kvm: vmx: Add last_cpu to struct vcpu_vmx

As we already do in svm, record the last logical processor on which a
vCPU has run, so that it can be communicated to userspace for
potential hardware errors.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Message-Id: <20200603235623.245638-4-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 608e992e8db9d7affd0d2058dc74d33a0614490e..4d8f12c0a5c600c6a9121dbf8256ac9f3c9531bd 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6734,6 +6734,7 @@ reenter_guest:
        if (vcpu->arch.cr2 != read_cr2())
                write_cr2(vcpu->arch.cr2);
 
+       vmx->last_cpu = vcpu->cpu;
        vmx->fail = __vmx_vcpu_run(vmx, (unsigned long *)&vcpu->arch.regs,
                                   vmx->loaded_vmcs->launched);
 

diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 639798e4a6ca74a41a59824f936d59a0a6412589..f8f9e214d285f0644bc028e23eb7fac3b43b3ef2 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -300,6 +300,9 @@ struct vcpu_vmx {
        u64 ept_pointer;
 
        struct pt_desc pt_desc;
+
+       /* which host CPU was used for running this vcpu */
+       unsigned int last_cpu;
 };
 
 enum ept_pointers_status {