x86/xen: Rework the xen_{cpu,irq,mmu}_opsarrays
In order to allow objtool to make sense of all the various paravirt
functions, it needs to either parse whole pv_ops[] tables, or observe
individual assignments in the form:
bf87: 48 c7 05 00 00 00 00 00 00 00 00 movq $0x0,0x0(%rip)
bf92 <xen_init_spinlocks+0x5f>
bf8a: R_X86_64_PC32 pv_ops+0x268
As is, xen_cpu_ops[] is at offset +0 in pv_ops[] and could thus be
parsed as a 'normal' pv_ops[] table, however xen_irq_ops[] and
xen_mmu_ops[] are not.
Worse, both the latter two are compiled into the individual assignment
for by current GCC, but that's not something one can rely on.
Therefore, convert all three into full pv_ops[] tables. This has the
benefit of not needing to teach objtool about the offsets and
resulting in more conservative code-gen.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20210624095149.057262522@infradead.org
This commit is contained in:
Peter Zijlstra
Родитель
847d9317b2
Коммит
1462eb381b
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@ -1050,52 +1050,54 @@ static const struct pv_info xen_info __initconst = {
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.name = "Xen",
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};
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static const struct pv_cpu_ops xen_cpu_ops __initconst = {
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.cpuid = xen_cpuid,
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static const typeof(pv_ops) xen_cpu_ops __initconst = {
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.cpu = {
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.cpuid = xen_cpuid,
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.set_debugreg = xen_set_debugreg,
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.get_debugreg = xen_get_debugreg,
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.set_debugreg = xen_set_debugreg,
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.get_debugreg = xen_get_debugreg,
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.read_cr0 = xen_read_cr0,
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.write_cr0 = xen_write_cr0,
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.read_cr0 = xen_read_cr0,
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.write_cr0 = xen_write_cr0,
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.write_cr4 = xen_write_cr4,
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.write_cr4 = xen_write_cr4,
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.wbinvd = native_wbinvd,
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.wbinvd = native_wbinvd,
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.read_msr = xen_read_msr,
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.write_msr = xen_write_msr,
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.read_msr = xen_read_msr,
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.write_msr = xen_write_msr,
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.read_msr_safe = xen_read_msr_safe,
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.write_msr_safe = xen_write_msr_safe,
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.read_msr_safe = xen_read_msr_safe,
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.write_msr_safe = xen_write_msr_safe,
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.read_pmc = xen_read_pmc,
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.read_pmc = xen_read_pmc,
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.load_tr_desc = paravirt_nop,
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.set_ldt = xen_set_ldt,
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.load_gdt = xen_load_gdt,
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.load_idt = xen_load_idt,
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.load_tls = xen_load_tls,
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.load_gs_index = xen_load_gs_index,
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.load_tr_desc = paravirt_nop,
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.set_ldt = xen_set_ldt,
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.load_gdt = xen_load_gdt,
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.load_idt = xen_load_idt,
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.load_tls = xen_load_tls,
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.load_gs_index = xen_load_gs_index,
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.alloc_ldt = xen_alloc_ldt,
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.free_ldt = xen_free_ldt,
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.alloc_ldt = xen_alloc_ldt,
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.free_ldt = xen_free_ldt,
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.store_tr = xen_store_tr,
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.store_tr = xen_store_tr,
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.write_ldt_entry = xen_write_ldt_entry,
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.write_gdt_entry = xen_write_gdt_entry,
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.write_idt_entry = xen_write_idt_entry,
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.load_sp0 = xen_load_sp0,
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.write_ldt_entry = xen_write_ldt_entry,
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.write_gdt_entry = xen_write_gdt_entry,
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.write_idt_entry = xen_write_idt_entry,
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.load_sp0 = xen_load_sp0,
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#ifdef CONFIG_X86_IOPL_IOPERM
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.invalidate_io_bitmap = xen_invalidate_io_bitmap,
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.update_io_bitmap = xen_update_io_bitmap,
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.invalidate_io_bitmap = xen_invalidate_io_bitmap,
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.update_io_bitmap = xen_update_io_bitmap,
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#endif
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.io_delay = xen_io_delay,
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.io_delay = xen_io_delay,
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.start_context_switch = paravirt_start_context_switch,
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.end_context_switch = xen_end_context_switch,
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.start_context_switch = paravirt_start_context_switch,
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.end_context_switch = xen_end_context_switch,
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},
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};
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static void xen_restart(char *msg)
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@ -1231,7 +1233,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
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/* Install Xen paravirt ops */
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pv_info = xen_info;
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pv_ops.cpu = xen_cpu_ops;
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pv_ops.cpu = xen_cpu_ops.cpu;
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paravirt_iret = xen_iret;
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xen_init_irq_ops();
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@ -94,17 +94,20 @@ static void xen_halt(void)
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xen_safe_halt();
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}
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static const struct pv_irq_ops xen_irq_ops __initconst = {
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.save_fl = PV_CALLEE_SAVE(xen_save_fl),
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.irq_disable = PV_CALLEE_SAVE(xen_irq_disable),
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.irq_enable = PV_CALLEE_SAVE(xen_irq_enable),
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static const typeof(pv_ops) xen_irq_ops __initconst = {
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.irq = {
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.safe_halt = xen_safe_halt,
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.halt = xen_halt,
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.save_fl = PV_CALLEE_SAVE(xen_save_fl),
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.irq_disable = PV_CALLEE_SAVE(xen_irq_disable),
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.irq_enable = PV_CALLEE_SAVE(xen_irq_enable),
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.safe_halt = xen_safe_halt,
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.halt = xen_halt,
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},
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};
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void __init xen_init_irq_ops(void)
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{
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pv_ops.irq = xen_irq_ops;
