[RFC PATCH v2 1/9] Add Rust SEV library as subproject

[Tyler Fanelli <tfanelli@redhat.com>]

The Rust sev library provides a C API for the AMD SEV launch ioctls, as
well as the ability to build with meson. Add the Rust sev library as a
QEMU subproject with the goal of outsourcing all SEV launch ioctls to C
APIs provided by it.

Signed-off-by: Tyler Fanelli <tfanelli@redhat.com>
---
 meson.build                   | 8 ++++++++
 meson_options.txt             | 2 ++
 scripts/meson-buildoptions.sh | 3 +++
 subprojects/sev.wrap          | 6 ++++++
 target/i386/meson.build       | 2 +-
 5 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 subprojects/sev.wrap

diff --git a/meson.build b/meson.build
index 20ceeb8158..8a17c29de8 100644
--- a/meson.build
+++ b/meson.build
@@ -960,6 +960,13 @@ if not get_option('slirp').auto() or have_system
   endif
 endif
 
+sev = not_found
+if not get_option('sev').auto()
+  sev = dependency('sev',
+                   method: 'pkg-config',
+                   required: get_option('sev'))
+endif
+
 vde = not_found
 if not get_option('vde').auto() or have_system or have_tools
   vde = cc.find_library('vdeplug', has_headers: ['libvdeplug.h'],
@@ -4331,6 +4338,7 @@ summary_info += {'libudev':           libudev}
 # Dummy dependency, keep .found()
 summary_info += {'FUSE lseek':        fuse_lseek.found()}
 summary_info += {'selinux':           selinux}
+summary_info += {'sev':               sev}
 summary_info += {'libdw':             libdw}
 summary(summary_info, bool_yn: true, section: 'Dependencies')
 
diff --git a/meson_options.txt b/meson_options.txt
index 57e265c871..5b8d283717 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -204,6 +204,8 @@ option('sdl_image', type : 'feature', value : 'auto',
        description: 'SDL Image support for icons')
 option('seccomp', type : 'feature', value : 'auto',
        description: 'seccomp support')
+option('sev', type : 'feature', value : 'auto',
+        description: 'Rust AMD SEV library')
 option('smartcard', type : 'feature', value : 'auto',
        description: 'CA smartcard emulation support')
 option('snappy', type : 'feature', value : 'auto',
diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
index e4b46d5715..e585a548fa 100644
--- a/scripts/meson-buildoptions.sh
+++ b/scripts/meson-buildoptions.sh
@@ -161,6 +161,7 @@ meson_options_help() {
   printf "%s\n" '  sdl-image       SDL Image support for icons'
   printf "%s\n" '  seccomp         seccomp support'
   printf "%s\n" '  selinux         SELinux support in qemu-nbd'
+  printf "%s\n" '  sev             SEV library support'
   printf "%s\n" '  slirp           libslirp user mode network backend support'
   printf "%s\n" '  slirp-smbd      use smbd (at path --smbd=*) in slirp networking'
   printf "%s\n" '  smartcard       CA smartcard emulation support'
@@ -440,6 +441,8 @@ _meson_option_parse() {
     --disable-seccomp) printf "%s" -Dseccomp=disabled ;;
     --enable-selinux) printf "%s" -Dselinux=enabled ;;
     --disable-selinux) printf "%s" -Dselinux=disabled ;;
+    --enable-sev) printf "%s" -Dsev=enabled ;;
+    --disable-sev) printf "%s" -Dsev=disabled ;;
     --enable-slirp) printf "%s" -Dslirp=enabled ;;
     --disable-slirp) printf "%s" -Dslirp=disabled ;;
     --enable-slirp-smbd) printf "%s" -Dslirp_smbd=enabled ;;
diff --git a/subprojects/sev.wrap b/subprojects/sev.wrap
new file mode 100644
index 0000000000..5be1faccf6
--- /dev/null
+++ b/subprojects/sev.wrap
@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://github.com/tylerfanelli/sev
+revision = b81b1da5df50055600a5b0349b0c4afda677cccb
+
+[provide]
+sev = sev_dep
diff --git a/target/i386/meson.build b/target/i386/meson.build
index 6f1036d469..8972a4fb17 100644
--- a/target/i386/meson.build
+++ b/target/i386/meson.build
@@ -20,7 +20,7 @@ i386_system_ss.add(files(
   'monitor.c',
   'cpu-sysemu.c',
 ))
-i386_system_ss.add(when: 'CONFIG_SEV', if_true: files('sev.c'), if_false: files('sev-sysemu-stub.c'))
+i386_system_ss.add(when: 'CONFIG_SEV', if_true: [sev, files('sev.c')], if_false: files('sev-sysemu-stub.c'))
 
 i386_user_ss = ss.source_set()
 
-- 
2.40.1