linux-kernel - Re: [PATCH v4.1] KVM, SEV: Add KVM_EXIT

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Date:   Fri,  8 Apr 2022 12:56:42 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Gonda <pgonda@...gle.com>
Cc:     kvm@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4.1] KVM, SEV: Add KVM_EXIT_SHUTDOWN metadata for SEV-ES

Queued, thanks.  But documentation was missing:

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index e7a0dfdc0178..72183ae628f7 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6088,8 +6088,12 @@ should put the acknowledged interrupt vector into the 'epr' field.
   #define KVM_SYSTEM_EVENT_SHUTDOWN       1
   #define KVM_SYSTEM_EVENT_RESET          2
   #define KVM_SYSTEM_EVENT_CRASH          3
+  #define KVM_SYSTEM_EVENT_SEV_TERM       4
+  #define KVM_SYSTEM_EVENT_NDATA_VALID    (1u << 31)
 			__u32 type;
+                        __u32 ndata;
 			__u64 flags;
+                        __u64 data[16];
 		} system_event;

 If exit_reason is KVM_EXIT_SYSTEM_EVENT then the vcpu has triggered
@@ -6099,7 +6103,7 @@ HVC instruction based PSCI call from the vcpu. The 'type' field describes
 the system-level event type. The 'flags' field describes architecture
 specific flags for the system-level event.

-Valid values for 'type' are:
+Valid values for bits 30:0 of 'type' are:

  - KVM_SYSTEM_EVENT_SHUTDOWN -- the guest has requested a shutdown of the
    VM. Userspace is not obliged to honour this, and if it does honour
@@ -6112,12 +6116,18 @@ Valid values for 'type' are:
    has requested a crash condition maintenance. Userspace can choose
    to ignore the request, or to gather VM memory core dump and/or
    reset/shutdown of the VM.
+ - KVM_SYSTEM_EVENT_SEV_TERM -- an AMD SEV guest requested termination.
+   The guest physical address of the guest's GHCB is stored in `data[0]`.

 Valid flags are:

  - KVM_SYSTEM_EVENT_RESET_FLAG_PSCI_RESET2 (arm64 only) -- the guest issued
    a SYSTEM_RESET2 call according to v1.1 of the PSCI specification.

+Extra data for this event is stored in the `data[]` array, up to index
+`ndata-1` included, if bit 31 is set in `type`.  The data depends on the
+`type` field.  There is no extra data if bit 31 is clear or `ndata` is zero.
+
 ::

 		/* KVM_EXIT_IOAPIC_EOI */


Paolo