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KVM: nVMX: fixes for preemption timer migration 

Commit 850448f35a ("KVM: nVMX: Fix VMX preemption timer migration",
2020-06-01) accidentally broke nVMX live migration from older version
by changing the userspace ABI.  Restore it and, while at it, ensure
that vmx->nested.has_preemption_timer_deadline is always initialized
according to the KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE flag.

Cc: Makarand Sonare <makarandsonare@google.com>
Fixes: 850448f35a ("KVM: nVMX: Fix VMX preemption timer migration")
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-07-09 13:12:09 -04:00
parent 8038a922cf
commit 83d31e5271
3 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Documentation/virt/kvm/api.rst
View File

@ -4339,14 +4339,15 @@ Errors:
#define KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE 0x00000001
struct kvm_vmx_nested_state_hdr {
__u32 flags;
__u64 vmxon_pa;
__u64 vmcs12_pa;
__u64 preemption_timer_deadline;
struct {
__u16 flags;
} smm;
__u32 flags;
__u64 preemption_timer_deadline;
};
struct kvm_vmx_nested_state_data {

5
arch/x86/include/uapi/asm/kvm.h
View File

@ -408,14 +408,15 @@ struct kvm_vmx_nested_state_data {
};
struct kvm_vmx_nested_state_hdr {
__u32 flags;
__u64 vmxon_pa;
__u64 vmcs12_pa;
__u64 preemption_timer_deadline;
struct {
__u16 flags;
} smm;
__u32 flags;
__u64 preemption_timer_deadline;
};
struct kvm_svm_nested_state_data {

1
arch/x86/kvm/vmx/nested.c
View File

@ -6176,6 +6176,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
goto error_guest_mode;
}
vmx->nested.has_preemption_timer_deadline = false;
if (kvm_state->hdr.vmx.flags & KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE) {
vmx->nested.has_preemption_timer_deadline = true;
vmx->nested.preemption_timer_deadline =