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Thu, 24 Jun 2021 09:24:00 +0000 (UTC) Received: from imap.suse.de (imap-alt.suse-dmz.suse.de [192.168.254.47]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 18AB22195D; Thu, 24 Jun 2021 09:24:00 +0000 (UTC) Received: from imap3-int (imap-alt.suse-dmz.suse.de [192.168.254.47]) by imap.suse.de (Postfix) with ESMTP id E043011A97; Thu, 24 Jun 2021 09:23:59 +0000 (UTC) Received: from director2.suse.de ([192.168.254.72]) by imap3-int with ESMTPSA id z4GlNS9P1GAXQAAALh3uQQ (envelope-from ); Thu, 24 Jun 2021 09:23:59 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 38f517d1-93d5-440a-bd43-8e18a842ce72 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1624526640; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=lfjqJs9CAcNNhXC+z3oQjM+eSBWPvGfNycQzwEl7QRc=; b=oACgJAMzQXHmQq1hOAomY7FEw/X83+x+HLA/wZC55Kq3b6zfUsPM1cKCw4hcqV7m/VcOmO PZnvm8yoHQbpsfCSBzEX/AbBHY0q4K8c1qA3hWamw/164ENYSDXCK7wPPIhiiSDXwKeVfU jcHLYxZTFqZKbNqSc8f4P1loN+kzuHI= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1624526640; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=lfjqJs9CAcNNhXC+z3oQjM+eSBWPvGfNycQzwEl7QRc=; b=oACgJAMzQXHmQq1hOAomY7FEw/X83+x+HLA/wZC55Kq3b6zfUsPM1cKCw4hcqV7m/VcOmO PZnvm8yoHQbpsfCSBzEX/AbBHY0q4K8c1qA3hWamw/164ENYSDXCK7wPPIhiiSDXwKeVfU jcHLYxZTFqZKbNqSc8f4P1loN+kzuHI= Subject: Re: [PATCH 10/10] tools/xenstored: Delay new transaction while Live-Update is pending To: Julien Grall , xen-devel@lists.xenproject.org Cc: raphning@amazon.co.uk, doebel@amazon.de, Julien Grall , Ian Jackson , Wei Liu References: <20210616144324.31652-1-julien@xen.org> <20210616144324.31652-11-julien@xen.org> From: Juergen Gross Message-ID: Date: Thu, 24 Jun 2021 11:23:59 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <20210616144324.31652-11-julien@xen.org> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="IYkzF63UCtCJxdBqRNaYuPSRbLxNLC57b" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --IYkzF63UCtCJxdBqRNaYuPSRbLxNLC57b Content-Type: multipart/mixed; boundary="NcT2SaY58QGVI6xvg3pmLzItYEgMn1oml"; protected-headers="v1" From: Juergen Gross To: Julien Grall , xen-devel@lists.xenproject.org Cc: raphning@amazon.co.uk, doebel@amazon.de, Julien Grall , Ian Jackson , Wei Liu Message-ID: Subject: Re: [PATCH 10/10] tools/xenstored: Delay new transaction while Live-Update is pending References: <20210616144324.31652-1-julien@xen.org> <20210616144324.31652-11-julien@xen.org> In-Reply-To: <20210616144324.31652-11-julien@xen.org> --NcT2SaY58QGVI6xvg3pmLzItYEgMn1oml Content-Type: multipart/mixed; boundary="------------58443455899DAF2201504E25" Content-Language: en-US This is a multi-part message in MIME format. --------------58443455899DAF2201504E25 