Remove manual kernel module loading

Remove unnecessary manual loading of KVM and OpenvSwitch kernel
modules during host setup. These modules are automatically loaded
by their respective systemd services (libvirt and openvswitch)
when they start.

Changes:
- Remove load_kvm_module() and load_ovs_module() functions from
  common.sh
- Remove module loading calls from setup-host.sh
- Update QUICKSTART.md to reflect that services are enabled and
  started (modules are loaded automatically)
- Remove modprobe reference from require_root error message

This simplifies the setup process and relies on proper systemd
service dependencies rather than manually managing kernel modules.

Assisted-By: Claude Code - claude-4.5-sonnet
Signed-off-by: Harald Jensås <hjensas@redhat.com>

Author: hjensas

devsetup/hotstack-os/QUICKSTART.md

@@ -21,8 +21,7 @@ sudo make setup
 
 This performs complete host setup:
 - Installs required packages (`openvswitch`, `libvirt`, `nfs-utils`, etc.)
-- Starts required services (`openvswitch`, `libvirt`, `nfs-server`)
-- Loads kernel modules (`kvm_intel`/`kvm_amd`, `openvswitch`)
+- Enables and starts required services (`openvswitch`, `libvirt`, `nfs-server`)
 - Verifies KVM support (`/dev/kvm` exists)
 - Creates system directories for Nova instances with proper ownership
 - Sets up NFS server for Cinder volumes (exported to localhost)

devsetup/hotstack-os/scripts/common.sh

@@ -319,66 +319,6 @@ wait_for_container() {
     return 1
 }
 
-# ============================================================================
-# Kernel Module Functions
-# ============================================================================
-
-# Load KVM kernel module (Intel or AMD)
-# Usage: load_kvm_module
-# Returns: 0 on success, 1 on failure
-load_kvm_module() {
-    if lsmod | grep -q "^kvm_intel"; then
-        echo -e "${GREEN}✓${NC} Kernel module kvm_intel is already loaded"
-        return 0
-    elif lsmod | grep -q "^kvm_amd"; then
-        echo -e "${GREEN}✓${NC} Kernel module kvm_amd is already loaded"
-        return 0
-    else
-        # Try to detect CPU vendor and load appropriate module
-        if grep -q "vendor_id.*GenuineIntel" /proc/cpuinfo; then
-            echo -e "${YELLOW}⚠${NC} Loading kvm_intel module..."
-            if modprobe kvm_intel; then
-                lsmod | grep -q "^kvm_intel" && echo -e "${GREEN}✓${NC} kvm_intel module loaded"
-                return 0
-            else
-                echo -e "${RED}✗${NC} Failed to load kvm_intel module"
-                return 1
-            fi
-        elif grep -q "vendor_id.*AuthenticAMD" /proc/cpuinfo; then
-            echo -e "${YELLOW}⚠${NC} Loading kvm_amd module..."
-            if modprobe kvm_amd; then
-                lsmod | grep -q "^kvm_amd" && echo -e "${GREEN}✓${NC} kvm_amd module loaded"
-                return 0
-            else
-                echo -e "${RED}✗${NC} Failed to load kvm_amd module"
-                return 1
-            fi
-        else
-            echo -e "${RED}✗${NC} Cannot detect CPU vendor for KVM module"
-            return 1
-        fi
-    fi
-}
-
-# Load OpenvSwitch kernel module
-# Usage: load_ovs_module
-# Returns: 0 on success, 1 on failure
-load_ovs_module() {
-    if lsmod | grep -q "^openvswitch"; then
-        echo -e "${GREEN}✓${NC} Kernel module openvswitch is already loaded"
-        return 0
-    else
-        echo -e "${YELLOW}⚠${NC} Loading openvswitch module..."
-        if modprobe openvswitch; then
-            lsmod | grep -q "^openvswitch" && echo -e "${GREEN}✓${NC} openvswitch module loaded"
-            return 0
-        else
-            echo -e "${RED}✗${NC} Failed to load openvswitch module"
-            return 1
-        fi
-    fi
-}
-
 # ============================================================================
 # System Services Functions
 # ============================================================================
@@ -397,21 +337,6 @@ verify_libvirt() {
     fi
 }
 
-# Verify KVM support
-# Usage: verify_kvm
-# Returns: 0 if available, 1 otherwise
-verify_kvm() {
-    echo "Checking KVM support..."
-    if [ -e /dev/kvm ]; then
-        echo -e "${GREEN}✓${NC} /dev/kvm exists"
-        return 0
-    else
-        echo -e "${RED}✗${NC} /dev/kvm does not exist - KVM not available"
-        echo "  Enable virtualization in BIOS/UEFI"
-        return 1
-    fi
-}
-
 # Setup OpenvSwitch service
 # Usage: setup_openvswitch_service
 setup_openvswitch_service() {
@@ -617,7 +542,6 @@ require_root() {
         echo "This script requires root privileges to:"
         echo "  - Install system packages (dnf install)"
         echo "  - Start/enable system services (systemctl)"
-        echo "  - Load kernel modules (modprobe)"
         echo "  - Configure firewall (firewall-cmd)"
         echo "  - Create system directories (/var/lib/nova/instances)"
         echo "  - Setup NFS server for Cinder (exportfs, nfs-server)"

devsetup/hotstack-os/scripts/setup-host.sh

@@ -57,11 +57,6 @@ fi
 
 install_queued_packages
 
-# Load kernel modules
-echo "Loading kernel modules..."
-load_kvm_module || exit 1
-load_ovs_module || exit 1
-
 # Check for network subnet conflicts
 echo -n "Checking network availability... "
 SUBNET_IN_USE=0