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[76.251.165.188]) by smtp.gmail.com with ESMTPSA id t84sm294132oif.32.2020.09.03.14.00.05 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Thu, 03 Sep 2020 14:00:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=jbZUzUuJIhTs9gFdFE43wolgbeVB484D+UVnVZjxmoY=; b=hBD+bl9ZoakJP/g1P3Lzv1o6HuvcT6OA0hbTBJwBg3+wGcfZ6Qq/dr8rxT6ZhLOdbx rX616KSvkR7Vag0Oji7ynTCHSaqWKXLaMO/I2l94ZLPpTlVOp7Shz3Tmn+2dnjks+9BA 8O8SWUBr5nxuwBUKlgIaP2kJS808JeOSIafTugP6S75/8qv6IuzkVIEduk6H8ccFaAhZ 8fOTwTOol7Vg3NH1QzU+5hX9S4R+yEPWs4+vva8glghAqKNy2NukdwR4aPte4BGk5RqP Ej4TdIfFAte4558f8FvCXcclaISqdWY2iWzoE3ac8Cxczpr8mrwoxrnefhnDfaegiXv0 A6hw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=jbZUzUuJIhTs9gFdFE43wolgbeVB484D+UVnVZjxmoY=; b=OAKc6WVS2AludjdNGqXKm8v3hhpjWiX2Udv+q4qnH/1dn+kpZt/lDJZ7JhXLW6u7DS Izo0dk0oENjcQBoJQY0khdHtSlzcX6O8pp2XBkYTK3oyPuJSpYDrSZInX59me6flYSJV 5iqGKmpQpogqVYeR1XXKvfL/9NcnGidXlcGEiYONb9mW/Dx4gZ8F6Tetg/Jip04fBmAx 0VNXbc5TzFmtzuifHb7Hbx40OJHlJkKfky69bzK0gfhHHwi3TX0hPJoItkoZH9hgvbUN BeUA9JABlVCkDe+tNKpdJb6gx7PMNsM0PAHIiEMO1d60WQUiEPgTJ5QOzEhbhbpIlYEl D6nA== X-Gm-Message-State: AOAM531EVrP3egDd0xBAGfFKLSIQKUc2H0PjgtYE6av1UMJBuGqRRWNC xMhfBnI3X8vCLhl6M7brmPA2+KWJ7ZI= X-Google-Smtp-Source: ABdhPJxOEa4HeMaORqyd/A/vpdsSgLJ/3XWzo3WDhX8/x+4TwWvZI+j9avwQEjG5BSLj9dNxInpENg== X-Received: by 2002:a9d:6b8b:: with SMTP id b11mr2777318otq.357.1599166806349; Thu, 03 Sep 2020 14:00:06 -0700 (PDT) From: Michael Roth To: qemu-devel@nongnu.org Subject: [PATCH 01/77] hostmem: don't use mbind() if host-nodes is empty Date: Thu, 3 Sep 2020 15:58:19 -0500 Message-Id: <20200903205935.27832-2-mdroth@linux.vnet.ibm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200903205935.27832-1-mdroth@linux.vnet.ibm.com> References: <20200903205935.27832-1-mdroth@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::343; envelope-from=flukshun@gmail.com; helo=mail-ot1-x343.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Igor Mammedov , qemu-stable@nongnu.org, Eduardo Habkost Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) From: Igor Mammedov Since 5.0 QEMU uses hostmem backend for allocating main guest RAM. The backend however calls mbind() which is typically NOP in case of default policy/absent host-nodes bitmap. However when runing in container with black-listed mbind() syscall, QEMU fails to start with error "cannot bind memory to host NUMA nodes: Operation not permitted" even when user hasn't provided host-nodes to pin to explictly (which is the case with -m option) To fix issue, call mbind() only in case when user has provided host-nodes explicitly (i.e. host_nodes bitmap is not empty). That should allow to run QEMU in containers with black-listed mbind() without memory pinning. If QEMU provided memory-pinning is required user still has to white-list mbind() in container configuration. Reported-by: Manuel Hohmann Signed-off-by: Igor Mammedov Message-Id: <20200430154606.6421-1-imammedo@redhat.com> Tested-by: Philippe Mathieu-Daud=C3=A9 Cc: qemu-stable@nongnu.org Signed-off-by: Eduardo Habkost (cherry picked from commit 70b6d525dfb51d5e523d568d1139fc051bc223c5) Signed-off-by: Michael Roth --- backends/hostmem.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/backends/hostmem.c b/backends/hostmem.c index 327f9eebc3..0efd7b7bd6 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -383,8 +383,10 @@ host_memory_backend_memory_complete(UserCreatable *uc,= Error **errp) assert(sizeof(backend->host_nodes) >=3D BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long)); assert(maxnode <=3D MAX_NODES); - if (mbind(ptr, sz, backend->policy, - maxnode ? backend->host_nodes : NULL, maxnode + 1, flags= )) { + + if (maxnode && + mbind(ptr, sz, backend->policy, backend->host_nodes, maxnode += 1, + flags)) { if (backend->policy !=3D MPOL_DEFAULT || errno !=3D ENOSYS) { error_setg_errno(errp, errno, "cannot bind memory to host NUMA nodes"); --=20 2.17.1