On 3/8/2017 12:55 AM, Dave Young wrote:
On 02/16/17 at 09:45am, Tom Lendacky wrote: [snip]+ * This function determines if an address should be mapped encrypted. + * Boot setup data, EFI data and E820 areas are checked in making this + * determination. + */ +static bool memremap_should_map_encrypted(resource_size_t phys_addr, + unsigned long size) +{ + /* + * SME is not active, return true: + * - For early_memremap_pgprot_adjust(), returning true or false + * results in the same protection value + * - For arch_memremap_do_ram_remap(), returning true will allow + * the RAM remap to occur instead of falling back to ioremap() + */ + if (!sme_active()) + return true;From the function name shouldn't above be return false?
I've re-worked this so that the check is in a different location and doesn't cause confusion.
+ + /* Check if the address is part of the setup data */ + if (memremap_is_setup_data(phys_addr, size)) + return false; + + /* Check if the address is part of EFI boot/runtime data */ + switch (efi_mem_type(phys_addr)) { + case EFI_BOOT_SERVICES_DATA: + case EFI_RUNTIME_SERVICES_DATA:Only these two types needed? I'm not sure about this, just bring up the question.
I've re-worked this code so that there is a single EFI routine that checks boot_params.efi_info.efi_memmap/efi_systab, EFI tables and the EFI memtype. As for the EFI memtypes, I believe those are the only ones required. Some of the other types will be picked up by the e820 checks (ACPI, NVS, etc.). Thanks, Tom
+ return false; + default: + break; + } + + /* Check if the address is outside kernel usable area */ + switch (e820__get_entry_type(phys_addr, phys_addr + size - 1)) { + case E820_TYPE_RESERVED: + case E820_TYPE_ACPI: + case E820_TYPE_NVS: + case E820_TYPE_UNUSABLE: + return false; + default: + break; + } + + return true; +} +Thanks Dave
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