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In order to facilitate parallel startup, start to eliminate some of the global variables passing information to CPUs in the startup path. However, start by introducing one more: smpboot_control. For now this merely holds the CPU# of the CPU which is coming up. Each CPU can then find its own per-cpu data, and everything else it needs can be found from there, allowing the other global variables to be removed. First to be removed is initial_stack. Each CPU can load %rsp from its current_task->thread.sp instead. That is already set up with the correct idle thread for APs. Set up the .sp field in INIT_THREAD on x86 so that the BSP also finds a suitable stack pointer in the static per-cpu data when coming up on first boot. On resume from S3, the CPU needs a temporary stack because its idle task is already active. Instead of setting initial_stack, the sleep code can simply set its own current->thread.sp to point to the temporary stack. Nobody else cares about ->thread.sp for a thread which is currently on a CPU, because the true value is actually in the %rsp register. Which is restored with the rest of the CPU context in do_suspend_lowlevel(). Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Usama Arif <usama.arif@bytedance.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Usama Arif <usama.arif@bytedance.com> Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Reviewed-by: David Woodhouse <dwmw@amazon.co.uk> Link: https://lore.kernel.org/r/20230316222109.1940300-7-usama.arif@bytedance.com
131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed to extract
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* and format the required data.
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*/
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#define COMPILE_OFFSETS
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#include <linux/crypto.h>
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#include <crypto/aria.h>
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#include <linux/sched.h>
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#include <linux/stddef.h>
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#include <linux/hardirq.h>
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#include <linux/suspend.h>
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#include <linux/kbuild.h>
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#include <asm/processor.h>
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#include <asm/thread_info.h>
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#include <asm/sigframe.h>
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#include <asm/bootparam.h>
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#include <asm/suspend.h>
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#include <asm/tlbflush.h>
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#include <asm/tdx.h>
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#ifdef CONFIG_XEN
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#include <xen/interface/xen.h>
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#endif
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#ifdef CONFIG_X86_32
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# include "asm-offsets_32.c"
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#else
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# include "asm-offsets_64.c"
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#endif
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static void __used common(void)
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{
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BLANK();
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OFFSET(TASK_threadsp, task_struct, thread.sp);
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#ifdef CONFIG_STACKPROTECTOR
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OFFSET(TASK_stack_canary, task_struct, stack_canary);
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#endif
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BLANK();
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OFFSET(pbe_address, pbe, address);
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OFFSET(pbe_orig_address, pbe, orig_address);
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OFFSET(pbe_next, pbe, next);
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#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
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BLANK();
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OFFSET(IA32_SIGCONTEXT_ax, sigcontext_32, ax);
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OFFSET(IA32_SIGCONTEXT_bx, sigcontext_32, bx);
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OFFSET(IA32_SIGCONTEXT_cx, sigcontext_32, cx);
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OFFSET(IA32_SIGCONTEXT_dx, sigcontext_32, dx);
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OFFSET(IA32_SIGCONTEXT_si, sigcontext_32, si);
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OFFSET(IA32_SIGCONTEXT_di, sigcontext_32, di);
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OFFSET(IA32_SIGCONTEXT_bp, sigcontext_32, bp);
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OFFSET(IA32_SIGCONTEXT_sp, sigcontext_32, sp);
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OFFSET(IA32_SIGCONTEXT_ip, sigcontext_32, ip);
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BLANK();
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OFFSET(IA32_RT_SIGFRAME_sigcontext, rt_sigframe_ia32, uc.uc_mcontext);
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#endif
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#ifdef CONFIG_XEN
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BLANK();
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OFFSET(XEN_vcpu_info_mask, vcpu_info, evtchn_upcall_mask);
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OFFSET(XEN_vcpu_info_pending, vcpu_info, evtchn_upcall_pending);
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OFFSET(XEN_vcpu_info_arch_cr2, vcpu_info, arch.cr2);
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#endif
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BLANK();
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OFFSET(TDX_MODULE_rcx, tdx_module_output, rcx);
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OFFSET(TDX_MODULE_rdx, tdx_module_output, rdx);
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OFFSET(TDX_MODULE_r8, tdx_module_output, r8);
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OFFSET(TDX_MODULE_r9, tdx_module_output, r9);
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OFFSET(TDX_MODULE_r10, tdx_module_output, r10);
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OFFSET(TDX_MODULE_r11, tdx_module_output, r11);
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BLANK();
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OFFSET(TDX_HYPERCALL_r8, tdx_hypercall_args, r8);
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OFFSET(TDX_HYPERCALL_r9, tdx_hypercall_args, r9);
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OFFSET(TDX_HYPERCALL_r10, tdx_hypercall_args, r10);
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OFFSET(TDX_HYPERCALL_r11, tdx_hypercall_args, r11);
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OFFSET(TDX_HYPERCALL_r12, tdx_hypercall_args, r12);
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OFFSET(TDX_HYPERCALL_r13, tdx_hypercall_args, r13);
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OFFSET(TDX_HYPERCALL_r14, tdx_hypercall_args, r14);
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OFFSET(TDX_HYPERCALL_r15, tdx_hypercall_args, r15);
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OFFSET(TDX_HYPERCALL_rdi, tdx_hypercall_args, rdi);
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OFFSET(TDX_HYPERCALL_rsi, tdx_hypercall_args, rsi);
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OFFSET(TDX_HYPERCALL_rbx, tdx_hypercall_args, rbx);
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OFFSET(TDX_HYPERCALL_rdx, tdx_hypercall_args, rdx);
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BLANK();
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OFFSET(BP_scratch, boot_params, scratch);
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OFFSET(BP_secure_boot, boot_params, secure_boot);
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OFFSET(BP_loadflags, boot_params, hdr.loadflags);
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OFFSET(BP_hardware_subarch, boot_params, hdr.hardware_subarch);
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OFFSET(BP_version, boot_params, hdr.version);
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OFFSET(BP_kernel_alignment, boot_params, hdr.kernel_alignment);
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OFFSET(BP_init_size, boot_params, hdr.init_size);
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OFFSET(BP_pref_address, boot_params, hdr.pref_address);
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BLANK();
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DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
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/* TLB state for the entry code */
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OFFSET(TLB_STATE_user_pcid_flush_mask, tlb_state, user_pcid_flush_mask);
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/* Layout info for cpu_entry_area */
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OFFSET(CPU_ENTRY_AREA_entry_stack, cpu_entry_area, entry_stack_page);
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DEFINE(SIZEOF_entry_stack, sizeof(struct entry_stack));
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DEFINE(MASK_entry_stack, (~(sizeof(struct entry_stack) - 1)));
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/* Offset for fields in tss_struct */
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OFFSET(TSS_sp0, tss_struct, x86_tss.sp0);
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OFFSET(TSS_sp1, tss_struct, x86_tss.sp1);
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OFFSET(TSS_sp2, tss_struct, x86_tss.sp2);
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OFFSET(X86_top_of_stack, pcpu_hot, top_of_stack);
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OFFSET(X86_current_task, pcpu_hot, current_task);
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#ifdef CONFIG_CALL_DEPTH_TRACKING
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OFFSET(X86_call_depth, pcpu_hot, call_depth);
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#endif
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#if IS_ENABLED(CONFIG_CRYPTO_ARIA_AESNI_AVX_X86_64)
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/* Offset for fields in aria_ctx */
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BLANK();
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OFFSET(ARIA_CTX_enc_key, aria_ctx, enc_key);
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OFFSET(ARIA_CTX_dec_key, aria_ctx, dec_key);
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OFFSET(ARIA_CTX_rounds, aria_ctx, rounds);
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#endif
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}
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