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Mon, 30 Aug 2021 05:55:03 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap1.suse-dmz.suse.de with ESMTPSA id gBW7C7dyLGHkAwAAGKfGzw (envelope-from ); Mon, 30 Aug 2021 05:55:03 +0000 Subject: Re: [PATCH v2 01/24] x86/xen: Mark cpu_bringup_and_idle() as dead_end_function From: Juergen Gross To: Josh Poimboeuf , Peter Zijlstra Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org, joro@8bytes.org, boris.ostrovsky@oracle.com, x86@kernel.org, mbenes@suse.com, rostedt@goodmis.org, dvyukov@google.com, elver@google.com References: <20210624094059.886075998@infradead.org> <20210624095147.693801717@infradead.org> <20210820192224.ytrr6ybuuwegbeov@treble> <20210820193107.omvshmsqbpxufzkc@treble> Message-ID: Date: Mon, 30 Aug 2021 07:55:02 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="R3w276Ku5DYLI3cc7w1fvDKGJnQXNQX8d" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --R3w276Ku5DYLI3cc7w1fvDKGJnQXNQX8d Content-Type: multipart/mixed; boundary="LKKdSb67ebz4m22FCw0tNCzSbIS3iUIMu"; protected-headers="v1" From: Juergen Gross To: Josh Poimboeuf , Peter Zijlstra Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org, joro@8bytes.org, boris.ostrovsky@oracle.com, x86@kernel.org, mbenes@suse.com, rostedt@goodmis.org, dvyukov@google.com, elver@google.com Message-ID: Subject: Re: [PATCH v2 01/24] x86/xen: Mark cpu_bringup_and_idle() as dead_end_function References: <20210624094059.886075998@infradead.org> <20210624095147.693801717@infradead.org> <20210820192224.ytrr6ybuuwegbeov@treble> <20210820193107.omvshmsqbpxufzkc@treble> In-Reply-To: --LKKdSb67ebz4m22FCw0tNCzSbIS3iUIMu Content-Type: multipart/mixed; boundary="------------73F28B25A81701316A2B8CEE" Content-Language: en-US This is a multi-part message in MIME format. --------------73F28B25A81701316A2B8CEE Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 23.08.21 10:40, Juergen Gross wrote: > On 20.08.21 21:31, Josh Poimboeuf wrote: >> On Fri, Aug 20, 2021 at 12:22:28PM -0700, Josh Poimboeuf wrote: >>> On Thu, Jun 24, 2021 at 11:41:00AM +0200, Peter Zijlstra wrote: >>>> The asm_cpu_bringup_and_idle() function is required to push the retu= rn >>>> value on the stack in order to make ORC happy, but the only reason >>>> objtool doesn't complain is because of a happy accident. >>>> >>>> The thing is that asm_cpu_bringup_and_idle() doesn't return, so >>>> validate_branch() never terminates and falls through to the next >>>> function, which in the normal case is the hypercall_page. And that, = as >>>> it happens, is 4095 NOPs and a RET. >>>> >>>> Make asm_cpu_bringup_and_idle() terminate on it's own, by making the= >>>> function it calls as a dead-end. This way we no longer rely on what >>>> code happens to come after. >>>> >>>> Fixes: c3881eb58d56 ("x86/xen: Make the secondary CPU idle tasks=20 >>>> reliable") >>>> Signed-off-by: Peter Zijlstra (Intel) >>> >>> Looks right.=C2=A0 Only problem is, with my assembler I get this: >>> >>> =C2=A0=C2=A0 arch/x86/kernel/head_64.o: warning: objtool: .text+0x5: = >>> unreachable instruction >>> >>> Because gas insists on jumping over the page of nops... >>> >>> 0000000000000000 : >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0:=C2=A0=C2=A0=C2=A0 e8 00= 00 00 00=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cal= lq=C2=A0 5=20 >>> >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1:= R_X86_64_PLT32=C2=A0=C2=A0=C2=A0 cpu_bringup_and_idle-0x4 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5:=C2=A0=C2=A0=C2=A0 e9 f6= 0f 00 00=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 jmp= q=C2=A0=C2=A0 1000=20 >>> >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 a:=C2=A0=C2=A0=C2=A0 66 66= 2e 0f 1f 84 00=C2=A0=C2=A0=C2=A0=C2=A0 data16 nopw %cs:0x0(%rax,%rax,1) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 11:=C2=A0=C2=A0=C2=A0 00 00 00 0= 0 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 15:=C2=A0=C2=A0=C2=A0 66 66 2e 0= f 1f 84 00=C2=A0=C2=A0=C2=A0=C2=A0 data16 nopw %cs:0x0(%rax,%rax,1) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1c:=C2=A0=C2=A0=C2=A0 00 00 00 0= 0 