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[104.129.187.94]) by smtp.gmail.com with ESMTPSA id v6sm16201450qkd.46.2019.04.07.19.20.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 07 Apr 2019 19:20:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=1vHiXAg79l9IJh/5FNvQ5ujKHABrFFpNaP9piWBe8tQ=; b=oaoOe4X/UNWoaDlDAR+vVa22fOxrQIog0Za3y9MwkeAnyj8CXE/cof8ZPrvF9Wq6PJ NWRuy1iLRhg8tjoToThwwskURvR/m8nfoJ8CDD+cglHIrWbmNECgfNqXW2c8iAiTaNx7 Hf1sxrA71jO2iiASLONT23oLtrsGE/5V5jod3RexITl1DF69lEVCZ+cZaP/Lk9IvdCFR bsHjnblfk0Nx1JNOtdd7hH8+ZBzMvhTnwxFeZlT3/ANaka0Brugg+Fx9CNKwLOQmUa45 VfKQ87OUEwi7WrgG8shyaMU5f+RHeeL6c203as2Epw8KVw18fS81U1jQoJdLGVtuPh8l iH2g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=1vHiXAg79l9IJh/5FNvQ5ujKHABrFFpNaP9piWBe8tQ=; b=QmcSIr+euRWr3r72++ml57oeFtCzN0qmfovfNw+evQ/AGKfkm69Ig5U4nBa7kapc4q cSGFBId+zXcau/2Fere0xPjZsRt1qhGVbYTHDRrxurpfMivwCiBm9m8mFZ4VCGANNhvJ Cpn5HI7XJ37/TWB5PpGIixdf8YWPvyCtWu3BwdSnktDrSO6DAPXKuyA398XkJdIEHbkm mqrMMQozlYGIBMwISthRKrs2g49Ifh8zl4ZfHTMEUVMswvMtZ/sV3ZASocMzAdMW2Fk4 ja5svNCrracSKxU5BP/MpHNo98KIpSr7sUv4y9xS/0FqUWxVZmeMK8Xv0uicBOIktgor PIVA== X-Gm-Message-State: APjAAAVfrgTyEkCz4WMuhtrSZhjjIFhfesMAQkhmBkPlBoi0f70Bbbmz kn9KPZRLhVNf9l4SSX8zrQM= X-Google-Smtp-Source: APXvYqyXXZgc83JFOOopLjTmkmycz9wmRT6YL3u/XHxCzFJaPDRMEUXLdd+nG6RxOzA/sV3v4YiDjQ== X-Received: by 2002:ac8:950:: with SMTP id z16mr21962675qth.16.1554690045211; Sun, 07 Apr 2019 19:20:45 -0700 (PDT) From: Catherine Ho To: Paolo Bonzini , Richard Henderson , "Dr. David Alan Gilbert" Date: Sun, 7 Apr 2019 22:19:05 -0400 Message-Id: <1554689945-18619-1-git-send-email-catherine.hecx@gmail.com> X-Mailer: git-send-email 1.7.1 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::843 Subject: [Qemu-devel] [PATCH] hostmem-file: warn when memory-backend-file, share=on and in incoming migration X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, Catherine Ho , Markus Armbruster , Peter Xu , Juan Quintela Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Currently it is not forbidden to use "-object memory-backend-file,share=3Do= n" and together with "-incoming". But after incoming migration is finished, the memory-backend-file will be definitely written if share=3Don. So the memory-backend-file can only be used once, but failed in the 2nd time incoming. Thus it gives a warning and the users can run the qemu if they really want to do it. Signed-off-by: Catherine Ho --- backends/hostmem-file.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c index 37ac6445d2..59429ee0b4 100644 --- a/backends/hostmem-file.c +++ b/backends/hostmem-file.c @@ -16,6 +16,7 @@ #include "sysemu/hostmem.h" #include "sysemu/sysemu.h" #include "qom/object_interfaces.h" +#include "migration/migration.h" =20 /* hostmem-file.c */ /** @@ -79,6 +80,16 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Er= ror **errp) } } =20 + /* + * In ignore shared case, if share=3Don for host memory backend file, + * the ram might be written after incoming process is finished. Thus + * the memory backend can't be reused for 2nd/3rd... incoming + */ + if (backend->share && migrate_ignore_shared() + && runstate_check(RUN_STATE_INMIGRATE)) + warn_report("share=3Don for memory backend file might be " + "conflicted with incoming in ignore shared case"); + backend->force_prealloc =3D mem_prealloc; name =3D host_memory_backend_get_name(backend); memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), --=20 2.17.1