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 16.06.21 16:43, Julien Grall wrote: > From: Julien Grall >=20 > At the moment, Live-Update will, by default, not proceed if there are > in-flight transactions. It is possible force it by passing -F but this > will break any connection with in-flight transactions. >=20 > There are PV drivers out that may never terminate some transaction. On > host running such guest, we would need to use -F. Unfortunately, this > also risks to break well-behaving guests (and even dom0) because > Live-Update will happen as soon as the timeout is hit. >=20 > Ideally, we would want to preserve transactions but this requires > some work and a lot of testing to be able to use it in production. >=20 > As a stop gap, we want to limit the damage of -F. This patch will delay= > any transactions that are started after Live-Update has been requested.= >=20 > If the request cannot be delayed, the connection will be stalled to > avoid loosing requests. >=20 > If the connection has already a pending transaction before Live-Update,= > then new transaction will not be delayed. This is to avoid the connecti= on > to stall. >=20 > With this stop gap in place, domains with long running transactions wil= l > still break when using -F, but other domains which starts a transaction= > in the middle of Live-Update will continue to work. >=20 > Signed-off-by: Julien Grall Reviewed-by: Juergen Gross Juergen --------------58443455899DAF2201504E25 Content-Type: application/pgp-keys; name="OpenPGP_0xB0DE9DD628BF132F.asc" Content-Transfer-Encoding: quoted-printable Content-Description: OpenPGP public key Content-Disposition: attachment; filename="OpenPGP_0xB0DE9DD628BF132F.asc" -----BEGIN PGP PUBLIC KEY BLOCK----- xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOBy= cWx w3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJvedYm8O= f8Z d621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJNwQpd369y= 9bf IhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvxXP3FAp2pkW0xq= G7/ 377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEBAAHNHEp1ZXJnZW4gR= 3Jv c3MgPGpnQHBmdXBmLm5ldD7CwHkEEwECACMFAlOMcBYCGwMHCwkIBwMCAQYVCAIJCgsEFgIDA= QIe AQIXgAAKCRCw3p3WKL8TL0KdB/93FcIZ3GCNwFU0u3EjNbNjmXBKDY4FUGNQH2lvWAUy+dnyT= hpw dtF/jQ6j9RwE8VP0+NXcYpGJDWlNb9/JmYqLiX2Q3TyevpB0CA3dbBQp0OW0fgCetToGIQrg0= MbD 1C/sEOv8Mr4NAfbauXjZlvTj30H2jO0u+6WGM6nHwbh2l5O8ZiHkH32iaSTfN7Eu5RnNVUJbv= oPH Z8SlM4KWm8rG+lIkGurqqu5gu8q8ZMKdsdGC4bBxdQKDKHEFExLJK/nRPFmAuGlId1E3fe10v= 5QL +qHI3EIPtyfE7i9Hz6rVwi7lWKgh7pe0ZvatAudZ+JNIlBKptb64FaiIOAWDCx1SzR9KdWVyZ= 2Vu IEdyb3NzIDxqZ3Jvc3NAc3VzZS5jb20+wsB5BBMBAgAjBQJTjHCvAhsDBwsJCAcDAgEGFQgCC= QoL BBYCAwECHgECF4AACgkQsN6d1ii/Ey/HmQf/RtI7kv5A2PS4RF7HoZhPVPogNVbC4YA6lW7Dr= Wf0 