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a="371733568" X-IronPort-AV: E=Sophos;i="5.92,269,1650956400"; d="scan'208";a="371733568" X-IronPort-AV: E=Sophos;i="5.92,269,1650956400"; d="scan'208";a="653722559" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, ehabkost@redhat.com, xiangfeix.ma@intel.com, xiaoyao.li@intel.com, seanjc@google.com Subject: [PATCH v2] target/i386: Restore TSX features with taa-no Date: Thu, 14 Jul 2022 13:36:31 +0800 Message-Id: <20220714053631.417152-1-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.25.1 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=192.55.52.43; envelope-from=zhenzhong.duan@intel.com; helo=mga05.intel.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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" X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1657777891653100001 Content-Type: text/plain; charset="utf-8" On ICX-2S2 host, when run L2 guest with both L1/L2 using Icelake-Server-v3 or above, we got below warning: "warning: host doesn't support requested feature: MSR(10AH).taa-no [bit 8]" This is because L1 KVM doesn't expose taa-no to L2 if RTM is disabled, then starting L2 qemu triggers the warning. Fix it by restoring TSX features in Icelake-Server-v3, which may also help guest performance if host isn't susceptible to TSX Async Abort (TAA) vulnerabilities. Fixes: d965dc35592d ("target/i386: Add ARCH_CAPABILITIES related bits into = Icelake-Server CPU model") Tested-by: Xiangfei Ma Signed-off-by: Zhenzhong Duan --- v2: Rewrite commit message target/i386/cpu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 14f681e998cc..25ef972a3eed 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -3423,6 +3423,9 @@ static const X86CPUDefinition builtin_x86_defs[] =3D { { .version =3D 3, .props =3D (PropValue[]) { + /* Restore TSX features removed by -v2 above */ + { "hle", "on" }, + { "rtm", "on" }, { "arch-capabilities", "on" }, { "rdctl-no", "on" }, { "ibrs-all", "on" }, --=20 2.25.1