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charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Diff with 'spec-ctrl=3Dno' and without. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D --- xen.dmesg.5.log 2019-07-31 14:55:38.138173874 =EF=BF=BC+0800 +++ xen.dmesg.6.log 2019-07-31 14:59:50.223516313 =EF=BF=BC+0800 @@ -7,7 +7,7 @@ (XEN) Xen version 4.12.0_14-1 (abuild@suse.de) (gcc (SUSE Linux) 4.8.5) de= bug=3Dn Mon Jun 17 15:08:33 UTC 2019 (XEN) Latest ChangeSet: (XEN) Bootloader: GRUB2 2.02 -(XEN) Command line: vga=3Dgfx-1024x768x16 crashkernel=3D251M<4G ucode=3Dsc= an console=3Dvga,com1 loglvl=3Dall guest_loglvl=3Dall +(XEN) Command line: vga=3Dgfx-1024x768x16 crashkernel=3D251M<4G ucode=3Dsc= an spec-ctrl=3Dno console=3Dvga,com1 loglvl=3Dall guest_loglvl=3Dall (XEN) Xen image load base address: 0 (XEN) Video information: (XEN) VGA is graphics mode 1024x768, 16 bpp @@ -159,12 +159,12 @@ (XEN) Speculative mitigation facilities: (XEN) Hardware features: IBRS/IBPB STIBP L1D_FLUSH SSBD MD_CLEAR (XEN) Compiled-in support: INDIRECT_THUNK SHADOW_PAGING -(XEN) Xen settings: BTI-Thunk JMP, SPEC_CTRL: IBRS+ SSBD-, Other: IBPB L= 1D_FLUSH VERW +(XEN) Xen settings: BTI-Thunk JMP, SPEC_CTRL: IBRS- SSBD-, Other: (XEN) L1TF: believed vulnerable, maxphysaddr L1D 46, CPUID 46, Safe addr= ess 300000000000 -(XEN) Support for HVM VMs: MSR_SPEC_CTRL RSB EAGER_FPU MD_CLEAR -(XEN) Support for PV VMs: MSR_SPEC_CTRL RSB EAGER_FPU MD_CLEAR -(XEN) XPTI (64-bit PV only): Dom0 enabled, DomU enabled (with PCID) -(XEN) PV L1TF shadowing: Dom0 disabled, DomU enabled +(XEN) Support for HVM VMs: None MD_CLEAR +(XEN) Support for PV VMs: None MD_CLEAR +(XEN) XPTI (64-bit PV only): Dom0 disabled, DomU disabled (with PCID) +(XEN) PV L1TF shadowing: Dom0 disabled, DomU disabled (XEN) Using scheduler: SMP Credit Scheduler rev2 (credit2) (XEN) Initializing Credit2 scheduler (XEN) load_precision_shift: 18 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D In "Support for HVM VMs: Support for PV VMs: " lines, Others feature is reported as "NONE", MD_CLEAR not. code review: xen/arch/x86/spec_ctrl.c: 99 disable_common: 100 opt_rsb_pv =3D false; 101 opt_rsb_hvm =3D false; 102 opt_md_clear_pv =3D 0; <----- they have been disable w= hen 'spec-ctrl=3Dno' 103 opt_md_clear_hvm =3D 0; 104 X86_FEATURE_SC_VERW_PV, X86_FEATURE_SC_VERW_HVM will not be enabled 1070 if ( opt_md_clear_pv ) 1071 setup_force_cpu_cap(X86_FEATURE_SC_VERW_PV); 1072 if ( opt_md_clear_pv || opt_md_clear_hvm ) 1073 setup_force_cpu_cap(X86_FEATURE_SC_VERW_IDLE); 1074 if ( opt_md_clear_hvm && !(caps & ARCH_CAPS_SKIP_L1DFL) && !opt_= l1d_flush ) 1075 setup_force_cpu_cap(X86_FEATURE_SC_VERW_HVM); But when we report the status of MD_CLEAR, we use X86_FEATURE_MD_CLEAR to c= heck. it seems not good. 360 printk(" Support for HVM VMs:%s%s%s%s%s\n", 361 (boot_cpu_has(X86_FEATURE_SC_MSR_HVM) || 362 boot_cpu_has(X86_FEATURE_SC_RSB_HVM) || 363 opt_eager_fpu) ? "" = : " None", 364 boot_cpu_has(X86_FEATURE_SC_MSR_HVM) ? " MSR_SPEC_CT= RL" : "", 365 boot_cpu_has(X86_FEATURE_SC_RSB_HVM) ? " RSB" = : "", 366 opt_eager_fpu ? " EAGER_FPU" = : "", 367 ----> boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" = : ""); 368 369 #endif 370 #ifdef CONFIG_PV 371 printk(" Support for PV VMs:%s%s%s%s%s\n", 372 (boot_cpu_has(X86_FEATURE_SC_MSR_PV) || 373 boot_cpu_has(X86_FEATURE_SC_RSB_PV) || 374 opt_eager_fpu) ? "" = : " None", 375 boot_cpu_has(X86_FEATURE_SC_MSR_PV) ? " MSR_SPEC_CT= RL" : "", 376 boot_cpu_has(X86_FEATURE_SC_RSB_PV) ? " RSB" = : "", 377 opt_eager_fpu ? " EAGER_FPU" = : "", 378 ----> boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" = : ""); There is a patch for this issue. diff -Nurp xen-4.12.0-testing.orig/xen/arch/x86/spec_ctrl.c xen-4.12.0-test= ing/xen/arch/x86/spec_ctrl.c --- xen-4.12.0-testing.orig/xen/arch/x86/spec_ctrl.c 2019-07-31 13:49:41.75= 5568027 +0800 +++ xen-4.12.0-testing/xen/arch/x86/spec_ctrl.c 2019-07-31 15:08:10.1589944= 44 +0800 @@ -360,22 +360,24 @@ static void __init print_details(enum in printk(" Support for HVM VMs:%s%s%s%s%s\n", (boot_cpu_has(X86_FEATURE_SC_MSR_HVM) || boot_cpu_has(X86_FEATURE_SC_RSB_HVM) || + boot_cpu_has(X86_FEATURE_SC_VERW_HVM) || opt_eager_fpu) ? "" : = " None", boot_cpu_has(X86_FEATURE_SC_MSR_HVM) ? " MSR_SPEC_CTRL" : = "", boot_cpu_has(X86_FEATURE_SC_RSB_HVM) ? " RSB" : = "", opt_eager_fpu ? " EAGER_FPU" : = "", - boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" : = ""); + boot_cpu_has(X86_FEATURE_SC_VERW_HVM) ? " MD_CLEAR" : = ""); #endif #ifdef CONFIG_PV printk(" Support for PV VMs:%s%s%s%s%s\n", (boot_cpu_has(X86_FEATURE_SC_MSR_PV) || boot_cpu_has(X86_FEATURE_SC_RSB_PV) || + boot_cpu_has(X86_FEATURE_SC_VERW_PV) || opt_eager_fpu) ? "" : = " None", boot_cpu_has(X86_FEATURE_SC_MSR_PV) ? " MSR_SPEC_CTRL" : = "", boot_cpu_has(X86_FEATURE_SC_RSB_PV) ? " RSB" : = "", opt_eager_fpu ? " EAGER_FPU" : = "", - boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" : = ""); + boot_cpu_has(X86_FEATURE_SC_VERW_PV) ? " MD_CLEAR" : = ""); printk(" XPTI (64-bit PV only): Dom0 %s, DomU %s (with%s PCID)\n", opt_xpti_hwdom ? "enabled" : "disabled", Signed-off-by: James Wang --- xen/arch/x86/spec_ctrl.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c index cada9a058e..759eee452d 100644 --- a/xen/arch/x86/spec_ctrl.c +++ b/xen/arch/x86/spec_ctrl.c @@ -366,22 +366,24 @@ static void __init print_details(enum ind_thunk thunk= , uint64_t caps) printk(" Support for HVM VMs:%s%s%s%s%s\n", (boot_cpu_has(X86_FEATURE_SC_MSR_HVM) || boot_cpu_has(X86_FEATURE_SC_RSB_HVM) || + boot_cpu_has(X86_FEATURE_SC_VERW_HVM) || opt_eager_fpu) ? "" : = " None", boot_cpu_has(X86_FEATURE_SC_MSR_HVM) ? " MSR_SPEC_CTRL" : = "", boot_cpu_has(X86_FEATURE_SC_RSB_HVM) ? " RSB" : = "", opt_eager_fpu ? " EAGER_FPU" : = "", - boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" : = ""); + boot_cpu_has(X86_FEATURE_SC_VERW_HVM) ? " MD_CLEAR" : = ""); =20 #endif #ifdef CONFIG_PV printk(" Support for PV VMs:%s%s%s%s%s\n", (boot_cpu_has(X86_FEATURE_SC_MSR_PV) || boot_cpu_has(X86_FEATURE_SC_RSB_PV) || + boot_cpu_has(X86_FEATURE_SC_VERW_PV) || opt_eager_fpu) ? "" : = " None", boot_cpu_has(X86_FEATURE_SC_MSR_PV) ? " MSR_SPEC_CTRL" : = "", boot_cpu_has(X86_FEATURE_SC_RSB_PV) ? " RSB" : = "", opt_eager_fpu ? " EAGER_FPU" : = "", - boot_cpu_has(X86_FEATURE_MD_CLEAR) ? " MD_CLEAR" : = ""); + boot_cpu_has(X86_FEATURE_SC_VERW_PV) ? " MD_CLEAR" : = ""); =20 printk(" XPTI (64-bit PV only): Dom0 %s, DomU %s (with%s PCID)\n", opt_xpti_hwdom ? "enabled" : "disabled", --=20 2.22.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel