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Merged
fcuny merged 2 commits into from
Nov 3, 2026
Merged

kernel: trim what small, short-lived VMs don't need #83

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4ef2f7c
kernel: trim what small, short-lived VMs don't need
claude Nov 3, 2026
7bc8fd2
kernel: drop CRYPTO_KPP2, which only the self-tests selected
claude Nov 3, 2026
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10 changes: 4 additions & 6 deletions kernel/configs/7.3/aarch64.config
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Original file line number Diff line number Diff line change
Expand Up @@ -1026,16 +1026,16 @@ CONFIG_ARCH_HAS_PMD_SOFTLEAVES=y
CONFIG_CONTIG_ALLOC=y
CONFIG_PCP_BATCH_SCALE_MAX=5
CONFIG_PHYS_ADDR_T_64BIT=y
CONFIG_KSM=y
# CONFIG_KSM is not set
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_ARCH_SUPPORTS_MEMORY_FAILURE=y
# CONFIG_MEMORY_FAILURE is not set
CONFIG_ARCH_WANTS_THP_SWAP=y
# CONFIG_PERSISTENT_HUGE_ZERO_FOLIO is not set
CONFIG_MM_ID=y
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y
# CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set
# CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS is not set
CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y
# CONFIG_TRANSPARENT_HUGEPAGE_NEVER is not set
CONFIG_TRANSPARENT_HUGEPAGE_SHMEM_HUGE_NEVER=y
# CONFIG_TRANSPARENT_HUGEPAGE_SHMEM_HUGE_ALWAYS is not set
Expand Down Expand Up @@ -3224,13 +3224,11 @@ CONFIG_CRYPTO_RNG=y
CONFIG_CRYPTO_RNG2=y
CONFIG_CRYPTO_AKCIPHER2=y
CONFIG_CRYPTO_AKCIPHER=y
CONFIG_CRYPTO_KPP2=y
CONFIG_CRYPTO_ACOMP2=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_MANAGER2=y
# CONFIG_CRYPTO_USER is not set
CONFIG_CRYPTO_SELFTESTS=y
# CONFIG_CRYPTO_SELFTESTS_FULL is not set
# CONFIG_CRYPTO_SELFTESTS is not set
CONFIG_CRYPTO_NULL=y
# CONFIG_CRYPTO_PCRYPT is not set
# CONFIG_CRYPTO_CRYPTD is not set
Expand Down
11 changes: 11 additions & 0 deletions kernel/configs/c2vm.fragment
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Expand Up @@ -32,3 +32,14 @@ CONFIG_LOCALVERSION="-c2vm"

# Firecracker's config had Amazon's, which goes in the build ID.
CONFIG_BUILD_SALT=""

# The VMs are small (512 MiB by default) and short-lived: memory and boot
# time matter more than what these buy a single-tenant guest.
# Huge pages only where a program asks for them: "always" raises
# min_free_kbytes and holds memory a small VM needs.
# CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS is not set
CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y
# No page merging, and no ksmd thread: one guest has little to merge.
# CONFIG_KSM is not set
# The crypto self-tests run at each boot.
# CONFIG_CRYPTO_SELFTESTS is not set
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