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banners=-,-,- X-VirusChecked: Checked Received: (qmail 30827 invoked from network); 14 Dec 2016 09:37:33 -0000 Received: from prv-mh.provo.novell.com (HELO prv-mh.provo.novell.com) (137.65.248.74) by server-3.tower-206.messagelabs.com with DHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 14 Dec 2016 09:37:33 -0000 Received: from INET-PRV-MTA by prv-mh.provo.novell.com with Novell_GroupWise; Wed, 14 Dec 2016 02:37:31 -0700 Message-Id: <585120EA020000780012902C@prv-mh.provo.novell.com> X-Mailer: Novell GroupWise Internet Agent 14.2.1 Date: Wed, 14 Dec 2016 02:37:30 -0700 From: "Jan Beulich" To: "xen-devel" Mime-Version: 1.0 Cc: Andrew Cooper Subject: [Xen-devel] [PATCH] x86emul: support fencing insns X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Jan Beulich x86emul: support fencing insns Signed-off-by: Jan Beulich --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -5190,8 +5190,26 @@ x86_emulate( case X86EMUL_OPC(0x0f, 0xae): case X86EMUL_OPC_66(0x0f, 0xae): /* Grp15 */ switch ( modrm_reg & 7 ) { - case 7: /* clflush{,opt} */ - fail_if(modrm_mod == 3); + case 5: /* lfence */ + fail_if(modrm_mod != 3); + generate_exception_if(vex.pfx, EXC_UD); + vcpu_must_have(sse2); + asm volatile ( "lfence" ::: "memory" ); + break; + case 6: /* mfence */ + fail_if(modrm_mod != 3); + generate_exception_if(vex.pfx, EXC_UD); + vcpu_must_have(sse2); + asm volatile ( "mfence" ::: "memory" ); + break; + case 7: /* clflush{,opt} / sfence */ + if ( modrm_mod == 3 ) + { + generate_exception_if(vex.pfx, EXC_UD); + vcpu_must_have(sse); + asm volatile ( "sfence" ::: "memory" ); + break; + } if ( !vex.pfx ) vcpu_must_have(clflush); else --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -5190,8 +5190,26 @@ x86_emulate( case X86EMUL_OPC(0x0f, 0xae): case X86EMUL_OPC_66(0x0f, 0xae): /* Grp15 */ switch ( modrm_reg & 7 ) { - case 7: /* clflush{,opt} */ - fail_if(modrm_mod == 3); + case 5: /* lfence */ + fail_if(modrm_mod != 3); + generate_exception_if(vex.pfx, EXC_UD); + vcpu_must_have(sse2); + asm volatile ( "lfence" ::: "memory" ); + break; + case 6: /* mfence */ + fail_if(modrm_mod != 3); + generate_exception_if(vex.pfx, EXC_UD); + vcpu_must_have(sse2); + asm volatile ( "mfence" ::: "memory" ); + break; + case 7: /* clflush{,opt} / sfence */ + if ( modrm_mod == 3 ) + { + generate_exception_if(vex.pfx, EXC_UD); + vcpu_must_have(sse); + asm volatile ( "sfence" ::: "memory" ); + break; + } if ( !vex.pfx ) vcpu_must_have(clflush); else