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 20:=C2=A0=C2=A0=C2=A0 66 66 2e 0= f 1f 84 00=C2=A0=C2=A0=C2=A0=C2=A0 data16 nopw %cs:0x0(%rax,%rax,1) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 27:=C2=A0=C2=A0=C2=A0 00 00 00 0= 0 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 2b:=C2=A0=C2=A0=C2=A0 66 66 2e 0= f 1f 84 00=C2=A0=C2=A0=C2=A0=C2=A0 data16 nopw %cs:0x0(%rax,%rax,1) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 32:=C2=A0=C2=A0=C2=A0 00 00 00 0= 0 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 36:=C2=A0=C2=A0=C2=A0 66 66 2e 0= f 1f 84 00=C2=A0=C2=A0=C2=A0=C2=A0 data16 nopw %cs:0x0(%rax,%rax,1) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3d:=C2=A0=C2=A0=C2=A0 00 00 00 0= 0 >> >> Here's a fix: >> >> From: Josh Poimboeuf >> Subject: [PATCH] x86/xen: Move hypercall_page to top of the file >> >> Because hypercall_page is page-aligned, the assembler inexplicably add= s >> an unreachable jump from after the end of the previous code to the >> beginning of hypercall_page. >> >> That confuses objtool, understandably.=C2=A0 It also creates significa= nt text >> fragmentation.=C2=A0 As a result, much of the object file is wasted te= xt >> (nops). >> >> Move hypercall_page to the beginning of the file to both prevent the >> text fragmentation and avoid the dead jump instruction. >> >> $ size /tmp/head_64.before.o /tmp/head_64.after.o >> =C2=A0=C2=A0=C2=A0 text=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 data=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bss=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 dec=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hex=C2=A0=C2=A0=C2= =A0 filename >> =C2=A0=C2=A0 10924=C2=A0=C2=A0=C2=A0=C2=A0 307252=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 4096=C2=A0=C2=A0=C2=A0=C2=A0 322272=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 4eae0 =20 >> /tmp/head_64.before.o >> =C2=A0=C2=A0=C2=A0 6823=C2=A0=C2=A0=C2=A0=C2=A0 307252=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 4096=C2=A0=C2=A0=C2=A0=C2=A0 318171=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 4dadb =20 >> /tmp/head_64.after.o >> >> Signed-off-by: Josh Poimboeuf =20 > Reviewed-by: Juergen Gross Umm, will this be carried through the tip tree, or shall I take it in the xen tree? Juergen >=20 >=20 > Juergen >=20 >> --- >> =C2=A0 arch/x86/xen/xen-head.S | 34 +++++++++++++++++-----------------= >> =C2=A0 1 file changed, 17 insertions(+), 17 deletions(-) >> >> diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S >> index cb6538ae2fe0..488944d6d430 100644 >> --- a/arch/x86/xen/xen-head.S >> +++ b/arch/x86/xen/xen-head.S >> @@ -20,6 +20,23 @@ >> =C2=A0 #include >> =C2=A0 #include >> +.pushsection .text >> +=C2=A0=C2=A0=C2=A0 .balign PAGE_SIZE >> +SYM_CODE_START(hypercall_page) >> +=C2=A0=C2=A0=C2=A0 .rept (PAGE_SIZE / 32) >> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 UNWIND_HINT_FUNC >> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .skip 31, 0x90 >> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret >> +=C2=A0=C2=A0=C2=A0 .endr >> + >> +#define HYPERCALL(n) \ >> +=C2=A0=C2=A0=C2=A0 .equ xen_hypercall_##n, hypercall_page + __HYPERVI= SOR_##n * 32; \ >> +=C2=A0=C2=A0=C2=A0 .type xen_hypercall_##n, @function; .size xen_hype= rcall_##n, 32 >> +#include >> +#undef HYPERCALL >> +SYM_CODE_END(hypercall_page) >> +.popsection >> + >> =C2=A0 #ifdef CONFIG_XEN_PV >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 __INIT >> =C2=A0 SYM_CODE_START(startup_xen) >> @@ -64,23 +81,6 @@ SYM_CODE_END(asm_cpu_bringup_and_idle) >> =C2=A0 #endif >> =C2=A0 #endif >> -.pushsection .text >> -=C2=A0=C2=A0=C2=A0 .balign PAGE_SIZE >> -SYM_CODE_START(hypercall_page) >> -=C2=A0=C2=A0=C2=A0 .rept (PAGE_SIZE / 32) >> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 UNWIND_HINT_FUNC >> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 .skip 31, 0x90 >> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret >> -=C2=A0=C2=A0=C2=A0 .endr >> - >> -#define HYPERCALL(n) \ >> -=C2=A0=C2=A0=C2=A0 .equ xen_hypercall_##n, hypercall_page + __HYPERVI= SOR_##n * 32; 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