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charset="utf-8" From: Koba Ko PRMT needs to find the correct type of block to translate the PA-VA mapping for EFI runtime services. The issue arises because the PRMT is finding a block of type EFI_CONVENTIONAL_MEMORY, which is not appropriate for runtime services as described in Section 2.2.2 (Runtime Services) of the UEFI Specification [1]. Since the PRM handler is a type of runtime service, this causes an exception when the PRM handler is called. [Firmware Bug]: Unable to handle paging request in EFI runtime service WARNING: CPU: 22 PID: 4330 at drivers/firmware/efi/runtime-wrappers.c:3= 41 __efi_queue_work+0x11c/0x170 Call trace: Find a block with specific type to fix this. PRMT find a block with EFI_MEMORY_RUNTIME for PRM handler and PRM context. If no suitable block is found, a warning message will be prompted but the procedure continues to manage the next PRM handler. However, if the PRM handler is actually called without proper allocation, it would result in a failure during error handling. By using the correct memory types for runtime services, ensure that the PRM handler and the context are properly mapped in the virtual address space during runtime, preventing the paging request error. The issue is really that only memory that has been remapped for runtime by the firmware can be used by the PRM handler, and so the region needs to have the EFI_MEMORY_RUNTIME attribute. [1] https://uefi.org/sites/default/files/resources/UEFI_Spec_2_10_Aug29.pdf Fixes: cefc7ca46235 ("ACPI: PRM: implement OperationRegion handler for the = PlatformRtMechanism subtype") cc: stable@vger.kernel.org Signed-off-by: Koba Ko Reviewed-by: Matthew R. Ochs Reviewed-by: Zhang Rui Reviewed-by: Ard Biesheuvel --- V2: 1. format the changelog and add more about error handling. 2. replace goto V3: Warn if parts of handler are missed during va-pa translating. V4: Fix the 0day V5: Fix typo and pr_warn warning V6: use EFI_MOMOERY_RUNTIME to find block and split goto refactor as a sing= le patch V7: 1. refine the codes and commit description as per comments 2. drop goto refacotr V8: Fix 0day and cc to stable V9: Describe 0day fix =20 cast PA as (void *) in pr_warn=20 --- drivers/acpi/prmt.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c index 1cfaa5957ac4..552442bc10fd 100644 --- a/drivers/acpi/prmt.c +++ b/drivers/acpi/prmt.c @@ -72,17 +72,21 @@ struct prm_module_info { struct prm_handler_info handlers[] __counted_by(handler_count); }; =20 -static u64 efi_pa_va_lookup(u64 pa) +static u64 efi_pa_va_lookup(efi_guid_t *guid, u64 pa) { efi_memory_desc_t *md; u64 pa_offset =3D pa & ~PAGE_MASK; u64 page =3D pa & PAGE_MASK; =20 for_each_efi_memory_desc(md) { - if (md->phys_addr < pa && pa < md->phys_addr + PAGE_SIZE * md->num_pages) + if ((md->attribute & EFI_MEMORY_RUNTIME) && + (md->phys_addr < pa && pa < md->phys_addr + PAGE_SIZE * md->num_page= s)) { return pa_offset + md->virt_addr + page - md->phys_addr; + } } =20 + pr_warn("Failed to find VA for GUID: %pUL, PA: %p", guid, (void *)pa); + return 0; } =20 @@ -148,9 +152,15 @@ acpi_parse_prmt(union acpi_subtable_headers *header, c= onst unsigned long end) th =3D &tm->handlers[cur_handler]; =20 guid_copy(&th->guid, (guid_t *)handler_info->handler_guid); - th->handler_addr =3D (void *)efi_pa_va_lookup(handler_info->handler_addr= ess); - th->static_data_buffer_addr =3D efi_pa_va_lookup(handler_info->static_da= ta_buffer_address); - th->acpi_param_buffer_addr =3D efi_pa_va_lookup(handler_info->acpi_param= _buffer_address); + th->handler_addr =3D + (void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address); + + th->static_data_buffer_addr =3D + efi_pa_va_lookup(&th->guid, handler_info->static_data_buffer_address); + + th->acpi_param_buffer_addr =3D + efi_pa_va_lookup(&th->guid, handler_info->acpi_param_buffer_address); + } while (++cur_handler < tm->handler_count && (handler_info =3D get_next_= handler(handler_info))); =20 return 0; @@ -277,6 +287,13 @@ static acpi_status acpi_platformrt_space_handler(u32 f= unction, if (!handler || !module) goto invalid_guid; =20 + if (!handler->handler_addr || + !handler->static_data_buffer_addr || + !handler->acpi_param_buffer_addr) { + buffer->prm_status =3D PRM_HANDLER_ERROR; + return AE_OK; + } + ACPI_COPY_NAMESEG(context.signature, "PRMC"); context.revision =3D 0x0; context.reserved =3D 0x0; --=20 2.43.0