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dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-669ff7000002311f-73-682af76d8185 From: Byungchul Park To: linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, harry.yoo@oracle.com, chris.p.wilson@intel.com, gwan-gyeong.mun@intel.com, max.byungchul.park@gmail.com, boqun.feng@gmail.com, longman@redhat.com, yskelg@gmail.com, yunseong.kim@ericsson.com, yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v16 08/42] x86_64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64 Date: Mon, 19 May 2025 18:17:52 +0900 Message-Id: <20250519091826.19752-9-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250519091826.19752-1-byungchul@sk.com> References: <20250519091826.19752-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSb0xTZxSH97739t7bSpebSuadLNvSxFRrhkLEnMw5TUzmm0zjEk00Ev80 cmObQTFFUEgWYVCtIuhMABVhBbFWKIKtJk4pKSWWgRlUqaUgVmXE2EklA1pWQVyr8cvJk/x+ 5zlfDkcpPJKlnE5/WDToNdlKRkbLwkkN3+hn1drVs11KiMyYaLjUZmPAe70Fge1mCYbQvc0w FJ1AMPfXAAU1VV4EDc+fUHDTE0TgtP7KwOD4p+CLTDLQW1XOQOnlNgYevJrHMFp9DkOLfSs8 tbyg4f7ZRgw1IQZqa0pxfLzEELM0s2ApXgZj1osszD9Pg96gXwLOkZVwoX6UgQ5nLw2e22MY Bu9cYiBoeyeB+54/aYhWpoD3twoJtL5uZOBV1EKBJTLJwkOXGYPH/Bm0l8WFx6cXJNBT4cJw vOkGBt/wXQSdpmcY7DY/A92RCQwOexUFb67eQzBWGWbBeDrGQm1JJYJyYzUNZaMZMPdf/HLd TBqU/N5OQ+tbP9q4ntjqbYh0T0xSpMxxhLyJPGKIM2qmSV+jQP64+IQlZZ0jLDHb84nDqiaX O0KYNExFJMTefJIh9qlzLDkV9mHyur+f/emL3bLvssRsXYFoWPX9fpn2cV2YPtSXfHSu9Apd jP7hTyEpJ/BrhPMNLslHDnTcYhPM8CohEIhRCU7mvxYcFS/iHRlH8f5FwlDdMEoEi/lM4d9b 8/GA42h+mWAqwQmU8xnCeFfBB+VXQku7671Gyq8VRsq7328q4hVfSz2dUAr8Gakw3XkBf1j4 XOiyBuizSG5GnzQjhU5fkKPRZa9J1RbqdUdTD+Tm2FH8uyy/zGfeRlPe7W7Ec0iZJG93rtAq JJqCvMIcNxI4Spksb3Ys1yrkWZrCItGQu8+Qny3muVEKRyuXyNOjR7IU/EHNYfFnUTwkGj6m mJMuLUY6FzUrS43tcI+GTE2nxSzP32jymtmY2ipN2WnsH3DvUjfe+DbT7lNdq1ZvNIV+2BqM 3Vmxtzpj3Vy4bZO2SMVsf7DamGRUWf2Ltjg3BGYGVEXnmR/3kKlNV4bagmq+78uFLdu8uTsX Tkw/Xb9uW/2CkIZ7nD3p47XHBnbLm04q6TytJk1NGfI0/wNg7ldfWQMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAAzWSf0zMcRjHfb6/O46vc+M7MXaWCEemPBuzbI3PGGNjNjYcfeeOLnbHKWMr V9YP3bBVox+u4pw67rrL5kdnqTmSH9FJkqhhohPqjroLF/PPs9f2ej/v55+HI2VWeiqnSTko 6lJUyQpGQknWLzMu0P6IUS9yZSvAP5hNQYndxkDL1WoEttoMAnrvroYXgT4EwUdPSCgqaEFQ 3v2ahFpPFwK39TgDre/Gg9ffz0BTQR4Dxko7A08/hwjoLDxDQLVzHbyxfKCg+VQFAUW9DBQX GYnw+EjAkKWKBUt6FPRYz7EQ6o6Fpq42GhpLm2hwd8yDs2WdDNS5myjwXO8hoPVmCQNdtt80 NHvuUxAwRULL6XwarnypYOBzwEKCxd/PwrN6MwEe82RwZIZbTwz8ouFefj0BJy7UEOB9eQvB 7ey3BDhtbQw0+vsIcDkLSBi+dBdBj8nHQtbJIRaKM0wI8rIKKcjsjIPgz/Dl0sFYyDjvoODK SBtKWIFtZTaEG/v6SZzpOoyH/c8Z7A6YKfygQsA3zr1mcebtDhabnYewyxqDK+t6CVz+3U9j Z1UOg53fz7A41+cl8JfHj9kN07dKlieJyRqDqFu4YqdE/arURx14IE8NGi9S6egTn4siOIFf IrTXXWNHmeGjhfb2IXKU5fxMwZX/gc5FEo7k28YKL0pfolExid8mfLsWCguOo/goITuDGEUp