diff --git a/scripts/launch-qemu.sh b/scripts/launch-qemu.sh
index 3267fd2..1588a6e 100755
--- a/scripts/launch-qemu.sh
+++ b/scripts/launch-qemu.sh
@@ -319,8 +319,8 @@ if [ -n "${SEV_GUEST}" ]; then
 	fi
 
 	if [ -n "$SEV_SNP_GUEST" -a -n "$SNP_UPM" ]; then
-		add_opts "-machine type=q35,confidential-guest-support=sev0,memory-backend=ram1,kvm-type=protected,vmport=off${SVSM:+,svsm=$SVSM}"
-		add_opts "-object memory-backend-memfd-private,id=ram1,size=$MEM,share=true"
+		add_opts "-machine type=q35,confidential-guest-support=sev0,memory-backend=ram1,vmport=off${SVSM:+,svsm=$SVSM}"
+		add_opts "-object memory-backend-memfd,id=ram1,size=$MEM,share=true,prealloc=false"
 	else
 		add_opts "-m ${MEM}${MAX_MEM:+,slots=5,maxmem=$MAX_MEM}"
 		add_opts "-machine type=q35,confidential-guest-support=sev0,vmport=off${SVSM:+,svsm=$SVSM}"
diff --git a/scripts/stable-commits b/scripts/stable-commits
index 9fa63ed..bc273be 100644
--- a/scripts/stable-commits
+++ b/scripts/stable-commits
@@ -6,13 +6,13 @@
 
 # Hypervisor commit
 KERNEL_GIT_URL="https://github.com/AMDESE/linux.git"
-KERNEL_HOST_BRANCH="svsm-preview-hv-v3"
-KERNEL_GUEST_BRANCH="svsm-preview-guest-v3"
+KERNEL_HOST_BRANCH="svsm-preview-hv-v4"
+KERNEL_GUEST_BRANCH="svsm-preview-guest-v4"
 
 # qemu commit
 QEMU_GIT_URL="https://github.com/AMDESE/qemu.git"
-QEMU_BRANCH="svsm-preview-v3"
+QEMU_BRANCH="svsm-preview-v4"
 
 # Guest BIOS (OVMF)
 OVMF_GIT_URL="https://github.com/AMDESE/ovmf"
-OVMF_BRANCH="svsm-preview-v3"
+OVMF_BRANCH="svsm-preview-v4"