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vmm, hypervisor: Fix snapshot/restore for Windows guest

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The snasphot/restore feature is not working because some CPU states are
not properly saved, which means they can't be restored later on.

First thing, we ensure the CPUID is stored so that it can be properly
restored later. The code is simplified and pushed down to the hypervisor
crate.

Second thing, we identify for each vCPU if the Hyper-V SynIC device is
emulated or not. In case it is, that means some specific MSRs will be
set by the guest. These MSRs must be saved in order to properly restore
the VM.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2020-10-16 18:12:46 +02:00
committed by Rob Bradford
parent 700f63fad8
commit 28e12e9f3a
4 changed files with 41 additions and 16 deletions
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17
vmm/src/cpu.rs
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@@ -26,9 +26,9 @@ use anyhow::anyhow;
use arch::layout;
#[cfg(target_arch = "x86_64")]
use arch::x86_64::SgxEpcSection;
use arch::EntryPoint;
#[cfg(target_arch = "x86_64")]
use arch::{CpuidPatch, CpuidReg};
use arch::CpuidPatch;
use arch::EntryPoint;
use devices::interrupt_controller::InterruptController;
#[cfg(target_arch = "aarch64")]
use hypervisor::kvm::kvm_bindings;
@@ -688,19 +688,6 @@ impl CpuManager {
let vcpu = Vcpu::new(cpu_id, &self.vm, interrupt_controller)?;
if let Some(snapshot) = snapshot {
#[cfg(target_arch = "x86_64")]
{
let mut cpuid = self.cpuid.clone();
CpuidPatch::set_cpuid_reg(&mut cpuid, 0xb, None, CpuidReg::EDX, u32::from(cpu_id));
CpuidPatch::set_cpuid_reg(&mut cpuid, 0x1f, None, CpuidReg::EDX, u32::from(cpu_id));
vcpu.lock()
.unwrap()
.vcpu
.set_cpuid2(&cpuid)
.map_err(|e| Error::SetSupportedCpusFailed(e.into()))?;
}
// AArch64 vCPUs should be initialized after created.
#[cfg(target_arch = "aarch64")]
vcpu.lock().unwrap().init(&self.vm)?;