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yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v15 08/43] x86_64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64 Date: Tue, 13 May 2025 19:06:55 +0900 Message-Id: <20250513100730.12664-9-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250513100730.12664-1-byungchul@sk.com> References: <20250513100730.12664-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSf0yMcRzHfZ/nued5Op09O60eMj/O7yjOwmeG+TlPYtPMJmXc9NTdVHKX fthYp6McJaaiX65wpS7qyuRHLZnTj8nRqSShEamrKXeTfnDV/PPZa+/3e+/PP28aF5sEM2lF eCSvDJeFSkghIbQ653r2zZgvX/k1eznYfiUSkHXPQIL5bhECQ7kag+7nO6DF3otg+OUrHNJT zQhyP3/AodzUgaCy4AwJTV+mgcXWT0Jd6gUS4m/eI+F1zwgG7WlXMCgy7oaP+i4CGlLyMEjv JiEzPR5znO8YDOkLKdDHLYTOggwKRj5Loa6jWQCVbcvgek47CU8q6wgwVXRi0PQoi4QOw18B NJhqCbAnu4P5cpIAivvySOix63HQ2/opeFOtw8Ckc4USjaPw3OCYAF4kVWNw7lYpBpZ3jxFU JX7CwGhoJuGZrReDMmMqDn/ynyPoTLZScPbiEAWZ6mQEF86mEaBpXw3Dvx2fs39JQX2jhIDi 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 wSwoNtEH CoxOa4qzRMg24nQqCGm5MMDpbjndJy0dNpjErJY1kTcSnylIDx290nCD/it28dpjdZKVEDQHDbu+/fC2JYMg+EFNhqBiEFHz8JNQkHdEMklah3WbvZMZAduIC7qqJipj2qNnIq6i4N+2qOzO3FepCc1ABuA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 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 #define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *); #define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(const struct pt_regs *); @@ -86,6 +87,12 @@ static __always_inline bool do_syscall_x32(struct pt_regs *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 = syscall_enter_from_user_mode(regs, nr); 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 #include /* boot_cpu_has, ... */ #include /* dotraplinkage, ... */ @@ -1220,6 +1221,12 @@ void do_user_addr_fault(struct pt_regs *regs, tsk = current; mm = tsk->mm; + /* + * 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)) == X86_PF_INSTR)) { /* * Whoops, this is kernel mode code trying to execute from -- 2.17.1