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hypervisor: enable x2apic API in kvm on x86_64

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Also tweak extended interrupt handlings, as needed.

Most credit should go to Neel Natu, who figured out the magic
bits needed to make things work and provided detailed comments.

This patch is still NOOP, as VM config allows only up to
254 vCPUs on x86_64.

Note: changes in this and related previous patches/PRs have
only been tested on Linux hosts running on Intel x86_64 hardware.

Signed-off-by: Barret Rhoden <brho@google.com>
Signed-off-by: Neel Natu <neelnatu@google.com>
Signed-off-by: Ofir Weisse <oweisse@google.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
This commit is contained in:
Peter Oskolkov
2025-08-25 22:28:33 +00:00
committed by Bo Chen
parent 6e002defe2
commit 6e6cf099ef
2 changed files with 89 additions and 6 deletions
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10
hypervisor/src/vm.rs
View File

@@ -126,6 +126,11 @@ pub enum HypervisorVmError {
#[error("Failed to enable split Irq")]
EnableSplitIrq(#[source] anyhow::Error),
///
/// Enable x2apic API error
///
#[error("Failed to enable x2apic API")]
EnableX2ApicApi(#[source] anyhow::Error),
///
/// Enable SGX attribute error
///
#[error("Failed to enable SGX attribute")]
@@ -440,6 +445,11 @@ pub trait Vm: Send + Sync + Any {
fn gain_page_access(&self, _gpa: u64, _size: u32) -> Result<()> {
Ok(())
}
#[cfg(all(feature = "kvm", target_arch = "x86_64"))]
fn enable_x2apic_api(&self) -> Result<()> {
unimplemented!("x2Apic is only supported on KVM/Linux hosts")
}
}
pub trait VmOps: Send + Sync {