WSL Build Scripts

.wslConfig

[wsl2]
kernel=C:\\Users\\Karthik\\WSL2\\vmlinux-5.4.91-microsoft-release
swap=0
localhostForwarding=true

build-WSL2-Linux-Kernel.sh

#!/bin/sh

set -e
[ -z $DEBUG ] || set -x

BRANCH=${BRANCH:-linux-msft-wsl-5.4.y}
PATCH=patch-${BRANCH}.diff

echo 'Cloning Tree'
[ -d WSL2-Linux-Kernel ] || git clone https://github.com/microsoft/WSL2-Linux-Kernel.git
cd WSL2-Linux-Kernel

echo 'Checking out Branch'
git stash
git reset --hard
git checkout ${BRANCH}

VERSION=$(cat Makefile | fgrep 'VERSION = ' | head -n 1 | awk '{ print $3 }')
PATCHLEVEL=$(cat Makefile | fgrep 'PATCHLEVEL = ' | head -n 1 | awk '{ print $3 }')
SUBLEVEL=$(cat Makefile | fgrep 'SUBLEVEL = ' | head -n 1 | awk '{ print $3 }')
SUFFIX=-microsoft-release

export LD=ld.bfd
export CPLUS_INCLUDE_PATH=
export C_INCLUDE_PATH=
export LIBRARY_PATH=
export KERNELRELEASE=${VERSION}.${PATCHLEVEL}.${SUBLEVEL}${SUFFIX}

echo 'Cleaning'
make LD=ld.bfd mrproper

echo 'Configuring'
cat Microsoft/config-wsl | sed 's/-microsoft-standard/-microsoft-release/g' > .config

echo 'Patching'
[ -f ../${PATCH} ] && patch -p1 < ../${PATCH}

echo 'OldConfig'
yes '' | make LD=ld.bfd KERNELRELEASE="$KERNELRELEASE" oldconfig

make LD=ld.bfd KERNELRELEASE="$KERNELRELEASE"
make LD=ld.bfd KERNELRELEASE="$KERNELRELEASE" modules

echo 'Installing /lib/modules'
sudo mkdir -p /lib/modules/$KERNELRELEASE/
sudo make LD=ld.bfd KERNELRELEASE="$KERNELRELEASE" modules install

cp vmlinux ../vmlinux-${KERNELRELEASE}

fstab

tmpfs /var/tmp tmpfs defaults 0 0
debugfs /sys/kernel/debug debugfs defaults 0 0

Optimize-WSL2.ps1

if (!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) 
{ 
    Start-Process powershell.exe "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs; exit
}
$wslPackage = "46932SUSE.openSUSELeap15.2_022rs5jcyhyac"
$image = "C:\Users\Karthik" + "\AppData\Local\Packages\" + $wslPackage + "\LocalState\ext4.vhdx"
Optimize-VHD $image
Pause

patch-linux-msft-wsl-5.4.y.diff

diff --git a/drivers/hyperv/dxgkrnl/dxgmodule.c b/drivers/hyperv/dxgkrnl/dxgmodule.c
index 4edb79d96a7a..2bd03661c7e6 100644
--- a/drivers/hyperv/dxgkrnl/dxgmodule.c
+++ b/drivers/hyperv/dxgkrnl/dxgmodule.c
@@ -417,12 +417,12 @@ const struct file_operations dxgk_fops = {
  */

 /* vGPU VM bus channel instance ID */
-const int DXGK_VMBUS_CHANNEL_ID_OFFSET = 192;
+const int DXGK_VMBUS_CHANNEL_ID_OFFSET = 192;
 /* DXGK_VMBUS_INTERFACE_VERSION (u32) */
-const int DXGK_VMBUS_VERSION_OFFSET    = DXGK_VMBUS_CHANNEL_ID_OFFSET +
+const int DXGK_VMBUS_VERSION_OFFSET    = 192 +
                                          sizeof(guid_t);
 /* Luid of the virtual GPU on the host (struct winluid) */
-const int DXGK_VMBUS_VGPU_LUID_OFFSET  = DXGK_VMBUS_VERSION_OFFSET +
+const int DXGK_VMBUS_VGPU_LUID_OFFSET  = 192 + sizeof(guid_t) +
                                          sizeof(u32);

 static int dxg_pci_read_dwords(struct pci_dev *dev, int offset, int size,
diff --git a/drivers/net/wireguard/allowedips.c b/drivers/net/wireguard/allowedips.c
index 3725e9cd85f4..9641b16d8f6f 100644
--- a/drivers/net/wireguard/allowedips.c
+++ b/drivers/net/wireguard/allowedips.c
@@ -35,14 +35,14 @@ static void push_rcu(struct allowedips_node **stack,
                     struct allowedips_node __rcu *p, unsigned int *len)
 {
        if (rcu_access_pointer(p)) {
-               WARN_ON(IS_ENABLED(DEBUG) && *len >= 128);
+               WARN_ON(IS_ENABLED(DEBUG) && *len >= 96);
                stack[(*len)++] = rcu_dereference_raw(p);
        }
 }

 static void root_free_rcu(struct rcu_head *rcu)
 {
-       struct allowedips_node *node, *stack[128] = {
+       struct allowedips_node *node, *stack[96] = {
                container_of(rcu, struct allowedips_node, rcu) };
        unsigned int len = 1;