teC0RR3MzXfy6pJ+7KLgkqMlrAbN/8Dvjoz78X+5vhH/rDLa9BuZQlhFmvcGtCF8eR0T1v0nC= /nu AFVGy+67q2DH8As3KPu0344TBDpAvr2uYM4tSqxK4DURx5INz4ZZ0WNFHcqsfvlGJALDeE0Lh= ITT d9jLzdDad1pQSToCnLl6SBJZjDOX9QQcyUigZFtCXFst4dlsvddrxyqT1f17+2cFSdu7+ynLm= XBK 7abQ3rwJY8SbRO2iRulogc5vr/RLMMlscDAiDkaFQWLoqHHOdfO9rURssHNN8WkMnQfvUewRz= 80h SnVlcmdlbiBHcm9zcyA8amdyb3NzQG5vdmVsbC5jb20+wsB5BBMBAgAjBQJTjHDXAhsDBwsJC= AcD AgEGFQgCCQoLBBYCAwECHgECF4AACgkQsN6d1ii/Ey8PUQf/ehmgCI9jB9hlgexLvgOtf7PJn= FOX gMLdBQgBlVPO3/D9R8LtF9DBAFPNhlrsfIG/SqICoRCqUcJ96Pn3P7UUinFG/I0ECGF4EvTE1= jnD kfJZr6jrbjgyoZHiw/4BNwSTL9rWASyLgqlA8u1mf+c2yUwcGhgkRAd1gOwungxcwzwqgljf0= N51 N5JfVRHRtyfwq/ge+YEkDGcTU6Y0sPOuj4Dyfm8fJzdfHNQsWq3PnczLVELStJNdapwPOoE+l= otu fe3AM2vAEYJ9rTz3Cki4JFUsgLkHFqGZarrPGi1eyQcXeluldO3m91NK/1xMI3/+8jbO0tsn1= tqS EUGIJi7ox80eSnVlcmdlbiBHcm9zcyA8amdyb3NzQHN1c2UuZGU+wsB5BBMBAgAjBQJTjHDrA= hsD BwsJCAcDAgEGFQgCCQoLBBYCAwECHgECF4AACgkQsN6d1ii/Ey+LhQf9GL45eU5vOowA2u5N3= g3O ZUEBmDHVVbqMtzwlmNC4k9Kx39r5s2vcFl4tXqW7g9/ViXYuiDXb0RfUpZiIUW89siKrkzmQ5= dM7 wRqzgJpJwK8Bn2MIxAKArekWpiCKvBOB/Cc+3EXE78XdlxLyOi/NrmSGRIov0karw2RzMNOu5= D+j LRZQd1Sv27AR+IP3I8U4aqnhLpwhK7MEy9oCILlgZ1QZe49kpcumcZKORmzBTNh30FVKK1Evm= V2x AKDoaEOgQB4iFQLhJCdP1I5aSgM5IVFdn7v5YgEYuJYx37IoN1EblHI//x/e2AaIHpzK5h88N= Eaw QsaNRpNSrcfbFmAg987ATQRTjHAWAQgAyzH6AOODMBjgfWE9VeCgsrwH3exNAU32gLq2xvjpW= nHI s98ndPUDpnoxWQugJ6MpMncr0xSwFmHEgnSEjK/PAjppgmyc57BwKII3sV4on+gDVFJR6Y8ZR= wgn BC5mVM6JjQ5xDk8WRXljExRfUX9pNhdE5eBOZJrDRoLUmmjDtKzWaDhIg/+1Hzz93X4fCQkNV= bVF LELU9bMaLPBG/x5q4iYZ2k2ex6d47YE1ZFdMm6YBYMOljGkZKwYde5ldM9mo45mmwe0icXKLk= pEd IXKTZeKDO+Hdv1aqFuAcccTg9RXDQjmwhC3yEmrmcfl0+rPghO0Iv3OOImwTEe4co3c1mwARA= QAB wsBfBBgBAgAJBQJTjHAWAhsMAAoJELDendYovxMvQ/gH/1ha96vm4P/L+bQpJwrZ/dneZcmEw= Tbe 8YFsw2V/Buv6Z4Mysln3nQK5ZadD534CF7TDVft7fC4tU4PONxF5D+/tvgkPfDAfF77zy2AH1= vJz Q1fOU8lYFpZXTXIHb+559UqvIB8AdgR3SAJGHHt4RKA0F7f5ipYBBrC6cyXJyyoprT10EMvU8= VGi wXvTyJz3fjoYsdFzpWPlJEBRMedCot60g5dmbdrZ5DWClAr0yau47zpWj3enf1tLWaqcsuylW= svi uGjKGw7KHQd3bxALOknAp4dN3QwBYCKuZ7AddY9yjynVaD5X7nF9nO5BjR/i1DG86lem3iBDX= zXs ZDn8R38=3D =3D2wuH -----END PGP PUBLIC KEY BLOCK----- --------------58443455899DAF2201504E25-- --NcT2SaY58QGVI6xvg3pmLzItYEgMn1oml-- --IYkzF63UCtCJxdBqRNaYuPSRbLxNLC57b Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAmDUTy8FAwAAAAAACgkQsN6d1ii/Ey82 8gf/W0WEIFnYqcX95AnediIZvOITedmkujGEiqhqJ/S/Q4wVaAfn52xChfWVrjM2HQr+2eLQzwJL lWA/4Va8Birjsulo4VdSflCSWDAs1Y8cXXXWIL0Ds4j7dF+HI7RTz8SgaFpHg5Td66q/tySuu1yQ m6N6WalmC0aHSFU9eRK0ZyKt6Y2dVLtm36d2hbES0bnlXlIOXNv2eLygyo1dKUr5Msa7lCUXK1A3 mJi/4p5QI1hr7dH+OsBdMxP1cyjJUrgIKrgxAlB2LxiX5LdhzWsKO+cQHCu3hfQxNjaINSY8MLxJ S1DOPTk3r8iMWS7F310BVZJ9lq6GaRm3UhkaQ0pJWA== =h+8i -----END PGP SIGNATURE----- --IYkzF63UCtCJxdBqRNaYuPSRbLxNLC57b--