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Shutemov" To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org Cc: sathyanarayanan.kuppuswamy@linux.intel.com, aarcange@redhat.com, ak@linux.intel.com, dan.j.williams@intel.com, david@redhat.com, hpa@zytor.com, jgross@suse.com, jmattson@google.com, joro@8bytes.org, jpoimboe@redhat.com, knsathya@kernel.org, pbonzini@redhat.com, sdeep@vmware.com, seanjc@google.com, tony.luck@intel.com, vkuznets@redhat.com, wanpengli@tencent.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, x86@kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Dave Hansen Subject: [PATCHv8 06/30] x86/traps: Refactor exc_general_protection() Date: Wed, 6 Apr 2022 02:29:15 +0300 Message-Id: <20220405232939.73860-7-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405232939.73860-1-kirill.shutemov@linux.intel.com> References: <20220405232939.73860-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org TDX brings a new exception -- Virtualization Exception (#VE). Handling of #VE structurally very similar to handling #GP. Extract two helpers from exc_general_protection() that can be reused for handling #VE. No functional changes. Suggested-by: Thomas Gleixner Signed-off-by: Kirill A. Shutemov Reviewed-by: Dave Hansen --- arch/x86/kernel/traps.c | 57 ++++++++++++++++++++++------------------- 1 file changed, 31 insertions(+), 26 deletions(-) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 1563fb995005..db8d22a0d003 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -686,13 +686,40 @@ static bool try_fixup_enqcmd_gp(void) #endif } +static bool gp_try_fixup_and_notify(struct pt_regs *regs, int trapnr, + unsigned long error_code, const char *str) +{ + if (fixup_exception(regs, trapnr, error_code, 0)) + return true; + + current->thread.error_code = error_code; + current->thread.trap_nr = trapnr; + + /* + * To be potentially processing a kprobe fault and to trust the result + * from kprobe_running(), we have to be non-preemptible. + */ + if (!preemptible() && kprobe_running() && + kprobe_fault_handler(regs, trapnr)) + return true; + + return notify_die(DIE_GPF, str, regs, error_code, trapnr, SIGSEGV) == NOTIFY_STOP; +} + +static void gp_user_force_sig_segv(struct pt_regs *regs, int trapnr, + unsigned long error_code, const char *str) +{ + current->thread.error_code = error_code; + current->thread.trap_nr = trapnr; + show_signal(current, SIGSEGV, "", str, regs, error_code); + force_sig(SIGSEGV); +} + DEFINE_IDTENTRY_ERRORCODE(exc_general_protection) { char desc[sizeof(GPFSTR) + 50 + 2*sizeof(unsigned long) + 1] = GPFSTR; enum kernel_gp_hint hint = GP_NO_HINT; - struct task_struct *tsk; unsigned long gp_addr; - int ret; if (user_mode(regs) && try_fixup_enqcmd_gp()) return; @@ -711,40 +738,18 @@ DEFINE_IDTENTRY_ERRORCODE(exc_general_protection) return; } - tsk = current; - if (user_mode(regs)) { if (fixup_iopl_exception(regs)) goto exit; - tsk->thread.error_code = error_code; - tsk->thread.trap_nr = X86_TRAP_GP; - if (fixup_vdso_exception(regs, X86_TRAP_GP, error_code, 0)) goto exit; - show_signal(tsk, SIGSEGV, "", desc, regs, error_code); - force_sig(SIGSEGV); + gp_user_force_sig_segv(regs, X86_TRAP_GP, error_code, desc); goto exit; } - if (fixup_exception(regs, X86_TRAP_GP, error_code, 0)) - goto exit; - - tsk->thread.error_code = error_code; - tsk->thread.trap_nr = X86_TRAP_GP; - - /* - * To be potentially processing a kprobe fault and to trust the result - * from kprobe_running(), we have to be non-preemptible. - */ - if (!preemptible() && - kprobe_running() && - kprobe_fault_handler(regs, X86_TRAP_GP)) - goto exit; - - ret = notify_die(DIE_GPF, desc, regs, error_code, X86_TRAP_GP, SIGSEGV); - if (ret == NOTIFY_STOP) + if (gp_try_fixup_and_notify(regs, X86_TRAP_GP, error_code, desc)) goto exit; if (error_code) -- 2.35.1