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KVM, SEV: Add KVM_EXIT_SHUTDOWN metadata for SEV-ES

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If an SEV-ES guest requests termination, exit to userspace with
KVM_EXIT_SYSTEM_EVENT and a dedicated SEV_TERM type instead of -EINVAL
so that userspace can take appropriate action.

See AMD's GHCB spec section '4.1.13 Termination Request' for more details.

Suggested-by: Sean Christopherson <seanjc@google.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Gonda <pgonda@google.com>

Reported-by: kernel test robot <lkp@intel.com>
Message-Id: <20220407210233.782250-1-pgonda@google.com>
[Add documentatino. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Gonda 2022-04-07 14:02:33 -07:00 committed by Paolo Bonzini
parent 9bd1f0efa8
commit c24a950ec7
3 changed files with 22 additions and 4 deletions
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12
Documentation/virt/kvm/api.rst
View File

@ -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 */

9
arch/x86/kvm/svm/sev.c
View File

@ -2738,8 +2738,13 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
pr_info("SEV-ES guest requested termination: %#llx:%#llx\n",
reason_set, reason_code);
ret = -EINVAL;
break;
vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
vcpu->run->system_event.type = KVM_SYSTEM_EVENT_SEV_TERM |
KVM_SYSTEM_EVENT_NDATA_VALID;
vcpu->run->system_event.ndata = 1;
vcpu->run->system_event.data[1] = control->ghcb_gpa;
return 0;
}
default:
/* Error, keep GHCB MSR value as-is */

5
include/uapi/linux/kvm.h
View File

@ -444,8 +444,11 @@ struct kvm_run {
#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;
__u64 flags;
__u32 ndata;
__u64 data[16];
} system_event;
/* KVM_EXIT_S390_STSI */
struct {