@@ -55,7 +55,7 @@ static void root_free_rcu(struct rcu_head *rcu)

 static void root_remove_peer_lists(struct allowedips_node *root)
 {
-       struct allowedips_node *node, *stack[128] = { root };
+       struct allowedips_node *node, *stack[96] = { root };
        unsigned int len = 1;

        while (len > 0 && (node = stack[--len])) {
@@ -72,7 +72,7 @@ static void walk_remove_by_peer(struct allowedips_node __rcu **top,
 #define REF(p) rcu_access_pointer(p)
 #define DEREF(p) rcu_dereference_protected(*(p), lockdep_is_held(lock))
 #define PUSH(p) ({                                                             \
-               WARN_ON(IS_ENABLED(DEBUG) && len >= 128);                      \
+               WARN_ON(IS_ENABLED(DEBUG) && len >= 96);                      \
                stack[len++] = p;                                              \
        })

--- a/.config   2021-02-18 15:40:08.330000000 -0800
+++ b/.config   2021-02-18 16:31:05.830000000 -0800
@@ -791,6 +792,7 @@
 CONFIG_SPARSEMEM_VMEMMAP=y
 CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
 CONFIG_HAVE_FAST_GUP=y
+CONFIG_MEMORY_ISOLATION=y
 # CONFIG_MEMORY_HOTPLUG is not set
 CONFIG_SPLIT_PTLOCK_CPUS=4
 CONFIG_MEMORY_BALLOON=y
@@ -798,6 +800,7 @@
 CONFIG_COMPACTION=y
 CONFIG_PAGE_REPORTING=y
 CONFIG_MIGRATION=y
+CONFIG_CONTIG_ALLOC=y
 CONFIG_PHYS_ADDR_T_64BIT=y
 # CONFIG_BOUNCE is not set
 CONFIG_VIRT_TO_BUS=y
@@ -812,7 +815,10 @@
 CONFIG_TRANSPARENT_HUGE_PAGECACHE=y
 # CONFIG_CLEANCACHE is not set
 # CONFIG_FRONTSWAP is not set
-# CONFIG_CMA is not set
+CONFIG_CMA=y
+# CONFIG_CMA_DEBUG is not set
+# CONFIG_CMA_DEBUGFS is not set
+CONFIG_CMA_AREAS=7
 # CONFIG_MEM_SOFT_DIRTY is not set
 # CONFIG_ZPOOL is not set
 # CONFIG_ZBUD is not set
@@ -1259,7 +1265,7 @@
 CONFIG_NET_SCH_MULTIQ=y
 # CONFIG_NET_SCH_RED is not set
 # CONFIG_NET_SCH_SFB is not set
-# CONFIG_NET_SCH_SFQ is not set
+CONFIG_NET_SCH_SFQ=y
 # CONFIG_NET_SCH_TEQL is not set
 # CONFIG_NET_SCH_TBF is not set
 # CONFIG_NET_SCH_CBS is not set
@@ -1283,6 +1289,7 @@
 # CONFIG_NET_SCH_PLUG is not set
 CONFIG_NET_SCH_DEFAULT=y
 CONFIG_DEFAULT_FQ_CODEL=y
+# CONFIG_DEFAULT_SFQ is not set
 # CONFIG_DEFAULT_PFIFO_FAST is not set
 CONFIG_DEFAULT_NET_SCH="fq_codel"

@@ -1304,8 +1311,9 @@
 # CONFIG_NET_CLS_MATCHALL is not set
 # CONFIG_NET_EMATCH is not set
 CONFIG_NET_CLS_ACT=y
-# CONFIG_NET_ACT_POLICE is not set
-# CONFIG_NET_ACT_GACT is not set
+CONFIG_NET_ACT_POLICE=y
+CONFIG_NET_ACT_GACT=y
+# CONFIG_GACT_PROB is not set
 CONFIG_NET_ACT_MIRRED=y
 # CONFIG_NET_ACT_SAMPLE is not set
 CONFIG_NET_ACT_IPT=y
@@ -1512,7 +1520,7 @@
 CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
 # CONFIG_BLK_DEV_CRYPTOLOOP is not set
 # CONFIG_BLK_DEV_DRBD is not set
-# CONFIG_BLK_DEV_NBD is not set
+CONFIG_BLK_DEV_NBD=y
 # CONFIG_BLK_DEV_SKD is not set
 # CONFIG_BLK_DEV_SX8 is not set
 CONFIG_BLK_DEV_RAM=y
@@ -2799,7 +2807,7 @@
 # CONFIG_CRYPTO_PCRYPT is not set
 # CONFIG_CRYPTO_CRYPTD is not set
 CONFIG_CRYPTO_AUTHENC=y
-# CONFIG_CRYPTO_TEST is not set
+CONFIG_CRYPTO_TEST=m

 #
 # Public-key cryptography
@@ -3070,6 +3078,7 @@
 CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_ARCH_DMA_ADDR_T_64BIT=y
 CONFIG_SWIOTLB=y
+# CONFIG_DMA_CMA is not set
 # CONFIG_DMA_API_DEBUG is not set
 CONFIG_SGL_ALLOC=y
 CONFIG_CPU_RMAP=y
@@ -3317,4 +3326,3 @@
 # CONFIG_UNWINDER_FRAME_POINTER is not set
 # CONFIG_UNWINDER_GUESS is not set
 # end of Kernel hacking
-