Merge branch 'kvm-5.20-early'

s390:

* add an interface to provide a hypervisor dump for secure guests

* improve selftests to show tests

x86:

* Intel IPI virtualization

* Allow getting/setting pending triple fault with KVM_GET/SET_VCPU_EVENTS

* PEBS virtualization

* Simplify PMU emulation by just using PERF_TYPE_RAW events

* More accurate event reinjection on SVM (avoid retrying instructions)

* Allow getting/setting the state of the speaker port data bit

* Rewrite gfn-pfn cache refresh

* Refuse starting the module if VM-Entry/VM-Exit controls are inconsistent

* "Notify" VM exit

3 files changed, 306 insertions, 3 deletions

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 11e00a46c610..9cbbfdb663b6 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -1150,6 +1150,10 @@ The following bits are defined in the flags field:
   fields contain a valid state. This bit will be set whenever
   KVM_CAP_EXCEPTION_PAYLOAD is enabled.
 
+- KVM_VCPUEVENT_VALID_TRIPLE_FAULT may be set to signal that the
+  triple_fault_pending field contains a valid state. This bit will
+  be set whenever KVM_CAP_TRIPLE_FAULT_EVENT is enabled.
+
 ARM64:
 ^^^^^^
 
@@ -1245,6 +1249,10 @@ can be set in the flags field to signal that the
 exception_has_payload, exception_payload, and exception.pending fields
 contain a valid state and shall be written into the VCPU.
 
+If KVM_CAP_TRIPLE_FAULT_EVENT is enabled, KVM_VCPUEVENT_VALID_TRIPLE_FAULT
+can be set in flags field to signal that the triple_fault field contains
+a valid state and shall be written into the VCPU.
+
 ARM64:
 ^^^^^^
 
@@ -2998,7 +3006,9 @@ KVM_CREATE_PIT2. The state is returned in the following structure::
 Valid flags are::
 
   /* disable PIT in HPET legacy mode */
-  #define KVM_PIT_FLAGS_HPET_LEGACY  0x00000001
+  #define KVM_PIT_FLAGS_HPET_LEGACY     0x00000001
+  /* speaker port data bit enabled */
+  #define KVM_PIT_FLAGS_SPEAKER_DATA_ON 0x00000002
 
 This IOCTL replaces the obsolete KVM_GET_PIT.
 
@@ -5127,7 +5137,15 @@ into ESA mode. This reset is a superset of the initial reset.
 	__u32 reserved[3];
   };
 
-cmd values:
+**Ultravisor return codes**
+The Ultravisor return (reason) codes are provided by the kernel if a
+Ultravisor call has been executed to achieve the results expected by
+the command. Therefore they are independent of the IOCTL return
+code. If KVM changes `rc`, its value will always be greater than 0
+hence setting it to 0 before issuing a PV command is advised to be
+able to detect a change of `rc`.
+
+**cmd values:**
 
 KVM_PV_ENABLE
   Allocate memory and register the VM with the Ultravisor, thereby
@@ -5143,7 +5161,6 @@ KVM_PV_ENABLE
   =====      =============================
 
 KVM_PV_DISABLE
-
   Deregister the VM from the Ultravisor and reclaim the memory that
   had been donated to the Ultravisor, making it usable by the kernel
   again.  All registered VCPUs are converted back to non-protected
@@ -5160,6 +5177,117 @@ KVM_PV_VM_VERIFY
   Verify the integrity of the unpacked image. Only if this succeeds,
   KVM is allowed to start protected VCPUs.
 
