Table 5. Processor Settings details
Option
Description
Logical Processor
Each processor core supports up to two logical processors.
If this option is set to
Enabled
, the BIOS displays all the
logical processors. If this option is set to
Disabled
, the BIOS
displays only one logical processor per core. This option is set
to
Enabled
by default.
Virtualization Technology
Enables or disables the virtualization technology for the
processor. This option is set to
Enabled
by default.
IOMMU Support
Enable or Disable IOMMU support. It is required to create
IVRS ACPI table. This option is set to
Enabled
by default.
Kernel DMA Protection
When this option is set to Enabled, using IOMMU, BIOS,
and the Operating System will enable direct memory access
protection for DMA capable peripheral devices. Enable
IOMMU Support
to use this option. When this option is set
to Enabled, using Virtualization Technology, BIOS, and the
Operating System will enable direct memory access protection
for DMA capable peripheral devices. Enable
Virtualization
Technology
to use this option. This option is set to
Disabled
by default.
L1 Stream HW Prefetcher
Enables or disables the L1 stream hardware prefetcher. This
option is set to
Enabled
by default.
L2 Stream HW Prefetcher
Enables or disables the L2 stream hardware prefetcher. This
option is set to
Enabled
by default.
L1 Stride Prefetcher
Enables or disables the L1 stride prefetcher. This option is set
to
Enabled
by default, as it optimizes overall workload.
L1 Region Prefetcher
Enables or disables the L1 region prefetcher. This option is set
to
Enabled
by default, as it optimizes overall workload.
L2 Up Down Prefetcher
Enables or disables the L2 up down prefetcher. This option is
set to
Enabled
by default, as it optimizes overall workload.
MADT Core Enumeration
Specifies the MADT Core Enumeration. This option is set to
Linear
by default.
NUMA Nodes Per Socket
Specifies the number of NUMA nodes per socket. This option
is set to
1
by default.
L3 cache as NUMA Domain
Enables or disables the CCX as NUMA Domain. This option is
set to
Disabled
by default.
Secure Memory Encryption (SME)
Enables or disables the AMD secure encryption features such
as
SME
and
Secure Encrypted Virtualization (SEV)
. It also
determines if other secure encryption features such as
TSME
and
SEV-SNP
can be enabled. This option is set to
Disabled
by default.
Minimum SEV non-ES ASID
Determines the number of Secure Encrypted Virtualization ES
and non-ES available Address Space IDs. This option is set to
1
by default.
Secured Nested Paging (SNP)
Enables or disables
SEV-SNP
, a set of additional security
protections. This option is set to
Disabled
by default.
SNP Memory Coverage
This option selects the operating mode of the Nested Paging
(SNP) Memory and the reverse Map Table(RMP). The RMP
is used to ensure a one-to-one mapping between system
physical addresses and guest physical addresses.
Transparent Secure Memory Encryption (TSME)
Enables or disables the
TSME
.
TSME
is always-on memory
encryption that does not require OS or hypervisor support.
This option is set to
Disabled
by default.
Pre-operating system management applications
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