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Diffstat (limited to 'Documentation/virt/kvm/api.rst')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 53 |
1 files changed, 47 insertions, 6 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index efbbe570aa9b..426f94582b7a 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -2572,13 +2572,15 @@ list in 4.68. :Parameters: None :Returns: 0 on success, -1 on error -This signals to the host kernel that the specified guest is being paused by -userspace. The host will set a flag in the pvclock structure that is checked -from the soft lockup watchdog. The flag is part of the pvclock structure that -is shared between guest and host, specifically the second bit of the flags +This ioctl sets a flag accessible to the guest indicating that the specified +vCPU has been paused by the host userspace. + +The host will set a flag in the pvclock structure that is checked from the +soft lockup watchdog. The flag is part of the pvclock structure that is +shared between guest and host, specifically the second bit of the flags field of the pvclock_vcpu_time_info structure. It will be set exclusively by the host and read/cleared exclusively by the guest. The guest operation of -checking and clearing the flag must an atomic operation so +checking and clearing the flag must be an atomic operation so load-link/store-conditional, or equivalent must be used. There are two cases where the guest will clear the flag: when the soft lockup watchdog timer resets itself or when a soft lockup is detected. This ioctl can be called any time @@ -4334,9 +4336,13 @@ Errors: #define KVM_STATE_NESTED_VMX_SMM_GUEST_MODE 0x00000001 #define KVM_STATE_NESTED_VMX_SMM_VMXON 0x00000002 +#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; @@ -5066,10 +5072,13 @@ EOI was received. struct kvm_hyperv_exit { #define KVM_EXIT_HYPERV_SYNIC 1 #define KVM_EXIT_HYPERV_HCALL 2 + #define KVM_EXIT_HYPERV_SYNDBG 3 __u32 type; + __u32 pad1; union { struct { __u32 msr; + __u32 pad2; __u64 control; __u64 evt_page; __u64 msg_page; @@ -5079,6 +5088,15 @@ EOI was received. __u64 result; __u64 params[2]; } hcall; + struct { + __u32 msr; + __u32 pad2; + __u64 control; + __u64 status; + __u64 send_page; + __u64 recv_page; + __u64 pending_page; + } syndbg; } u; }; /* KVM_EXIT_HYPERV */ @@ -5095,6 +5113,12 @@ Hyper-V SynIC state change. Notification is used to remap SynIC event/message pages and to enable/disable SynIC messages/events processing in userspace. + - KVM_EXIT_HYPERV_SYNDBG -- synchronously notify user-space about + +Hyper-V Synthetic debugger state change. Notification is used to either update +the pending_page location or to send a control command (send the buffer located +in send_page or recv a buffer to recv_page). + :: /* KVM_EXIT_ARM_NISV */ @@ -5777,7 +5801,7 @@ will be initialized to 1 when created. This also improves performance because dirty logging can be enabled gradually in small chunks on the first call to KVM_CLEAR_DIRTY_LOG. KVM_DIRTY_LOG_INITIALLY_SET depends on KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE (it is also only available on -x86 for now). +x86 and arm64 for now). KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 was previously available under the name KVM_CAP_MANUAL_DIRTY_LOG_PROTECT, but the implementation had bugs that make @@ -5802,6 +5826,23 @@ If present, this capability can be enabled for a VM, meaning that KVM will allow the transition to secure guest mode. Otherwise KVM will veto the transition. +7.20 KVM_CAP_HALT_POLL +---------------------- + +:Architectures: all +:Target: VM +:Parameters: args[0] is the maximum poll time in nanoseconds +:Returns: 0 on success; -1 on error + +This capability overrides the kvm module parameter halt_poll_ns for the +target VM. + +VCPU polling allows a VCPU to poll for wakeup events instead of immediately +scheduling during guest halts. The maximum time a VCPU can spend polling is +controlled by the kvm module parameter halt_poll_ns. This capability allows +the maximum halt time to specified on a per-VM basis, effectively overriding +the module parameter for the target VM. + 8. Other capabilities. ====================== |