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f036c7fa0a
VT-d RMRR (Reserved Memory Region Reporting) regions are reserved for device use only and should not be part of allocable memory pool of OS. BIOS e820_table reports complete memory map to OS, including OS usable memory ranges and BIOS reserved memory ranges etc. x86 BIOS may not be trusted to include RMRR regions as reserved type of memory in its e820 memory map, hence validate every RMRR entry with the e820 memory map to make sure the RMRR regions will not be used by OS for any other purposes. ia64 EFI is working fine so implement RMRR validation as a dummy function Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Sohil Mehta <sohil.mehta@intel.com> Signed-off-by: Yian Chen <yian.chen@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
30 lines
700 B
C
30 lines
700 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_IOMMU_H
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#define _ASM_X86_IOMMU_H
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#include <linux/acpi.h>
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#include <asm/e820/api.h>
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extern int force_iommu, no_iommu;
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extern int iommu_detected;
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/* 10 seconds */
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#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
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static inline int __init
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arch_rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)
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{
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u64 start = rmrr->base_address;
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u64 end = rmrr->end_address + 1;
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if (e820__mapped_all(start, end, E820_TYPE_RESERVED))
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return 0;
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pr_err(FW_BUG "No firmware reserved region can cover this RMRR [%#018Lx-%#018Lx], contact BIOS vendor for fixes\n",
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start, end - 1);
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return -EINVAL;
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}
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#endif /* _ASM_X86_IOMMU_H */
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