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 LSzhds7J HMsUwzqGZAPvWIohrpl5T7/qs+A2d2Cn5EggSeL8UyTvYQp8I0JgnJedQRsSdXxlC2yPt4yRP5BbXlKokXmn6lsrKw+a8e9T2D4+kL0Vijxav7KlyeQjKVS+8rf7TvoAehjalQSBjddzHkwoVQIty48OsQMxLqj1tVAAZFotU7ELCN6wduO9XI1WXBK2Y698yDyLZZYrFjvi8wq8bxlix5i6lbOMmVNWQ2LkUyb+VPDUzq9GxC2Y5KaO3g9KQmhfLZjvmPM7BtCBZMsEoFv4bGndze1jrLm6SkiYFP//Pw/GZzBE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/9/24 1:39 PM, Axel Rasmussen wrote: > For real MCEs, various architectures print log messages when poisoned > memory is accessed (which results in a SIGBUS). These messages can be > important for users to understand the issue. > > On the other hand, we have the userfaultfd UFFDIO_POISON operation, > which can "simulate" memory poisoning. That particular process will get > SIGBUS on access to the memory, but this effect is tied to an MM, rather > than being global like a real poison event. So, we don't want to log > about this case to the global kernel log; instead, let the process > itself log or whatever else it wants to do. This avoids spamming the > kernel log, and avoids e.g. drowning out real events with simulated > ones. > > To identify this situation, add a new VM_FAULT_HWPOISON_SIM flag. This > is expected to be set *in addition to* one of the existing > VM_FAULT_HWPOISON or VM_FAULT_HWPOISON_LARGE flags (which are mutually > exclusive). > > Signed-off-by: Axel Rasmussen > --- > arch/parisc/mm/fault.c | 7 +++++-- > arch/powerpc/mm/fault.c | 6 ++++-- > arch/x86/mm/fault.c | 6 ++++-- > include/linux/mm_types.h | 5 +++++ > mm/hugetlb.c | 3 ++- > mm/memory.c | 2 +- > 6 files changed, 21 insertions(+), 8 deletions(-) > This completely fixes the uffd-unit-test behavior, I just did a quick test run to be sure as well. Reviewed-by: John Hubbard thanks, -- John Hubbard NVIDIA > diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c > index c39de84e98b0..e5370bcadf27 100644 > --- a/arch/parisc/mm/fault.c > +++ b/arch/parisc/mm/fault.c > @@ -400,9 +400,12 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, > #ifdef CONFIG_MEMORY_FAILURE > if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) { > unsigned int lsb = 0; > - printk(KERN_ERR > + > + if (!(fault & VM_FAULT_HWPOISON_SIM)) { > + pr_err( > "MCE: Killing %s:%d due to hardware memory corruption fault at %08lx\n", > - tsk->comm, tsk->pid, address); > + tsk->comm, tsk->pid, address); > + } > /* > * Either small page or large page may be poisoned. > * In other words, VM_FAULT_HWPOISON_LARGE and > diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c > index 53335ae21a40..ac5e8a3c7fba 100644 > --- a/arch/powerpc/mm/fault.c > +++ b/arch/powerpc/mm/fault.c > @@ -140,8 +140,10 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address, > if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) { > unsigned int lsb = 0; /* shutup gcc */ > > - pr_err("MCE: Killing %s:%d due to hardware memory corruption fault at %lx\n", > - current->comm, current->pid, address); > + if (!(fault & VM_FAULT_HWPOISON_SIM)) { > + pr_err("MCE: Killing %s:%d due to hardware memory corruption fault at %lx\n", > + current->comm, current->pid, address); > + } > > if (fault & VM_FAULT_HWPOISON_LARGE) > lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault)); > diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c > index e4f3c7721f45..16d077a3ad14 100644 > --- a/arch/x86/mm/fault.c > +++ b/arch/x86/mm/fault.c > @@ -928,9 +928,11 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address, > struct task_struct *tsk = current; > unsigned lsb = 0; > > - pr_err_ratelimited( > + if (!(fault & VM_FAULT_HWPOISON_SIM)) { > + pr_err_ratelimited( > "MCE: Killing %s:%d due to hardware memory corruption fault at %lx\n", > - tsk->comm, tsk->pid, address); > + tsk->comm, tsk->pid, address); > + } > if (fault & VM_FAULT_HWPOISON_LARGE) > lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault)); > if (fault & VM_FAULT_HWPOISON) > diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h > index 5240bd7bca33..7f8fc3efc5b2 100644 > --- a/include/linux/mm_types.h > +++ b/include/linux/mm_types.h > @@ -1226,6 +1226,9 @@ typedef __bitwise unsigned int vm_fault_t; > * @VM_FAULT_HWPOISON_LARGE: Hit poisoned large page. Index encoded > * in upper bits > * @VM_FAULT_SIGSEGV: segmentation fault > + * @VM_FAULT_HWPOISON_SIM Hit poisoned, PTE marker; this indicates a > + * simulated poison (e.g. via usefaultfd's > + * UFFDIO_POISON), not a "real" hwerror. > * @VM_FAULT_NOPAGE: ->fault installed the pte, not return page > * @VM_FAULT_LOCKED: ->fault locked the returned page > * @VM_FAULT_RETRY: ->fault blocked, must retry > @@ -1245,6 +1248,7 @@ enum vm_fault_reason { > VM_FAULT_HWPOISON = (__force vm_fault_t)0x000010, > VM_FAULT_HWPOISON_LARGE = (__force vm_fault_t)0x000020, > VM_FAULT_SIGSEGV = (__force vm_fault_t)0x000040, > + VM_FAULT_HWPOISON_SIM = (__force vm_fault_t)0x000080, > VM_FAULT_NOPAGE = (__force vm_fault_t)0x000100, > VM_FAULT_LOCKED = (__force vm_fault_t)0x000200, > VM_FAULT_RETRY = (__force vm_fault_t)0x000400, > @@ -1270,6 +1274,7 @@ enum vm_fault_reason { > { VM_FAULT_HWPOISON, "HWPOISON" }, \ > { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \ > { VM_FAULT_SIGSEGV, "SIGSEGV" }, \ > + { VM_FAULT_HWPOISON_SIM, "HWPOISON_SIM" }, \ > { VM_FAULT_NOPAGE, "NOPAGE" }, \ > { VM_FAULT_LOCKED, "LOCKED" }, \ > { VM_FAULT_RETRY, "RETRY" }, \ > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 65456230cc71..2b4e0173e806 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -6485,7 +6485,8 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, > pte_marker_get(pte_to_swp_entry(entry)); > > if (marker & PTE_MARKER_POISONED) { > - ret = VM_FAULT_HWPOISON_LARGE | > + ret = VM_FAULT_HWPOISON_SIM | > + VM_FAULT_HWPOISON_LARGE | > VM_FAULT_SET_HINDEX(hstate_index(h)); > goto out_mutex; > } > diff --git a/mm/memory.c b/mm/memory.c > index d2155ced45f8..29a833b996ae 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -3910,7 +3910,7 @@ static vm_fault_t handle_pte_marker(struct vm_fault *vmf) > > /* Higher priority than uffd-wp when data corrupted */ > if (marker & PTE_MARKER_POISONED) > - return VM_FAULT_HWPOISON; > + return VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_SIM; > > if (pte_marker_entry_uffd_wp(entry)) > return pte_marker_handle_uffd_wp(vmf);