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[34.86.254.150]) by smtp.gmail.com with ESMTPSA id d27-20020a05620a137b00b00788228fbe05sm2851589qkl.17.2024.03.11.09.46.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Mar 2024 09:46:54 -0700 (PDT) From: Pasha Tatashin To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, x86@kernel.org, bp@alien8.de, brauner@kernel.org, bristot@redhat.com, bsegall@google.com, dave.hansen@linux.intel.com, dianders@chromium.org, dietmar.eggemann@arm.com, eric.devolder@oracle.com, hca@linux.ibm.com, hch@infradead.org, hpa@zytor.com, jacob.jun.pan@linux.intel.com, jgg@ziepe.ca, jpoimboe@kernel.org, jroedel@suse.de, juri.lelli@redhat.com, kent.overstreet@linux.dev, kinseyho@google.com, kirill.shutemov@linux.intel.com, lstoakes@gmail.com, luto@kernel.org, mgorman@suse.de, mic@digikod.net, michael.christie@oracle.com, mingo@redhat.com, mjguzik@gmail.com, mst@redhat.com, npiggin@gmail.com, peterz@infradead.org, pmladek@suse.com, rick.p.edgecombe@intel.com, rostedt@goodmis.org, surenb@google.com, tglx@linutronix.de, urezki@gmail.com, vincent.guittot@linaro.org, vschneid@redhat.com, pasha.tatashin@soleen.com Subject: [RFC 11/14] x86: add support for Dynamic Kernel Stacks Date: Mon, 11 Mar 2024 16:46:35 +0000 Message-ID: <20240311164638.2015063-12-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.44.0.278.ge034bb2e1d-goog In-Reply-To: <20240311164638.2015063-1-pasha.tatashin@soleen.com> References: <20240311164638.2015063-1-pasha.tatashin@soleen.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add dynamic_stack_fault() calls to the kernel faults, and also declare HAVE_ARCH_DYNAMIC_STACK =3D y, so that dynamic kernel stacks can be enabled on x86 architecture. Signed-off-by: Pasha Tatashin --- arch/x86/Kconfig | 1 + arch/x86/kernel/traps.c | 3 +++ arch/x86/mm/fault.c | 3 +++ 3 files changed, 7 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5edec175b9bf..9bb0da3110fa 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -197,6 +197,7 @@ config X86 select HAVE_ARCH_USERFAULTFD_WP if X86_64 && USERFAULTFD select HAVE_ARCH_USERFAULTFD_MINOR if X86_64 && USERFAULTFD select HAVE_ARCH_VMAP_STACK if X86_64 + select HAVE_ARCH_DYNAMIC_STACK if X86_64 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET select HAVE_ARCH_WITHIN_STACK_FRAMES select HAVE_ASM_MODVERSIONS diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index c3b2f863acf0..cc05401e729f 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -413,6 +413,9 @@ DEFINE_IDTENTRY_DF(exc_double_fault) } #endif =20 + if (dynamic_stack_fault(current, address)) + return; + irqentry_nmi_enter(regs); instrumentation_begin(); notify_die(DIE_TRAP, str, regs, error_code, X86_TRAP_DF, SIGSEGV); diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index d6375b3c633b..651c558b10eb 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -1198,6 +1198,9 @@ do_kern_addr_fault(struct pt_regs *regs, unsigned lon= g hw_error_code, if (is_f00f_bug(regs, hw_error_code, address)) return; =20 + if (dynamic_stack_fault(current, address)) + return; + /* Was the fault spurious, caused by lazy TLB invalidation? */ if (spurious_kernel_fault(hw_error_code, address)) return; --=20 2.44.0.278.ge034bb2e1d-goog