+KVM_PV_INFO
+  :Capability: KVM_CAP_S390_PROTECTED_DUMP
+
+  Presents an API that provides Ultravisor related data to userspace
+  via subcommands. len_max is the size of the user space buffer,
+  len_written is KVM's indication of how much bytes of that buffer
+  were actually written to. len_written can be used to determine the
+  valid fields if more response fields are added in the future.
+
+  ::
+
+     enum pv_cmd_info_id {
+	KVM_PV_INFO_VM,
+	KVM_PV_INFO_DUMP,
+     };
+
+     struct kvm_s390_pv_info_header {
+	__u32 id;
+	__u32 len_max;
+	__u32 len_written;
+	__u32 reserved;
+     };
+
+     struct kvm_s390_pv_info {
+	struct kvm_s390_pv_info_header header;
+	struct kvm_s390_pv_info_dump dump;
+	struct kvm_s390_pv_info_vm vm;
+     };
+
+**subcommands:**
+
+  KVM_PV_INFO_VM
+    This subcommand provides basic Ultravisor information for PV
+    hosts. These values are likely also exported as files in the sysfs
+    firmware UV query interface but they are more easily available to
+    programs in this API.
+
+    The installed calls and feature_indication members provide the
+    installed UV calls and the UV's other feature indications.
+
+    The max_* members provide information about the maximum number of PV
+    vcpus, PV guests and PV guest memory size.
+
+    ::
+
+      struct kvm_s390_pv_info_vm {
+	__u64 inst_calls_list[4];
+	__u64 max_cpus;
+	__u64 max_guests;
+	__u64 max_guest_addr;
+	__u64 feature_indication;
+      };
+
+
+  KVM_PV_INFO_DUMP
+    This subcommand provides information related to dumping PV guests.
+
+    ::
+
+      struct kvm_s390_pv_info_dump {
+	__u64 dump_cpu_buffer_len;
+	__u64 dump_config_mem_buffer_per_1m;
+	__u64 dump_config_finalize_len;
+      };
+
+KVM_PV_DUMP
+  :Capability: KVM_CAP_S390_PROTECTED_DUMP
+
+  Presents an API that provides calls which facilitate dumping a
+  protected VM.
+
+  ::
+
+    struct kvm_s390_pv_dmp {
+      __u64 subcmd;
+      __u64 buff_addr;
+      __u64 buff_len;
+      __u64 gaddr;		/* For dump storage state */
+    };
+
+  **subcommands:**
+
+  KVM_PV_DUMP_INIT
+    Initializes the dump process of a protected VM. If this call does
+    not succeed all other subcommands will fail with -EINVAL. This
+    subcommand will return -EINVAL if a dump process has not yet been
+    completed.
+
+    Not all PV vms can be dumped, the owner needs to set `dump
+    allowed` PCF bit 34 in the SE header to allow dumping.
+
+  KVM_PV_DUMP_CONFIG_STOR_STATE
+     Stores `buff_len` bytes of tweak component values starting with
+     the 1MB block specified by the absolute guest address
+     (`gaddr`). `buff_len` needs to be `conf_dump_storage_state_len`
+     aligned and at least >= the `conf_dump_storage_state_len` value
+     provided by the dump uv_info data. buff_user might be written to
+     even if an error rc is returned. For instance if we encounter a
+     fault after writing the first page of data.
+
+  KVM_PV_DUMP_COMPLETE
+    If the subcommand succeeds it completes the dump process and lets
+    KVM_PV_DUMP_INIT be called again.
+
+    On success `conf_dump_finalize_len` bytes of completion data will be
+    stored to the `buff_addr`. The completion data contains a key
+    derivation seed, IV, tweak nonce and encryption keys as well as an
+    authentication tag all of which are needed to decrypt the dump at a
+    later time.
+
+
 4.126 KVM_X86_SET_MSR_FILTER
 ----------------------------
 
@@ -5802,6 +5930,32 @@ of CPUID leaf 0xD on the host.
 
 This ioctl injects an event channel interrupt directly to the guest vCPU.
 
