From: Peter Zijlstra <peterz@infradead.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Christian König" <christian.koenig@amd.com>,
"Jann Horn" <jannh@google.com>,
"Harry Wentland" <harry.wentland@amd.com>,
"Leo Li" <sunpeng.li@amd.com>,
amd-gfx@lists.freedesktop.org,
"Alex Deucher" <alexander.deucher@amd.com>,
"David (ChunMing) Zhou" <David1.Zhou@amd.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"the arch/x86 maintainers" <x86@kernel.org>,
"kernel list" <linux-kernel@vger.kernel.org>,
"Josh Poimboeuf" <jpoimboe@redhat.com>,
"Andy Lutomirski" <luto@kernel.org>,
"Arnaldo Carvalho de Melo" <acme@kernel.org>
Subject: Re: AMD DC graphics display code enables -mhard-float, -msse, -msse2 without any visible FPU state protection
Date: Mon, 6 Apr 2020 12:21:07 +0200 [thread overview]
Message-ID: <20200406102107.GI20730@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200405121930.e3ea3e7acc7588102de483e2@kernel.org>
On Sun, Apr 05, 2020 at 12:19:30PM +0900, Masami Hiramatsu wrote:
> > @@ -269,14 +269,14 @@ d4: AAM Ib (i64)
> > d5: AAD Ib (i64)
> > d6:
> > d7: XLAT/XLATB
> > -d8: ESC
> > -d9: ESC
> > -da: ESC
> > -db: ESC
> > -dc: ESC
> > -dd: ESC
> > -de: ESC
> > -df: ESC
> > +d8: FPU
> > +d9: FPU
> > +da: FPU
> > +db: FPU
> > +dc: FPU
> > +dd: FPU
> > +de: FPU
> > +df: FPU
>
> I don't want to use FPU since Intel SDM is still using ESC because it
> is co-processor escape code.
But we all know that co-processor is x87. Can we then perhaps put in
'x87' as an escape code instead of 'ESC' ?
> Here is the new patch.
>
> From d7eca4946ab3f0d08ad1268f49418f8655aaf57c Mon Sep 17 00:00:00 2001
> From: Masami Hiramatsu <mhiramat@kernel.org>
> Date: Fri, 3 Apr 2020 16:58:22 +0900
> Subject: [PATCH] x86: insn: Add insn_is_fpu()
>
> Add insn_is_fpu(insn) which tells that the insn is
> whether touch the MMX/XMM/YMM register or the instruction
> of FP coprocessor.
>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
arch/x86/mm/extable.o: warning: objtool: ex_handler_fprestore()+0x8b: fpu_safe hint not an FPU instruction
008b 36b: 48 0f ae 0d 00 00 00 fxrstor64 0x0(%rip) # 373 <ex_handler_fprestore+0x93>
arch/x86/kvm/x86.o: warning: objtool: kvm_load_guest_fpu.isra.0()+0x1fa: fpu_safe hint not an FPU instruction
01fa 1d2fa: 48 0f ae 4b 40 fxrstor64 0x40(%rbx)
Also, all the VMX bits seems to qualify as FPU (I can't remember seeing
that previously):
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_apic_eoi_induced()+0x20: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_apic_write()+0x20: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_invlpg()+0x20: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_interrupt_shadow()+0x1c: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_decache_cr4_guest_bits()+0x5a: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_decache_cr0_guest_bits()+0x5a: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_io()+0x24: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_apic_access()+0x39: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_idt()+0x57: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_exit_info()+0x58: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_gdt()+0x57: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_guest_apic_has_interrupt()+0xf8: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_nmi_allowed()+0x98: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_handle_exit_irqoff()+0xb3: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_nmi_mask()+0x8a: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_rflags()+0x99: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_ept_misconfig()+0x22: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_interrupt_allowed()+0x8d: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_write_pml_buffer()+0x1c5: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_invpcid()+0x26a: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_read_guest_seg_ar()+0x9b: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_read_guest_seg_selector()+0x96: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_read_guest_seg_base()+0x9b: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_segment()+0x2da: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmwrite_error()+0x161: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: exec_controls_set.isra.0()+0x5a: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_dr()+0x1bc: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: update_exception_bitmap()+0x136: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_interrupt_shadow()+0x8b: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: skip_emulated_instruction()+0xe9: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_exception_nmi()+0x674: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_clear_hlt.isra.0()+0xe5: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_idt()+0x65: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_gdt()+0x65: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: seg_setup()+0x125: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_nmi_mask()+0x11c: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: __vmx_complete_interrupts()+0x167: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_task_switch()+0x34d: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_dr7()+0x1e: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: