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crosvm: Add ioctl wrappers for split-irqchip API.

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This includes:
  * KVM_ENABLE_CAP
    * enabling KVM_CAP_SPLIT_IRQCHIP
  * KVM_INTERRUPT

TEST=Built
BUG=chromium:908689

Change-Id: I7bae5fbc0b016a47f6e91f6501fab66373f9b106
Reviewed-on: https://chromium-review.googlesource.com/1509694
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Miriam Zimmerman <mutexlox@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
This commit is contained in:
Miriam Zimmerman 2019-03-06 12:23:58 -08:00 committed by chrome-bot
parent 7100607448
commit b0f54b9020
1 changed files with 40 additions and 0 deletions
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40
kvm/src/lib.rs
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@ -918,6 +918,29 @@ impl Vm {
}
Ok(())
}
/// Enable the specified capability.
/// See documentation for KVM_ENABLE_CAP.
pub fn kvm_enable_cap(&self, cap: &kvm_enable_cap) -> Result<()> {
// 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_ENABLE_CAP(), cap) };
if ret < 0 {
errno_result()
} else {
Ok(())
}
}
/// (x86-only): Enable support for split-irqchip.
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
pub fn enable_split_irqchip(&self) -> Result<()> {
let mut cap: kvm_enable_cap = Default::default();
cap.cap = KVM_CAP_SPLIT_IRQCHIP;
// TODO(mutexlox): When the IOAPIC is implemented, refer to its "number of pins" constant.
cap.args[0] = 24;
self.kvm_enable_cap(&cap)
}
}
impl AsRawFd for Vm {
@ -1550,6 +1573,23 @@ impl Vcpu {
}
Ok(())
}
/// Use the KVM_INTERRUPT ioctl to inject the specified interrupt vector.
///
/// While this ioctl exits on PPC and MIPS as well as x86, the semantics are different and
/// ChromeOS doesn't support PPC or MIPS.
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
pub fn interrupt(&self, irq: u32) -> Result<()> {
let interrupt = kvm_interrupt { irq };
// 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_INTERRUPT(), &interrupt) };
if ret < 0 {
errno_result()
} else {
Ok(())
}
}
}
impl AsRawFd for Vcpu {