+4.136 KVM_S390_PV_CPU_COMMAND
+-----------------------------
+
+:Capability: KVM_CAP_S390_PROTECTED_DUMP
+:Architectures: s390
+:Type: vcpu ioctl
+:Parameters: none
+:Returns: 0 on success, < 0 on error
+
+This ioctl closely mirrors `KVM_S390_PV_COMMAND` but handles requests
+for vcpus. It re-uses the kvm_s390_pv_dmp struct and hence also shares
+the command ids.
+
+**command:**
+
+KVM_PV_DUMP
+  Presents an API that provides calls which facilitate dumping a vcpu
+  of a protected VM.
+
+**subcommand:**
+
+KVM_PV_DUMP_CPU
+  Provides encrypted dump data like register values.
+  The length of the returned data is provided by uv_info.guest_cpu_stor_len.
+
+
 5. The kvm_run structure
 ========================
 
@@ -6407,6 +6561,26 @@ spec refer, https://github.com/riscv/riscv-sbi-doc.
 
 ::
 
+    /* KVM_EXIT_NOTIFY */
+    struct {
+  #define KVM_NOTIFY_CONTEXT_INVALID	(1 << 0)
+      __u32 flags;
+    } notify;
+
+Used on x86 systems. When the VM capability KVM_CAP_X86_NOTIFY_VMEXIT is
+enabled, a VM exit generated if no event window occurs in VM non-root mode
+for a specified amount of time. Once KVM_X86_NOTIFY_VMEXIT_USER is set when
+enabling the cap, it would exit to userspace with the exit reason
+KVM_EXIT_NOTIFY for further handling. The "flags" field contains more
+detailed info.
+
+The valid value for 'flags' is:
+
+  - KVM_NOTIFY_CONTEXT_INVALID -- the VM context is corrupted and not valid
+    in VMCS. It would run into unknown result if resume the target VM.
+
+::
+
 		/* Fix the size of the union. */
 		char padding[256];
 	};
@@ -7350,6 +7524,56 @@ The valid bits in cap.args[0] are:
                                     generate a #UD within the guest.
 =================================== ============================================
 
+7.32 KVM_CAP_MAX_VCPU_ID
+------------------------
+
+:Architectures: x86
+:Target: VM
+:Parameters: args[0] - maximum APIC ID value set for current VM
+:Returns: 0 on success, -EINVAL if args[0] is beyond KVM_MAX_VCPU_IDS
+          supported in KVM or if it has been set.
+
+This capability allows userspace to specify maximum possible APIC ID
+assigned for current VM session prior to the creation of vCPUs, saving
+memory for data structures indexed by the APIC ID.  Userspace is able
+to calculate the limit to APIC ID values from designated
+CPU topology.
+
+The value can be changed only until KVM_ENABLE_CAP is set to a nonzero
+value or until a vCPU is created.  Upon creation of the first vCPU,
+if the value was set to zero or KVM_ENABLE_CAP was not invoked, KVM
+uses the return value of KVM_CHECK_EXTENSION(KVM_CAP_MAX_VCPU_ID) as
+the maximum APIC ID.
+
+7.33 KVM_CAP_X86_NOTIFY_VMEXIT
+------------------------------
+
+:Architectures: x86
+:Target: VM
+:Parameters: args[0] is the value of notify window as well as some flags
+:Returns: 0 on success, -EINVAL if args[0] contains invalid flags or notify
+          VM exit is unsupported.
+
+Bits 63:32 of args[0] are used for notify window.
+Bits 31:0 of args[0] are for some flags. Valid bits are::
+
+  #define KVM_X86_NOTIFY_VMEXIT_ENABLED    (1 << 0)
+  #define KVM_X86_NOTIFY_VMEXIT_USER       (1 << 1)
+
+This capability allows userspace to configure the notify VM exit on/off
+in per-VM scope during VM creation. Notify VM exit is disabled by default.
+When userspace sets KVM_X86_NOTIFY_VMEXIT_ENABLED bit in args[0], VMM will
+enable this feature with the notify window provided, which will generate
+a VM exit if no event window occurs in VM non-root mode for a specified of
+time (notify window).
+
+If KVM_X86_NOTIFY_VMEXIT_USER is set in args[0], upon notify VM exits happen,
+KVM would exit to userspace for handling.
+
+This capability is aimed to mitigate the threat that malicious VMs can
+cause CPU stuck (due to event windows don't open up) and make the CPU
+unavailable to host or other VMs.
+
 8. Other capabilities.
 ======================
 
@@ -7956,6 +8180,20 @@ should adjust CPUID leaf 0xA to reflect that the PMU is disabled.
 When enabled, KVM will exit to userspace with KVM_EXIT_SYSTEM_EVENT of
 type KVM_SYSTEM_EVENT_SUSPEND to process the guest suspend request.
 
