From 49f071ad4f197e657ea4c497a677009d1788ff63 Mon Sep 17 00:00:00 2001
From: Miriam Zimmerman <mutexlox@google.com>
Date: Mon, 11 Mar 2019 10:18:01 -0700
Subject: [PATCH] crosvm: Add KVM_SIGNAL_MSI ioctl.

This ioctl is necessary for a userspace IOAPIC.

TEST=Built
BUG=chromium:908689

Change-Id: I52fc96baef2193e4f673bbce17a1b56ded9aa6a6
Reviewed-on: https://chromium-review.googlesource.com/1515992
Commit-Ready: Miriam Zimmerman <mutexlox@chromium.org>
Tested-by: Miriam Zimmerman <mutexlox@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Zach Reizner <zachr@chromium.org>
---
 kvm/src/lib.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/kvm/src/lib.rs b/kvm/src/lib.rs
index 1cf91907ca..db3ec656c5 100644
--- a/kvm/src/lib.rs
+++ b/kvm/src/lib.rs
@@ -941,6 +941,20 @@ impl Vm {
         cap.args[0] = 24;
         self.kvm_enable_cap(&cap)
     }
+
+    /// Request that the kernel inject the specified MSI message.
+    /// Returns Ok(true) on delivery, Ok(false) if the guest blocked delivery, or an error.
+    /// See kernel documentation for KVM_SIGNAL_MSI.
+    pub fn signal_msi(&self, msi: &kvm_msi) -> Result<bool> {
+        // safe becuase we allocated the struct and we know the kernel will read
+        // exactly the size of the struct
+        let ret = unsafe { ioctl_with_ref(self, KVM_SIGNAL_MSI(), msi) };
+        if ret < 0 {
+            errno_result()
+        } else {
+            Ok(ret > 0)
+        }
+    }
 }
 
 impl AsRawFd for Vm {