virtio-rtc

.github/workflows/build-aarch64.yml

@@ -8,10 +8,25 @@ jobs:
     runs-on: ubuntu-24.04-arm
     steps:
       - name: Code checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: sudo apt-get update && sudo apt-get install -y make gcc bc bison flex elfutils python3-pyelftools curl patch libelf-dev
 
+      - name: Cache kernel build
+        uses: actions/cache@v4
+        with:
+          path: |
+            linux-*/arch/arm64/boot/Image
+            linux-*/.config
+            linux-*/Module.symvers
+            linux-*/include/config
+            linux-*/include/generated
+            linux-*/arch/arm64/include/generated
+            linux-*/scripts
+            linux-*/tools
+            kernel.c
+          key: kernel-aarch64-${{ hashFiles('Makefile', 'config-common', 'config-arch-aarch64', 'config-libkrunfw_aarch64', 'patches/**') }}
+
       - name: Build aarch64 kernel
         run: make

.github/workflows/build-x86_64.yml

@@ -6,18 +6,27 @@ jobs:
     if: github.event_name == 'pull_request'
     name: Build x86_64 kernel
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust:
-          - stable
-        target:
-          - x86_64-unknown-linux-gnu
     steps:
       - name: Code checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: sudo apt-get update && sudo apt-get install -y make gcc bc bison flex elfutils python3-pyelftools curl patch libelf-dev
 
+      - name: Cache kernel build
+        uses: actions/cache@v4
+        with:
+          path: |
+            linux-*/vmlinux
+            linux-*/.config
+            linux-*/Module.symvers
+            linux-*/include/config
+            linux-*/include/generated
+            linux-*/arch/x86/include/generated
+            linux-*/scripts
+            linux-*/tools
+            kernel.c
+          key: kernel-x86_64-${{ hashFiles('Makefile', 'config-common', 'config-arch-x86_64', 'config-libkrunfw_x86_64', 'patches/**') }}
+
       - name: Build x86_64 kernel
         run: make

.github/workflows/publish-release.yml

@@ -11,21 +11,35 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Code checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
-        run: sudo apt-get update && sudo apt-get install -y make gcc bc bison flex elfutils python3-pyelftools curl patch libelf-dev gcc-aarch64-linux-gnu gcc-riscv64-linux-gnu
+        run: sudo apt-get update && sudo apt-get install -y make gcc bc bison flex elfutils python3-pyelftools curl patch libelf-dev
+
+      - name: Cache kernel build
+        uses: actions/cache@v4
+        with:
+          path: |
+            linux-*/vmlinux
+            linux-*/.config
+            linux-*/Module.symvers
+            linux-*/include/config
+            linux-*/include/generated
+            linux-*/arch/x86/include/generated
+            linux-*/scripts
+            linux-*/tools
+            kernel.c
+          key: kernel-x86_64-${{ hashFiles('Makefile', 'config-common', 'config-arch-x86_64', 'config-libkrunfw_x86_64', 'patches/**') }}
 
       - name: Build x86_64 package
         run: |
           make
           make PREFIX=tmp install
           cd tmp
-          tar czf ../libkrunfw-x86_64.tgz lib64
+          tar czf ../libkrunfw-linux-x86_64.tar.gz lib64
           cd ..
           rm -fr tmp
-          gh release upload ${{github.event.release.tag_name}} libkrunfw-x86_64.tgz
-          make clean
+          gh release upload ${{github.event.release.tag_name}} libkrunfw-linux-x86_64.tar.gz
         env:
           GITHUB_TOKEN: ${{ github.TOKEN }}
         shell: bash
@@ -35,50 +49,72 @@ jobs:
     runs-on: ubuntu-24.04-arm
     steps:
       - name: Code checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install dependencies
         run: sudo apt-get update && sudo apt-get install -y make gcc bc bison flex elfutils python3-pyelftools curl patch libelf-dev
 