+8.37 KVM_CAP_S390_PROTECTED_DUMP
+--------------------------------
+
+:Capability: KVM_CAP_S390_PROTECTED_DUMP
+:Architectures: s390
+:Type: vm
+
+This capability indicates that KVM and the Ultravisor support dumping
+PV guests. The `KVM_PV_DUMP` command is available for the
+`KVM_S390_PV_COMMAND` ioctl and the `KVM_PV_INFO` command provides
+dump related UV data. Also the vcpu ioctl `KVM_S390_PV_CPU_COMMAND` is
+available and supports the `KVM_PV_DUMP_CPU` subcommand.
+
+
 9. Known KVM API problems
 =========================
 
diff --git a/Documentation/virt/kvm/s390/index.rst b/Documentation/virt/kvm/s390/index.rst
index 605f488f0cc5..44ec9ab14b59 100644
--- a/Documentation/virt/kvm/s390/index.rst
+++ b/Documentation/virt/kvm/s390/index.rst
@@ -10,3 +10,4 @@ KVM for s390 systems
    s390-diag
    s390-pv
    s390-pv-boot
+   s390-pv-dump
diff --git a/Documentation/virt/kvm/s390/s390-pv-dump.rst b/Documentation/virt/kvm/s390/s390-pv-dump.rst
new file mode 100644
index 000000000000..e542f06048f3
--- /dev/null
+++ b/Documentation/virt/kvm/s390/s390-pv-dump.rst
@@ -0,0 +1,64 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================================
+s390 (IBM Z) Protected Virtualization dumps
+===========================================
+
+Summary
+-------
+
+Dumping a VM is an essential tool for debugging problems inside
+it. This is especially true when a protected VM runs into trouble as
+there's no way to access its memory and registers from the outside
+while it's running.
+
+However when dumping a protected VM we need to maintain its
+confidentiality until the dump is in the hands of the VM owner who
+should be the only one capable of analysing it.
+
+The confidentiality of the VM dump is ensured by the Ultravisor who
+provides an interface to KVM over which encrypted CPU and memory data
+can be requested. The encryption is based on the Customer
+Communication Key which is the key that's used to encrypt VM data in a
+way that the customer is able to decrypt.
+
+
+Dump process
+------------
+
+A dump is done in 3 steps:
+
+**Initiation**
+
+This step initializes the dump process, generates cryptographic seeds
+and extracts dump keys with which the VM dump data will be encrypted.
+
+**Data gathering**
+
+Currently there are two types of data that can be gathered from a VM:
+the memory and the vcpu state.
+
+The vcpu state contains all the important registers, general, floating
+point, vector, control and tod/timers of a vcpu. The vcpu dump can
+contain incomplete data if a vcpu is dumped while an instruction is
+emulated with help of the hypervisor. This is indicated by a flag bit
+in the dump data. For the same reason it is very important to not only
+write out the encrypted vcpu state, but also the unencrypted state
+from the hypervisor.
+
+The memory state is further divided into the encrypted memory and its
+metadata comprised of the encryption tweaks and status flags. The
+encrypted memory can simply be read once it has been exported. The
+time of the export does not matter as no re-encryption is
+needed. Memory that has been swapped out and hence was exported can be
+read from the swap and written to the dump target without need for any
+special actions.
+
+The tweaks / status flags for the exported pages need to be requested
+from the Ultravisor.
+
+**Finalization**
+
+The finalization step will provide the data needed to be able to
+decrypt the vcpu and memory data and end the dump process. When this
+step completes successfully a new dump initiation can be started.