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s=mimecast20190719; t=1678092433; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=sHwLHNH3FPXXpeNzRTV2uFlinD5O4VAUvDUShaonn/I=; b=ZfY2z3tPQDDvagTe3l0rMb9kuyzoNotU2j+ouBM8vZk3Yc1X289fjuynJQlOPr2Jf+u1b1 bTiZgzuHuJITI7Hp6KakZI3R79gA3BWILBbWpibdqwE+7r382OP9uVB8MZrlKXs4JA2vbi Jrexi/e8De5aJagGjN3RJ2nzcJLQI4U= X-MC-Unique: oNa827YsNu2Wk8Y-6k0icg-1 X-Original-To: libvir-list@listman.corp.redhat.com From: Thomas Huth To: qemu-devel@nongnu.org, Peter Maydell , Daniel Berrange , Paolo Bonzini Subject: [PATCH v4 1/5] docs/about/deprecated: Deprecate 32-bit x86 hosts for system emulation Date: Mon, 6 Mar 2023 09:46:54 +0100 Message-Id: <20230306084658.29709-2-thuth@redhat.com> In-Reply-To: <20230306084658.29709-1-thuth@redhat.com> References: <20230306084658.29709-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: libvir-list@redhat.com, Richard Henderson , Markus Armbruster , Maxim Levitsky , Wilfred Mallawa , qemu-arm@nongnu.org, Reinoud Zandijk , John Paul Adrian Glaubitz , xen-devel@lists.xenproject.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= Errors-To: libvir-list-bounces@redhat.com Sender: "libvir-list" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1678092436224100004 Hardly anybody still uses 32-bit x86 hosts today, so we should start deprecating them to stop wasting our time and CI minutes here. For example, there are also still some unresolved problems with these: When emulating 64-bit binaries in user mode, TCG does not honor atomicity for 64-bit accesses, which is "perhaps worse than not working at all" (quoting Richard). Let's simply make it clear that people should use 64-bit x86 hosts nowadays and we do not intend to fix/maintain the old 32-bit stuff. Reviewed-by: Daniel P. Berrang=C3=A9 Reviewed-by: Wilfred Mallawa Signed-off-by: Thomas Huth --- docs/about/deprecated.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index 15084f7bea..1ca9dc33d6 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -196,6 +196,17 @@ CI coverage support may bitrot away before the depreca= tion process completes. The little endian variants of MIPS (both 32 and 64 bit) are still a supported host architecture. =20 +System emulation on 32-bit x86 hosts (since 8.0) +'''''''''''''''''''''''''''''''''''''''''''''''' + +Support for 32-bit x86 host deployments is increasingly uncommon in mainst= ream +OS distributions given the widespread availability of 64-bit x86 hardware. +The QEMU project no longer considers 32-bit x86 support for system emulati= on to +be an effective use of its limited resources, and thus intends to disconti= nue +it. Since all recent x86 hardware from the past >10 years is capable of the +64-bit x86 extensions, a corresponding 64-bit OS should be used instead. + + QEMU API (QAPI) events ---------------------- =20 --=20 2.31.1