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Fri, 21 Jun 2024 23:16:38 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEmPtVrEzr5x9l/4ocYRYlt0aqpuWv+ifFtUU7+6SCZfza1hj1lz74x/6kAg4tyOH4LOb1FWw== X-Received: by 2002:a17:907:a4cc:b0:a6f:e2a3:cd0 with SMTP id a640c23a62f3a-a6fe2a30dcfmr56780366b.9.1719036997472; Fri, 21 Jun 2024 23:16:37 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Richard Henderson Subject: [PULL 16/23] meson: allow configuring the x86-64 baseline Date: Sat, 22 Jun 2024 08:15:50 +0200 Message-ID: <20240622061558.530543-17-pbonzini@redhat.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240622061558.530543-1-pbonzini@redhat.com> References: <20240622061558.530543-1-pbonzini@redhat.com> MIME-Version: 1.0 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=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.145, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1719037101551100003 Content-Type: text/plain; charset="utf-8" Add a Meson option to configure which x86-64 instruction set to use. QEMU will now default to x86-64-v1 + cmpxchg16b for 64-bit builds (that corresponds to a Pentium 4 for 32-bit builds). The baseline can be tuned down to Pentium Pro for 32-bit builds (with -Dx86_version=3D0), or up as desired. Acked-by: Richard Henderson Signed-off-by: Paolo Bonzini --- meson.build | 41 ++++++++++++++++++++++++++++------- meson_options.txt | 3 +++ scripts/meson-buildoptions.sh | 3 +++ 3 files changed, 39 insertions(+), 8 deletions(-) diff --git a/meson.build b/meson.build index 97e00d6f59b..6e694ecd9fe 100644 --- a/meson.build +++ b/meson.build @@ -336,15 +336,40 @@ if host_arch =3D=3D 'i386' and not cc.links(''' qemu_common_flags =3D ['-march=3Di486'] + qemu_common_flags endif =20 -# Assume x86-64-v2 (minus CMPXCHG16B for 32-bit code) -if host_arch =3D=3D 'i386' - qemu_common_flags =3D ['-mfpmath=3Dsse'] + qemu_common_flags -endif +# Pick x86-64 baseline version if host_arch in ['i386', 'x86_64'] - qemu_common_flags =3D ['-mpopcnt', '-msse4.2'] + qemu_common_flags -endif -if host_arch =3D=3D 'x86_64' - qemu_common_flags =3D ['-mcx16'] + qemu_common_flags + if get_option('x86_version') =3D=3D '0' and host_arch =3D=3D 'x86_64' + error('x86_64-v1 required for x86-64 hosts') + endif + + # add flags for individual instruction set extensions + if get_option('x86_version') >=3D '1' + if host_arch =3D=3D 'i386' + qemu_common_flags =3D ['-mfpmath=3Dsse'] + qemu_common_flags + else + # present on basically all processors but technically not part of + # x86-64-v1, so only include -mneeded for x86-64 version 2 and above + qemu_common_flags =3D ['-mcx16'] + qemu_common_flags + endif + endif + if get_option('x86_version') >=3D '2' + qemu_common_flags =3D ['-mpopcnt'] + qemu_common_flags + qemu_common_flags =3D cc.get_supported_arguments('-mneeded') + qemu_co= mmon_flags + endif + if get_option('x86_version') >=3D '3' + qemu_common_flags =3D ['-mmovbe', '-mabm', '-mbmi1', '-mbmi2', '-mfma'= , '-mf16c'] + qemu_common_flags + endif + + # add required vector instruction set (each level implies those below) + if get_option('x86_version') =3D=3D '1' + qemu_common_flags =3D ['-msse2'] + qemu_common_flags + elif get_option('x86_version') =3D=3D '2' + qemu_common_flags =3D ['-msse4.2'] + qemu_common_flags + elif get_option('x86_version') =3D=3D '3' + qemu_common_flags =3D ['-mavx2'] + qemu_common_flags + elif get_option('x86_version') =3D=3D '4' + qemu_common_flags =3D ['-mavx512f', '-mavx512bw', '-mavx512cd', '-mavx= 512dq', '-mavx512vl'] + qemu_common_flags + endif endif =20 if get_option('prefer_static') diff --git a/meson_options.txt b/meson_options.txt index 7a79dd89706..6065ed2d352 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -370,3 +370,6 @@ option('qemu_ga_version', type: 'string', value: '', =20 option('hexagon_idef_parser', type : 'boolean', value : true, description: 'use idef-parser to automatically generate TCG code fo= r the Hexagon frontend') + +option('x86_version', type : 'combo', choices : ['0', '1', '2', '3', '4'],= value: '1', + description: 'tweak required x86_64 architecture version beyond com= piler default') diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh index 58d49a447d5..62842d47e88 100644 --- a/scripts/meson-buildoptions.sh +++ b/scripts/meson-buildoptions.sh @@ -82,6 +82,8 @@ meson_options_help() { printf "%s\n" ' --with-suffix=3DVALUE Suffix for QEMU data/modules= /config directories' printf "%s\n" ' (can be empty) [qemu]' printf "%s\n" ' --with-trace-file=3DVALUE Trace file prefix for simple= backend [trace]' + printf "%s\n" ' --x86-version=3DCHOICE tweak required x86_64 archit= ecture version beyond' + printf "%s\n" ' compiler default [1] (choices:= 0/1/2/3)' printf "%s\n" '' printf "%s\n" 'Optional features, enabled with --enable-FEATURE and' printf "%s\n" 'disabled with --disable-FEATURE, default is enabled if av= ailable' @@ -552,6 +554,7 @@ _meson_option_parse() { --disable-werror) printf "%s" -Dwerror=3Dfalse ;; --enable-whpx) printf "%s" -Dwhpx=3Denabled ;; --disable-whpx) printf "%s" -Dwhpx=3Ddisabled ;; + --x86-version=3D*) quote_sh "-Dx86_version=3D$2" ;; --enable-xen) printf "%s" -Dxen=3Denabled ;; --disable-xen) printf "%s" -Dxen=3Ddisabled ;; --enable-xen-pci-passthrough) printf "%s" -Dxen_pci_passthrough=3Denab= led ;; --=20 2.45.2