+      - name: Cache kernel build
+        uses: actions/cache@v4
+        with:
+          path: |
+            linux-*/arch/arm64/boot/Image
+            linux-*/.config
+            linux-*/Module.symvers
+            linux-*/include/config
+            linux-*/include/generated
+            linux-*/arch/arm64/include/generated
+            linux-*/scripts
+            linux-*/tools
+            kernel.c
+          key: kernel-aarch64-${{ hashFiles('Makefile', 'config-common', 'config-arch-aarch64', 'config-libkrunfw_aarch64', 'patches/**') }}
+
       - name: Build aarch64 package
         run: |
           make
           make PREFIX=tmp install
           mkdir libkrunfw
           cp Makefile LICENSE-* kernel.c bin2cbundle.py libkrunfw
-          tar czf libkrunfw-prebuilt-aarch64.tgz libkrunfw
+          tar czf libkrunfw-linux-prebuilt-aarch64.tar.gz libkrunfw
           rm -fr libkrunfw
           cd tmp
-          tar czf ../libkrunfw-aarch64.tgz lib64
+          tar czf ../libkrunfw-linux-aarch64.tar.gz lib64
           cd ..
           rm -fr tmp
-          gh release upload ${{github.event.release.tag_name}} libkrunfw-prebuilt-aarch64.tgz
-          gh release upload ${{github.event.release.tag_name}} libkrunfw-aarch64.tgz
-          make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- clean
+          gh release upload ${{github.event.release.tag_name}} libkrunfw-linux-prebuilt-aarch64.tar.gz
+          gh release upload ${{github.event.release.tag_name}} libkrunfw-linux-aarch64.tar.gz
         env:
           GITHUB_TOKEN: ${{ github.TOKEN }}
         shell: bash
 
-  build-riscv64:
-    name: Build package for riscv64
-    runs-on: ubuntu-latest
+      - name: Upload kernel.c for macOS build
+        uses: actions/upload-artifact@v4
+        with:
+          name: kernel-c-aarch64
+          path: kernel.c
+
+  build-darwin-aarch64:
+    name: Build dylib for macOS aarch64
+    needs: build-aarch64
+    runs-on: macos-latest
     steps:
       - name: Code checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
-      - name: Install dependencies
-        run: sudo apt-get update && sudo apt-get install -y make gcc bc bison flex elfutils python3-pyelftools curl patch libelf-dev gcc-riscv64-linux-gnu
+      - name: Download kernel.c
+        uses: actions/download-artifact@v4
+        with:
+          name: kernel-c-aarch64
 
-      - name: Build riscv64 package
+      - name: Build macOS dylib
         run: |
-          make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu-
-          make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- PREFIX=tmp install
+          make
+          make PREFIX=tmp install
           cd tmp
-          tar czf ../libkrunfw-riscv64.tgz lib64
+          tar czf ../libkrunfw-darwin-aarch64.tar.gz lib
           cd ..
           rm -fr tmp
-          gh release upload ${{github.event.release.tag_name}} libkrunfw-riscv64.tgz
-          make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- clean
+          gh release upload ${{github.event.release.tag_name}} libkrunfw-darwin-aarch64.tar.gz
         env:
           GITHUB_TOKEN: ${{ github.TOKEN }}
         shell: bash

Makefile

@@ -1,13 +1,13 @@
-KERNEL_VERSION = linux-6.12.62
+KERNEL_VERSION = linux-6.12.68
 KERNEL_REMOTE = https://cdn.kernel.org/pub/linux/kernel/v6.x/$(KERNEL_VERSION).tar.xz
 KERNEL_TARBALL = tarballs/$(KERNEL_VERSION).tar.xz
 KERNEL_SOURCES = $(KERNEL_VERSION)
 KERNEL_PATCHES = $(shell find patches/ -name "0*.patch" | sort)
 KERNEL_C_BUNDLE = kernel.c
 
 ABI_VERSION = 5
-FULL_VERSION = 5.1.0
-TIMESTAMP = "Mon Dec 15 19:43:20 CET 2025"
+FULL_VERSION = 5.2.1
+TIMESTAMP = "Tue Feb 17 16:15:12 CET 2026"
 
