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hypervisor: x86: Emulator is only needed on mshv, not kvm

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On x86-64, when the underlying hypervisor platform is KVM, no
instruction emulator is necessary. KVM handles instruction boundaries
internally.

This change allows to skip the iced-x86 dependency on KVM, improving
build times, prunes the dependency graph and reduces network traffic
during the initial build.

For Hyper-V, the emulator is still necessary on x86-64, so nothing
changes there.

Signed-off-by: Christian Blichmann <cblichmann@google.com>
This commit is contained in:
Christian Blichmann 2023-06-30 11:10:05 +02:00 committed by Rob Bradford
parent 2f70800e91
commit b6d009830d
2 changed files with 3 additions and 1 deletions
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3
hypervisor/Cargo.toml
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@ -7,7 +7,7 @@ license = "Apache-2.0 OR BSD-3-Clause"
[features]
kvm = ["kvm-ioctls", "kvm-bindings", "vfio-ioctls/kvm"]
mshv = ["mshv-ioctls", "mshv-bindings", "vfio-ioctls/mshv"]
mshv = ["mshv-ioctls", "mshv-bindings", "vfio-ioctls/mshv", "iced-x86"]
tdx = []
[dependencies]
@ -27,6 +27,7 @@ vm-memory = { version = "0.11.0", features = ["backend-mmap", "backend-atomic"]
vmm-sys-util = { version = "0.11.0", features = ["with-serde"] }
[target.'cfg(target_arch = "x86_64")'.dependencies.iced-x86]
optional = true
version = "1.19.0"
default-features = false
features = ["std", "decoder", "op_code_info", "instr_info", "fast_fmt"]

1
hypervisor/src/arch/x86/mod.rs
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@ -11,6 +11,7 @@
// Copyright © 2020, Microsoft Corporation
//
#[cfg(all(feature = "mshv", target_arch = "x86_64"))]
pub mod emulator;
pub mod gdt;
#[allow(non_camel_case_types)]