From 6d03a247468059b0e59c821ef39e6762d4d6fc30 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 19 Jun 2024 23:00:51 +0200 Subject: Merging upstream version 6.9.2. Signed-off-by: Daniel Baumann --- arch/x86/mm/fault.c | 49 +++++++++++++++++++++++++++++-------------------- 1 file changed, 29 insertions(+), 20 deletions(-) (limited to 'arch/x86/mm/fault.c') diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index e604d2d6cc..bba4e020dd 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -34,6 +34,8 @@ #include /* kvm_handle_async_pf */ #include /* fixup_vdso_exception() */ #include +#include +#include /* snp_dump_hva_rmpentry() */ #define CREATE_TRACE_POINTS #include @@ -250,7 +252,7 @@ static noinline int vmalloc_fault(unsigned long address) if (!pmd_k) return -1; - if (pmd_large(*pmd_k)) + if (pmd_leaf(*pmd_k)) return 0; pte_k = pte_offset_kernel(pmd_k, address); @@ -319,7 +321,7 @@ static void dump_pagetable(unsigned long address) * And let's rather not kmap-atomic the pte, just in case * it's allocated already: */ - if (!low_pfn(pmd_pfn(*pmd)) || !pmd_present(*pmd) || pmd_large(*pmd)) + if (!low_pfn(pmd_pfn(*pmd)) || !pmd_present(*pmd) || pmd_leaf(*pmd)) goto out; pte = pte_offset_kernel(pmd, address); @@ -368,7 +370,7 @@ static void dump_pagetable(unsigned long address) goto bad; pr_cont("P4D %lx ", p4d_val(*p4d)); - if (!p4d_present(*p4d) || p4d_large(*p4d)) + if (!p4d_present(*p4d) || p4d_leaf(*p4d)) goto out; pud = pud_offset(p4d, address); @@ -384,7 +386,7 @@ static void dump_pagetable(unsigned long address) goto bad; pr_cont("PMD %lx ", pmd_val(*pmd)); - if (!pmd_present(*pmd) || pmd_large(*pmd)) + if (!pmd_present(*pmd) || pmd_leaf(*pmd)) goto out; pte = pte_offset_kernel(pmd, address); @@ -547,6 +549,7 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code, unsigned long ad !(error_code & X86_PF_PROT) ? "not-present page" : (error_code & X86_PF_RSVD) ? "reserved bit violation" : (error_code & X86_PF_PK) ? "protection keys violation" : + (error_code & X86_PF_RMP) ? "RMP violation" : "permissions violation"); if (!(error_code & X86_PF_USER) && user_mode(regs)) { @@ -579,6 +582,9 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code, unsigned long ad } dump_pagetable(address); + + if (error_code & X86_PF_RMP) + snp_dump_hva_rmpentry(address); } static noinline void @@ -999,7 +1005,7 @@ spurious_kernel_fault(unsigned long error_code, unsigned long address) if (!p4d_present(*p4d)) return 0; - if (p4d_large(*p4d)) + if (p4d_leaf(*p4d)) return spurious_kernel_fault_check(error_code, (pte_t *) p4d); pud = pud_offset(p4d, address); @@ -1013,7 +1019,7 @@ spurious_kernel_fault(unsigned long error_code, unsigned long address) if (!pmd_present(*pmd)) return 0; - if (pmd_large(*pmd)) + if (pmd_leaf(*pmd)) return spurious_kernel_fault_check(error_code, (pte_t *) pmd); pte = pte_offset_kernel(pmd, address); @@ -1262,21 +1268,14 @@ void do_user_addr_fault(struct pt_regs *regs, return; } - /* - * It's safe to allow irq's after cr2 has been saved and the - * vmalloc fault has been handled. - * - * User-mode registers count as a user access even for any - * potential system fault or CPU buglet: - */ - if (user_mode(regs)) { - local_irq_enable(); - flags |= FAULT_FLAG_USER; - } else { - if (regs->flags & X86_EFLAGS_IF) - local_irq_enable(); + /* Legacy check - remove this after verifying that it doesn't trigger */ + if (WARN_ON_ONCE(!(regs->flags & X86_EFLAGS_IF))) { + bad_area_nosemaphore(regs, error_code, address); + return; } + local_irq_enable(); + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); /* @@ -1292,6 +1291,14 @@ void do_user_addr_fault(struct pt_regs *regs, if (error_code & X86_PF_INSTR) flags |= FAULT_FLAG_INSTRUCTION; + /* + * We set FAULT_FLAG_USER based on the register state, not + * based on X86_PF_USER. User space accesses that cause + * system page faults are still user accesses. + */ + if (user_mode(regs)) + flags |= FAULT_FLAG_USER; + #ifdef CONFIG_X86_64 /* * Faults in the vsyscall page might need emulation. The @@ -1478,8 +1485,10 @@ handle_page_fault(struct pt_regs *regs, unsigned long error_code, DEFINE_IDTENTRY_RAW_ERRORCODE(exc_page_fault) { - unsigned long address = read_cr2(); irqentry_state_t state; + unsigned long address; + + address = cpu_feature_enabled(X86_FEATURE_FRED) ? fred_event_data(regs) : read_cr2(); prefetchw(¤t->mm->mmap_lock); -- cgit v1.2.3