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x86/ioremap: Map EFI runtime services data as encrypted for SEV
The dmidecode program fails to properly decode the SMBIOS data supplied by OVMF/UEFI when running in an SEV guest. The SMBIOS area, under SEV, is encrypted and resides in reserved memory that is marked as EFI runtime services data. As a result, when memremap() is attempted for the SMBIOS data, it can't be mapped as regular RAM (through try_ram_remap()) and, since the address isn't part of the iomem resources list, it isn't mapped encrypted through the fallback ioremap(). Add a new __ioremap_check_other() to deal with memory types like EFI_RUNTIME_SERVICES_DATA which are not covered by the resource ranges. This allows any runtime services data which has been created encrypted, to be mapped encrypted too. [ bp: Move functionality to a separate function. ] Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Joerg Roedel <jroedel@suse.de> Tested-by: Joerg Roedel <jroedel@suse.de> Cc: <stable@vger.kernel.org> # 5.3 Link: https://lkml.kernel.org/r/2d9e16eb5b53dc82665c95c6764b7407719df7a0.1582645327.git.thomas.lendacky@amd.com
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1 changed files with 18 additions and 0 deletions
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@ -106,6 +106,19 @@ static unsigned int __ioremap_check_encrypted(struct resource *res)
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return 0;
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}
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/*
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* The EFI runtime services data area is not covered by walk_mem_res(), but must
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* be mapped encrypted when SEV is active.
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*/
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static void __ioremap_check_other(resource_size_t addr, struct ioremap_desc *desc)
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{
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if (!sev_active())
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return;
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if (efi_mem_type(addr) == EFI_RUNTIME_SERVICES_DATA)
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desc->flags |= IORES_MAP_ENCRYPTED;
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}
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static int __ioremap_collect_map_flags(struct resource *res, void *arg)
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{
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struct ioremap_desc *desc = arg;
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@ -124,6 +137,9 @@ static int __ioremap_collect_map_flags(struct resource *res, void *arg)
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* To avoid multiple resource walks, this function walks resources marked as
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* IORESOURCE_MEM and IORESOURCE_BUSY and looking for system RAM and/or a
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* resource described not as IORES_DESC_NONE (e.g. IORES_DESC_ACPI_TABLES).
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*
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* After that, deal with misc other ranges in __ioremap_check_other() which do
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* not fall into the above category.
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*/
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static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
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struct ioremap_desc *desc)
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@ -135,6 +151,8 @@ static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
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memset(desc, 0, sizeof(struct ioremap_desc));
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walk_mem_res(start, end, desc, __ioremap_collect_map_flags);
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__ioremap_check_other(addr, desc);
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}
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/*
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