MjU6MjBQTSArMDEwMCwgUm9nZXIgUGF1IE1vbm7D qSB3cm90ZToKPiBBZGRpbmcgQW50aG9ueSB3aG8gbGlrZWx5IGtub3dzIG1vcmUgYWJvdXQgYWxs 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<8eb1e686-21e3-387e-6009-af9f0c3a28db@citrix.com> References: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> <20190130112520.5xdysgunnl44vdpk@mac> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20190130112520.5xdysgunnl44vdpk@mac> Content-Language: en-GB List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Cc: Juergen Gross , Anthony Perard , Wei Liu , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org T24gMzAvMDEvMjAxOSAxMToyNSwgUm9nZXIgUGF1IE1vbm7DqSB3cm90ZToKPiBBZGRpbmcgQW50 aG9ueSB3aG8gbGlrZWx5IGtub3dzIG1vcmUgYWJvdXQgYWxsIHRoaXMgc2luY2UgaXQncyBjbG9z ZWx5Cj4gcmVsYXRlZCB0byBRRU1VLgo+Cj4gT24gVHVlLCBKYW4gMjksIDIwMTkgYXQgMDc6NDk6 NTFQTSArMDAwMCwgQW5kcmV3IENvb3BlciB3cm90ZToKPj4gSGVsbG8sCj4+Cj4+IEdpdmVuIHRo ZSBmb2xsb3dpbmcgdm0uY2ZnIGZpbGU6Cj4+Cj4+IG5hbWU9InZtIgo+PiB0eXBlPSJodm0iCj4+ 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text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20190130115958.57zdigqskia37c3h@zion.uk.xensource.com> Content-Language: en-GB List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Wei Liu Cc: Juergen Gross , Roger Pau Monne , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org T24gMzAvMDEvMjAxOSAxMTo1OSwgV2VpIExpdSB3cm90ZToKPiBPbiBUdWUsIEphbiAyOSwgMjAx OSBhdCAwNzo0OTo1MVBNICswMDAwLCBBbmRyZXcgQ29vcGVyIHdyb3RlOgo+PiBIZWxsbywKPj4K Pj4gR2l2ZW4gdGhlIGZvbGxvd2luZyB2bS5jZmcgZmlsZToKPj4KPj4gbmFtZT0idm0iCj4+IHR5 cGU9Imh2bSIKPj4KPj4gdmNwdXM9NAo+PiBtZW1vcnk9MTAyNAo+Pgo+PiBmaXJtd2FyZV9vdmVy cmlkZT0iL3Jvb3QveGVuLXN5bXMiCj4+Cj4+IGtlcm5lbD0iL2Jvb3Qvdm1saW51ei00LjQteGVu Igo+PiByYW1kaXNrPSIvYm9vdC9pbml0cmQtNC40LjArMTAuaW1nIgo+Pgo+PiBjbWRsaW5lPSJj b25zb2xlPXhlbixwdiBkb20wPXB2IC0tLSBlYXJseXByaW50az14ZW4iCj4+Cj4gV2hhdCBpcyB5 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bnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Liu Subject: Re: [Xen 4.12 bug] HVM/PVH boot confusion Date: Wed, 30 Jan 2019 12:46:45 +0000 Message-ID: <20190130124645.xd7u6ai627tbn4fg@zion.uk.xensource.com> References: <5c7ab977-8b31-4266-188e-e0bb045ca085@citrix.com> <20190130115958.57zdigqskia37c3h@zion.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Andrew Cooper Cc: Juergen Gross , Roger Pau Monne , Wei Liu , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org T24gV2VkLCBKYW4gMzAsIDIwMTkgYXQgMTI6MzA6NDRQTSArMDAwMCwgQW5kcmV3IENvb3BlciB3 cm90ZToKPiA+PiBUaGVyZSBhcmUgYXQgbGVhc3QgdHdvIGJ1Z3MgaGVyZS4KPiA+Pgo+ID4+IDEp 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List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Andrew Cooper Cc: Juergen Gross , Roger Pau Monne , Wei Liu , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org T24gV2VkLCBKYW4gMzAsIDIwMTkgYXQgMTI6NDY6NDVQTSArMDAwMCwgV2VpIExpdSB3cm90ZToK PiBPbiBXZWQsIEphbiAzMCwgMjAxOSBhdCAxMjozMDo0NFBNICswMDAwLCBBbmRyZXcgQ29vcGVy IHdyb3RlOgo+ID4gPj4gVGhlcmUgYXJlIGF0IGxlYXN0IHR3byBidWdzIGhlcmUuCj4gPiA+Pgo+ ID4gPj4gMSkgUlNEUCB3YXMgYSBsYXRlIGFkZGl0aW9uIHRvIHRoZSBQVkggYm9vdCBwcm90b2Nv bC7CoCBYZW4ncyBQVkgKPiA+ID4+IGVudHJ5cG9pbnQgbXVzdCBub3QgbWFuZGF0ZSBpdHMgZXhp c3RlbmNlLCBiZWNhdXNlIHRoZXJlIGFyZSByZWxlYXNlcyBvZgo+ID4gPj4gdGhlIGRvbWFpbiBi dWlsZGVyIHdoaWNoIGRvbid0IHByb3ZpZGUgaXQuCj4gPiA+IFRoZSBpbm5lciBYZW4sIGluIHRo aXMgY2FzZSwgY2FuIGZhbGwgYmFjayB0byBzY2FubmluZyBsb3cgMU1CIG1lbW9yeQo+ID4gPiBm b3IgUlNEUC4KPiA+IAo+ID4gQWdyZWVkLgoKLS0tODwtLS0KRnJvbSA0NmUzNjg2MzU1ZGExNzc5 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<20190130124645.xd7u6ai627tbn4fg@zion.uk.xensource.com> <20190130133817.s2blsfsa7qhh3k6n@zion.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20190130133817.s2blsfsa7qhh3k6n@zion.uk.xensource.com> Content-Language: de-DE List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Wei Liu , Andrew Cooper Cc: Roger Pau Monne , Jan Beulich , Xen-devel List List-Id: xen-devel@lists.xenproject.org T24gMzAvMDEvMjAxOSAxNDozOCwgV2VpIExpdSB3cm90ZToKPiBPbiBXZWQsIEphbiAzMCwgMjAx OSBhdCAxMjo0Njo0NVBNICswMDAwLCBXZWkgTGl1IHdyb3RlOgo+PiBPbiBXZWQsIEphbiAzMCwg MjAxOSBhdCAxMjozMDo0NFBNICswMDAwLCBBbmRyZXcgQ29vcGVyIHdyb3RlOgo+Pj4+PiBUaGVy ZSBhcmUgYXQgbGVhc3QgdHdvIGJ1Z3MgaGVyZS4KPj4+Pj4KPj4+Pj4gMSkgUlNEUCB3YXMgYSBs YXRlIGFkZGl0aW9uIHRvIHRoZSBQVkggYm9vdCBwcm90b2NvbC7CoCBYZW4ncyBQVkgKPj4+Pj4g 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