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pv_ops.irq = xen_irq_ops.irq;
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x86_init.irqs.intr_init = xen_init_IRQ;
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}
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@ -2076,67 +2076,69 @@ static void xen_leave_lazy_mmu(void)
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preempt_enable();
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}
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static const struct pv_mmu_ops xen_mmu_ops __initconst = {
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.read_cr2 = __PV_IS_CALLEE_SAVE(xen_read_cr2),
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.write_cr2 = xen_write_cr2,
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static const typeof(pv_ops) xen_mmu_ops __initconst = {
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.mmu = {
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.read_cr2 = __PV_IS_CALLEE_SAVE(xen_read_cr2),
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.write_cr2 = xen_write_cr2,
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.read_cr3 = xen_read_cr3,
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.write_cr3 = xen_write_cr3_init,
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.read_cr3 = xen_read_cr3,
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.write_cr3 = xen_write_cr3_init,
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.flush_tlb_user = xen_flush_tlb,
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.flush_tlb_kernel = xen_flush_tlb,
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.flush_tlb_one_user = xen_flush_tlb_one_user,
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.flush_tlb_multi = xen_flush_tlb_multi,
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.tlb_remove_table = tlb_remove_table,
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.flush_tlb_user = xen_flush_tlb,
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.flush_tlb_kernel = xen_flush_tlb,
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.flush_tlb_one_user = xen_flush_tlb_one_user,
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.flush_tlb_multi = xen_flush_tlb_multi,
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.tlb_remove_table = tlb_remove_table,
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.pgd_alloc = xen_pgd_alloc,
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.pgd_free = xen_pgd_free,
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.pgd_alloc = xen_pgd_alloc,
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.pgd_free = xen_pgd_free,
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.alloc_pte = xen_alloc_pte_init,
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.release_pte = xen_release_pte_init,
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.alloc_pmd = xen_alloc_pmd_init,
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.release_pmd = xen_release_pmd_init,
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.alloc_pte = xen_alloc_pte_init,
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.release_pte = xen_release_pte_init,
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.alloc_pmd = xen_alloc_pmd_init,
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.release_pmd = xen_release_pmd_init,
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.set_pte = xen_set_pte_init,
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.set_pmd = xen_set_pmd_hyper,
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.set_pte = xen_set_pte_init,
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.set_pmd = xen_set_pmd_hyper,
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.ptep_modify_prot_start = xen_ptep_modify_prot_start,
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.ptep_modify_prot_commit = xen_ptep_modify_prot_commit,
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.ptep_modify_prot_start = xen_ptep_modify_prot_start,
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.ptep_modify_prot_commit = xen_ptep_modify_prot_commit,
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.pte_val = PV_CALLEE_SAVE(xen_pte_val),
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.pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
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.pte_val = PV_CALLEE_SAVE(xen_pte_val),
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.pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
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.make_pte = PV_CALLEE_SAVE(xen_make_pte_init),
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.make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
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.make_pte = PV_CALLEE_SAVE(xen_make_pte_init),
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.make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
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.set_pud = xen_set_pud_hyper,
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.set_pud = xen_set_pud_hyper,
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.make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
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.pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
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.make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
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.pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
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.pud_val = PV_CALLEE_SAVE(xen_pud_val),
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.make_pud = PV_CALLEE_SAVE(xen_make_pud),
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.set_p4d = xen_set_p4d_hyper,
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.pud_val = PV_CALLEE_SAVE(xen_pud_val),
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.make_pud = PV_CALLEE_SAVE(xen_make_pud),
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.set_p4d = xen_set_p4d_hyper,
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.alloc_pud = xen_alloc_pmd_init,
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.release_pud = xen_release_pmd_init,
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.alloc_pud = xen_alloc_pmd_init,
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.release_pud = xen_release_pmd_init,
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#if CONFIG_PGTABLE_LEVELS >= 5
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.p4d_val = PV_CALLEE_SAVE(xen_p4d_val),
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.make_p4d = PV_CALLEE_SAVE(xen_make_p4d),
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.p4d_val = PV_CALLEE_SAVE(xen_p4d_val),
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.make_p4d = PV_CALLEE_SAVE(xen_make_p4d),
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#endif
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.activate_mm = xen_activate_mm,
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.dup_mmap = xen_dup_mmap,
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.exit_mmap = xen_exit_mmap,
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.activate_mm = xen_activate_mm,
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.dup_mmap = xen_dup_mmap,
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.exit_mmap = xen_exit_mmap,
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.lazy_mode = {
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.enter = paravirt_enter_lazy_mmu,
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.leave = xen_leave_lazy_mmu,
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.flush = paravirt_flush_lazy_mmu,
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.lazy_mode = {
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.enter = paravirt_enter_lazy_mmu,
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.leave = xen_leave_lazy_mmu,
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.flush = paravirt_flush_lazy_mmu,
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},
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.set_fixmap = xen_set_fixmap,
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},
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.set_fixmap = xen_set_fixmap,
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};
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void __init xen_init_mmu_ops(void)
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@ -2144,7 +2146,7 @@ void __init xen_init_mmu_ops(void)
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x86_init.paging.pagetable_init = xen_pagetable_init;
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x86_init.hyper.init_after_bootmem = xen_after_bootmem;
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pv_ops.mmu = xen_mmu_ops;
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pv_ops.mmu = xen_mmu_ops.mmu;
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memset(dummy_mapping, 0xff, PAGE_SIZE);
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}
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