add plugin support for model specific registers

The MSRs are useful for booting a full operating system that requires
them.

TEST=cargo test --features plugin; cargo test -p kvm; ./build_test
BUG=chromium:800626

Change-Id: I817fbf3e6868c85b373808bd48e568b5b2b458eb
Reviewed-on: https://chromium-review.googlesource.com/897412
Commit-Ready: Zach Reizner <zachr@chromium.org>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>

2 files changed, 28 insertions, 1 deletions

diff --git a/plugin_proto/Cargo.toml b/plugin_proto/Cargo.toml
index 74082b6..c9d771d 100644
--- a/plugin_proto/Cargo.toml
+++ b/plugin_proto/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "plugin_proto"
-version = "0.6.0"
+version = "0.7.0"
 authors = ["The Chromium OS Authors"]
 build = "build.rs"
 
diff --git a/plugin_proto/protos/plugin.proto b/plugin_proto/protos/plugin.proto
index e287581..7e7f137 100644
--- a/plugin_proto/protos/plugin.proto
+++ b/plugin_proto/protos/plugin.proto
@@ -206,6 +206,21 @@ message VcpuRequest {
         bytes state = 2;
     }
 
+    message GetMsrs {
+        // The entry data will be returned in the same order as this in the
+        // VcpuResponse::GetMsrs::entry_data array.
+        repeated uint32 entry_indices = 1;
+    }
+
+    message MsrEntry {
+        uint32 index = 1;
+        uint64 data = 2;
+    }
+
+    message SetMsrs {
+        repeated MsrEntry entries = 1;
+    }
+
     // The type of the message is determined by which of these oneof fields is present in the
     // protobuf.
     oneof message {
@@ -213,6 +228,8 @@ message VcpuRequest {
         Resume resume = 2;
         GetState get_state = 3;
         SetState set_state = 4;
+        GetMsrs get_msrs = 5;
+        SetMsrs set_msrs = 6;
     }
 }
 
@@ -257,6 +274,14 @@ message VcpuResponse  {
     message SetState {
     }
 
+    message GetMsrs {
+        // The order of the entry_data values is the same order as the array of indices given in the
+        // corresponding request.
+        repeated uint64 entry_data = 1;
+    }
+
+    message SetMsrs {}
+
     // This is zero on success, and a negative integer on failure.
     sint32 errno = 1;
     // The field present here is always the same as the one present in the corresponding
@@ -266,5 +291,7 @@ message VcpuResponse  {
         Resume resume = 3;
         GetState get_state = 4;
         SetState set_state = 5;
+        GetMsrs get_msrs = 6;
+        SetMsrs set_msrs = 7;
     }
 }