OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

KVM: nVMX: Add support for activity state HLT 

We can easily emulate the HLT activity state for L1: If it decides that
L2 shall be halted on entry, just invoke the normal emulation of halt
after switching to L2. We do not depend on specific host features to
provide this, so we can expose the capability unconditionally.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2013-12-04 08:58:54 +01:00 committed by Paolo Bonzini
parent 2961e8764f
commit 6dfacadd58
2 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/vmx.h
View File

@ -100,6 +100,7 @@
#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK 0x0000001f
#define VMX_MISC_SAVE_EFER_LMA 0x00000020
#define VMX_MISC_ACTIVITY_HLT 0x00000040
/* VMCS Encodings */
enum vmcs_field {

7
arch/x86/kvm/vmx.c
View File

@ -2340,6 +2340,7 @@ static __init void nested_vmx_setup_ctls_msrs(void)
rdmsr(MSR_IA32_VMX_MISC, nested_vmx_misc_low, nested_vmx_misc_high);
nested_vmx_misc_low &= VMX_MISC_PREEMPTION_TIMER_RATE_MASK |
VMX_MISC_SAVE_EFER_LMA;
nested_vmx_misc_low |= VMX_MISC_ACTIVITY_HLT;
nested_vmx_misc_high = 0;
}
@ -7938,7 +7939,8 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
return 1;
}
if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE) {
if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE &&
vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT) {
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
return 1;
}
@ -8067,6 +8069,9 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
prepare_vmcs02(vcpu, vmcs12);
if (vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT)
return kvm_emulate_halt(vcpu);
/*
* Note no nested_vmx_succeed or nested_vmx_fail here. At this point
* we are no longer running L1, and VMLAUNCH/VMRESUME has not yet