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Commit 934002cd authored by Alper Gun's avatar Alper Gun Committed by Paolo Bonzini
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KVM: SVM: Call SEV Guest Decommission if ASID binding fails



Send SEV_CMD_DECOMMISSION command to PSP firmware if ASID binding
fails. If a failure happens after  a successful LAUNCH_START command,
a decommission command should be executed. Otherwise, guest context
will be unfreed inside the AMD SP. After the firmware will not have
memory to allocate more SEV guest context, LAUNCH_START command will
begin to fail with SEV_RET_RESOURCE_LIMIT error.

The existing code calls decommission inside sev_unbind_asid, but it is
not called if a failure happens before guest activation succeeds. If
sev_bind_asid fails, decommission is never called. PSP firmware has a
limit for the number of guests. If sev_asid_binding fails many times,
PSP firmware will not have resources to create another guest context.

Cc: stable@vger.kernel.org
Fixes: 59414c98 ("KVM: SVM: Add support for KVM_SEV_LAUNCH_START command")
Reported-by: default avatarPeter Gonda <pgonda@google.com>
Signed-off-by: default avatarAlper Gun <alpergun@google.com>
Reviewed-by: default avatarMarc Orr <marcorr@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210610174604.2554090-1-alpergun@google.com>
parent 78fcb2c9
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