s390-tools/rust: Define MSRV as 1.75.0

Define and set the minimal supported Rust version (MSRV) to 1.75.0. This
is the (current) minimal supported version over all supported distros
that use rust in s390-tools.

Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

rust/Cargo.toml

@@ -13,6 +13,7 @@ resolver = "2"
 [workspace.package]
 edition = "2021"
 license = "MIT"
+rust-version = "1.75.0"
 
 [profile.release]
 lto = true

rust/README.md

@@ -4,6 +4,8 @@
 Please refer to the official documentation to set up a working rust environment:
 https://www.rust-lang.org/learn/get-started
 
+The minimum supported Rust version (MSRV) is 1.75.
+
 ## Building rust code
 ### s390-tools build system
 If `cargo` is installed  a simple `make` should do the job. Note that,

rust/cpacfinfo/Cargo.toml

@@ -3,6 +3,7 @@ name = "cpacfinfo"
 version = "0.1.0"
 edition.workspace = true
 license.workspace = true
+rust-version.workspace = true
 
 [dependencies]
 anyhow = "1.0.71"

rust/pv/Cargo.toml

@@ -3,6 +3,7 @@ name = "s390_pv"
 version = "0.10.0"
 edition.workspace = true
 license.workspace = true
+rust-version.workspace = true
 description = "s390-tools IBM Secure Execution utilities"
 keywords = ["s390", "s390x", "IBM_Secure_Execution"]
 repository = "https://github.com/ibm-s390-linux/s390-tools/tree/master/rust"

rust/pv_core/Cargo.toml

@@ -3,6 +3,7 @@ name = "s390_pv_core"
 version = "0.10.0"
 edition.workspace = true
 license.workspace = true
+rust-version.workspace = true
 description = "s390-tools IBM Secure Execution core utilities"
 keywords = ["s390", "s390x", "IBM_Secure_Execution"]
 repository = "https://github.com/ibm-s390-linux/s390-tools/tree/master/rust"

rust/pvapconfig/Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Harald Freudenberger <freude@linux.ibm.com>"]
 version = "0.10.0"
 edition.workspace = true
 license.workspace = true
+rust-version.workspace = true
 
 [dependencies]
 clap = { version ="4.1", features = ["derive", "wrap_help"]}

rust/pvattest/Cargo.toml

@@ -3,6 +3,7 @@ name = "pvattest"
 version = "0.10.0"
 edition.workspace = true
 license.workspace = true
+rust-version.workspace = true
 
 [dependencies]
 anyhow = { version = "1.0.70", features = ["std"] }

rust/pvsecret/Cargo.toml

@@ -3,6 +3,7 @@ name = "pvsecret"
 version = "0.10.0"
 edition.workspace = true
 license.workspace = true
+rust-version.workspace = true
 
 [dependencies]
 anyhow = { version = "1.0.70", features = ["std"] }