 KERNEL_FLAGS = KBUILD_BUILD_TIMESTAMP=$(TIMESTAMP)
 KERNEL_FLAGS += KBUILD_BUILD_USER=root
@@ -57,7 +57,7 @@ SONAME_Linux = -Wl,-soname,$(KRUNFW_SONAME_Linux)
 KRUNFW_BINARY_Darwin = libkrunfw.$(ABI_VERSION).dylib
 KRUNFW_SONAME_Darwin = libkrunfw.$(ABI_VERSION).dylib
 KRUNFW_BASE_Darwin = libkrunfw.dylib
-SONAME_Darwin =
+SONAME_Darwin = -Wl,-current_version,$(FULL_VERSION) -Wl,-compatibility_version,$(ABI_VERSION).0.0
 
 LIBDIR_Linux = lib64
 LIBDIR_Darwin = lib
@@ -90,7 +90,16 @@ $(KERNEL_TARBALL):
 $(KERNEL_SOURCES): $(KERNEL_TARBALL)
 	tar xf $(KERNEL_TARBALL)
 	for patch in $(KERNEL_PATCHES); do patch -p1 -d $(KERNEL_SOURCES) < "$$patch"; done
-	cp config-libkrunfw$(VARIANT)_$(GUESTARCH) $(KERNEL_SOURCES)/.config
+	@if [ -f config-common ] && [ -f config-arch-$(GUESTARCH) ]; then \
+		echo "Merging config fragments: config-common + config-arch-$(GUESTARCH)"; \
+		cd $(KERNEL_SOURCES) && KCONFIG_CONFIG=.config \
+			scripts/kconfig/merge_config.sh -m \
+			../config-common \
+			../config-arch-$(GUESTARCH); \
+	else \
+		echo "Using monolithic config: config-libkrunfw$(VARIANT)_$(GUESTARCH)"; \
+		cp config-libkrunfw$(VARIANT)_$(GUESTARCH) $(KERNEL_SOURCES)/.config; \
+	fi
 	cd $(KERNEL_SOURCES) ; $(MAKE) olddefconfig
 
 $(KERNEL_BINARY_$(GUESTARCH)): $(KERNEL_SOURCES)

config-arch-aarch64

@@ -0,0 +1,58 @@
+#
+# Architecture-specific options for aarch64.
+# Merged with config-common at build time.
+#
+
+CONFIG_ARM64=y
+CONFIG_ARCH_VEXPRESS=y
+
+# ARMv8.x features
+CONFIG_ARM64_HW_AFDBM=y
+CONFIG_ARM64_PAN=y
+CONFIG_ARM64_LSE_ATOMICS=y
+CONFIG_ARM64_PMEM=y
+CONFIG_ARM64_RAS_EXTN=y
+CONFIG_ARM64_CNP=y
+CONFIG_ARM64_PTR_AUTH=y
+CONFIG_ARM64_AMU_EXTN=y
+CONFIG_ARM64_TLB_RANGE=y
+CONFIG_ARM64_BTI=y
+CONFIG_ARM64_E0PD=y
+CONFIG_ARM64_MTE=y
+CONFIG_ARM64_EPAN=y
+CONFIG_ARM64_SVE=y
+CONFIG_ARM64_SME=y
+
+# Memory layout
+CONFIG_ARM64_4K_PAGES=y
+CONFIG_ARM64_VA_BITS_48=y
+CONFIG_ARM64_PA_BITS_48=y
+CONFIG_PGTABLE_LEVELS=4
+
+# KVM (nested virtualization host support)
+CONFIG_VIRTUALIZATION=y
+CONFIG_KVM=y
+
+# Vhost (host-side virtio acceleration)
+CONFIG_VHOST=y
+CONFIG_VHOST_NET=y
+CONFIG_VHOST_VSOCK=y
+
+# GIC (interrupt controller)
+CONFIG_ARM_GIC=y
+CONFIG_ARM_GIC_V3=y
+
+# Serial
+CONFIG_SERIAL_AMBA_PL011=y
+CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
+
+# Timer
+CONFIG_ARM_ARCH_TIMER=y
+
+# Firmware
+CONFIG_ARM_PSCI_FW=y
+CONFIG_HAVE_ARM_SMCCC=y
+
+# box64 compat
+CONFIG_COMPAT=y
+CONFIG_KUSER_HELPERS=y