feat: arch packages with dkms kvm modules and patched qemu

packaging/vfio-native-kvm-dkms/PKGBUILD

@@ -0,0 +1,74 @@
+# Maintainer: Sandwich <sandwich@archworks.co>
+#
+# KVM modules patched for architectural conformance, built by DKMS against
+# whichever 7.2.x kernels are installed. Three VMAware checks stop firing as a
+# direct consequence, because the fix is to raise the exception the
+# architecture specifies:
+#
+#   SVM_EXCEPTIONS    a CPL>0 SVM instruction must raise #UD, not #GP
+#   KVM_INTERCEPTION  a CPL>0 VMCALL/hypercall must raise #UD, not #GP or nothing
+#   DBVM              an ICEBP #DB must report the RIP after the instruction
+#
+# The experimental CPUID-passthrough patch is built in as well but is OFF by
+# default (module parameter cpuid_passthrough). It clears the last software
+# check, TIMER, on a 1:1-pinned guest; vm-native-setup prints how to enable it.
+#
+# KVM is in-tree, so the DKMS tree carries arch/x86/kvm and virt/kvm from the
+# vanilla kernel of the same version and builds them against the installed
+# headers; the two Makefile paths that assume an in-tree build are redirected.
+# The KVM sources do not differ between the Arch flavours of one version (the
+# module srcversion is identical on linux and linux-cachyos-bore 7.2.3), so one
+# source tree serves all of them.
+#
+# THE PIN: the sources are 7.2.3's. They build against any 7.2.x headers and
+# are refused for anything else, so after a kernel upgrade past 7.2 the stock
+# modules load silently and the three checks come back. Bump _kver here.
+
+pkgname=vfio-native-kvm-dkms
+_pkgbase=vfio-native-kvm
+_kver=7.2.3
+_tag=1.1.0
+pkgver=${_kver}
+pkgrel=1
+pkgdesc="KVM modules patched to raise the exceptions the architecture specifies (DKMS, 7.2.x kernels)"
+arch=('x86_64')
+url="https://git.archworks.co/sandwich/vfio-native"
+license=('GPL-2.0-only')
+depends=('dkms')
+makedepends=('git')
+optdepends=('vfio-native: the setup and verification tooling')
+provides=("${_pkgbase}")
+conflicts=("${_pkgbase}")
+install=${pkgname}.install
+source=("git+${url}.git#tag=v${_tag}"
+        "https://cdn.kernel.org/pub/linux/kernel/v7.x/linux-${_kver}.tar.xz"
+        'dkms.conf'
+        'dkms-out-of-tree.patch'
+        'kvm-native.hook')
+noextract=("linux-${_kver}.tar.xz")
+sha256sums=('SKIP'
+            '8ba259e8e7b13ec6ef0941c8a39ad90b24bd4a4d6c0010ba6bafb794550ecd03'
+            'SKIP'
+            'SKIP'
+            'SKIP')
+
+prepare() {
+    tar -xf "linux-${_kver}.tar.xz" --wildcards \
+        "linux-${_kver}/arch/x86/kvm/*" "linux-${_kver}/virt/kvm/*"
+    cd "linux-${_kver}"
+    for p in "${srcdir}"/vfio-native/patches/kvm/000[1234]-KVM-*.patch \
+             "${srcdir}"/vfio-native/patches/kvm/EXPERIMENTAL-0006-*.patch; do
+        msg2 "applying ${p##*/}"
+        patch -Np1 -i "$p"
+    done
+    patch -Np1 -i "${srcdir}/dkms-out-of-tree.patch"
+}
+
+package() {
+    local dest="${pkgdir}/usr/src/${_pkgbase}-${pkgver}"
+    install -dm755 "${dest}/arch/x86" "${dest}/virt"
+    cp -r "linux-${_kver}/arch/x86/kvm" "${dest}/arch/x86/"
+    cp -r "linux-${_kver}/virt/kvm"     "${dest}/virt/"
+    sed "s/@PKGVER@/${pkgver}/" dkms.conf > "${dest}/dkms.conf"
+    install -Dm644 kvm-native.hook "${pkgdir}/usr/share/libalpm/hooks/90-vfio-native-kvm.hook"
+}