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Enablement PR: https://github.com/rust-lang/rust/pull/126641
While exploring enablement options, a remote test variant was chosen. This limits testing to "target" support, and skips "host tools" support.
Using Rust's normal testing infrastructure (Docker), the test suite required for a "Tier 1 with Host Tools" test is significantly over 6 hours, even on quite powerful hardware. The Dockerfile tested is located at https://github.com/ferrocene/rust/blob/539c22d365de0839bf3f0c2a27f03f30605236fc/src/ci/docker/host-x86_64/riscv64-gnu/Dockerfile
According to the Target Tier policy (https://doc.rust-lang.org/nightly/rustc/target-tier-policy.html), such long test times alone are enough to disqualify a target from reaching Tier 1.
In the interm, we are pursuing "Tier 1 (without host tools)" which would ensure the target tests (aka the functionality of artifacts produced by the x86_64 platform to be executed on the riscv64gc platform) would pass, without requiring the tools to be passing.
Alongside that work, we are pursuing successful (and fast) full host test suite runs in partnership with https://labs.scaleway.com/en/em-rv1/.
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