Hye8u2P4VzlDqHbU/62J4OOFjrzGv5uycMRbXUadQhIzGlOF5JoUg1alSY5T6vep01I0qcrd +7VOFP4fy7HQ6etosHV1A+I5pBgndbjnqmW0yqBP0zYggSMVcmmVa45aJk1SpR0Rdft36A4l i/oGFMlRiinSNVvEnTJ+j+qguE8UD4i6/5bgIqamI/zUdGvDZqNyYtSRtb7iHwni+HX2EV9s 0F2jc5giQ0MrN80ernXl7B1mXy2YMC7AQGGJtyOk3POevPwV7VrcPf9OUbmk9WgoLlHuGVH+ zJrV2ZyUmBNvt6Z6J22fG7QvG3g/7WL0ItNbJnHLQy7qmWKpNt4+Tbpx/kCCYVXCp70KSq9W xcaQOr3qD0hkd0M7AwAA X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" dept needs to notice every entrance from user to kernel mode to treat every kernel context independently when tracking wait-event dependencies. Roughly, system call and user oriented fault are the cases. Make dept aware of the entrances of x86_64 and add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64. Signed-off-by: Byungchul Park --- arch/x86/Kconfig | 1 + arch/x86/entry/syscall_64.c | 7 +++++++ arch/x86/mm/fault.c | 7 +++++++ 3 files changed, 15 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5873c9e39919..4b6d9e59d96c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -38,6 +38,7 @@ config X86_64 select ARCH_HAS_ELFCORE_COMPAT select ZONE_DMA32 select EXECMEM if DYNAMIC_FTRACE + select ARCH_HAS_DEPT_SUPPORT =20 config FORCE_DYNAMIC_FTRACE def_bool y diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c index b6e68ea98b83..66bd5af5aff1 100644 --- a/arch/x86/entry/syscall_64.c +++ b/arch/x86/entry/syscall_64.c @@ -8,6 +8,7 @@ #include #include #include +#include =20 #define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *); #define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(con= st struct pt_regs *); @@ -86,6 +87,12 @@ static __always_inline bool do_syscall_x32(struct pt_reg= s *regs, int nr) /* Returns true to return using SYSRET, or false to use IRET */ __visible noinstr bool do_syscall_64(struct pt_regs *regs, int nr) { + /* + * This is a system call from user mode. Make dept work with a + * new kernel mode context. + */ + dept_update_cxt(); + add_random_kstack_offset(); nr =3D syscall_enter_from_user_mode(regs, nr); =20 diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 296d294142c8..241537ce47fe 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -20,6 +20,7 @@ #include #include /* find_and_lock_vma() */ #include +#include =20 #include /* boot_cpu_has, ... */ #include /* dotraplinkage, ... */ @@ -1220,6 +1221,12 @@ void do_user_addr_fault(struct pt_regs *regs, tsk =3D current; mm =3D tsk->mm; =20 + /* + * This fault comes from user mode. Make dept work with a new + * kernel mode context. + */ + dept_update_cxt(); + if (unlikely((error_code & (X86_PF_USER | X86_PF_INSTR)) =3D=3D X86_PF_IN= STR)) { /* * Whoops, this is kernel mode code trying to execute from --=20 2.17.1