update_cr8_intercept()+0x1a2: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_hwapic_isr_update()+0x8a: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_rvi()+0x87: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_load_eoi_exitmap()+0x107: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_rflags()+0x20f: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: fix_rmode_seg()+0x1de: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_segment()+0x28b: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: enter_pmode()+0x1ad: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: enter_rmode()+0x27e: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_write_l1_tsc_offset()+0x11b: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_pml_full()+0x138: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_cancel_injection()+0x5d: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_queue_exception()+0x10d: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_inject_nmi()+0xd1: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_inject_irq()+0x127: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_ept_violation()+0x13e: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: enable_irq_window()+0x71: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_interrupt_window()+0x71: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_nmi_window()+0x92: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_sync_dirty_debug_regs()+0x203: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: enable_nmi_window()+0xca: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: clear_atomic_switch_msr()+0x2ba: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: add_atomic_switch_msr.constprop.0()+0x314: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_vcpu_run()+0xc16: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_host_fs_gs()+0x1f9: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_vcpu_load_vmcs()+0x404: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_cr4()+0x240: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_get_msr()+0x49d: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_cpuid_update()+0xc89: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: ept_save_pdptrs()+0x176: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_cache_reg()+0xe3: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_cr3()+0x47: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_apic_access_page_addr()+0x9f: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_efer()+0x22f: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_cr0()+0x15e: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: handle_cr()+0xe1d: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_vcpu_reset()+0x1a98: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_virtual_apic_mode()+0x216: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_refresh_apicv_exec_ctrl()+0x2e0: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_msr()+0xf26: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_set_constant_host_state()+0x364: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: set_cr4_guest_host_mask()+0xda: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: init_vmcs()+0x1705: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: dump_vmcs.cold()+0x193c: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_handle_exit()+0xcfc: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_update_host_rsp()+0x65: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_dump_dtsel()+0x5d: FPU instruction outside of kernel_fpu_{begin,end}()
arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_dump_sel()+0xda: FPU instruction outside of kernel_fpu_{begin,end}()
./objdump-func.sh defconfig-build/arch/x86/kvm/vmx/vmx.o ept_save_pdptrs | grep 176
0176 1d436: 41 0f 78 c4 vmread %rax,%r12
next prev parent reply other threads:[~2020-04-06 10:21 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 2:34 AMD DC graphics display code enables -mhard-float, -msse, -msse2 without any visible FPU state protection Jann Horn
2020-04-02 7:33 ` Christian König
2020-04-02 7:56 ` Jann Horn
2020-04-02 9:36 ` Thomas Gleixner
2020-04-02 14:50 ` Jann Horn
2020-04-02 14:13 ` Peter Zijlstra
2020-04-03 5:28 ` Masami Hiramatsu
2020-04-03 11:21 ` Peter Zijlstra
2020-04-04 3:08 ` Masami Hiramatsu
2020-04-04 3:15 ` Randy Dunlap
2020-04-04 8:32 ` Masami Hiramatsu
2020-04-04 14:32 ` Peter Zijlstra
2020-04-05 3:19 ` Masami Hiramatsu
2020-04-06 10:21 ` Peter Zijlstra [this message]
2020-04-07 9:50 ` Masami Hiramatsu
2020-04-07 11:15 ` Peter Zijlstra
2020-04-07 15:41 ` Masami Hiramatsu
2020-04-07 15:43 ` [PATCH] x86: insn: Add insn_is_fpu() Masami Hiramatsu
2020-04-07 15:54 ` AMD DC graphics display code enables -mhard-float, -msse, -msse2 without any visible FPU state protection Peter Zijlstra
2020-04-08 0:31 ` Masami Hiramatsu
2020-04-08 16:09 ` [PATCH v2] x86: insn: Add insn_is_fpu() Masami Hiramatsu
2020-04-09 14:32 ` Peter Zijlstra
2020-04-09 14:45 ` Peter Zijlstra
2020-04-10 0:47 ` Masami Hiramatsu
2020-04-10 1:22 ` [PATCH v3] " Masami Hiramatsu
2020-04-15 8:23 ` Masami Hiramatsu
2020-04-15 8:49 ` [PATCH v4] " Masami Hiramatsu
2020-04-04 14:36 ` AMD DC graphics display code enables -mhard-float, -msse, -msse2 without any visible FPU state protection Peter Zijlstra
2020-04-05 3:37 ` Masami Hiramatsu
2020-04-09 15:59 ` Peter Zijlstra
2020-04-09 17:09 ` Peter Zijlstra
2020-04-09 18:15 ` Christian König
2020-04-09 20:01 ` Peter Zijlstra
2020-04-10 14:31 ` Christian König
2020-04-15 9:16 ` Peter Zijlstra
2020-04-17 20:27 ` Rodrigo Siqueira
2020-04-17 21:56 ` Peter Zijlstra
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