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| author | Sean Christopherson <seanjc@google.com> | 2026-09-23 09:37:21 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2026-09-26 00:39:55 -0400 |
| commit | 93de2a6a4b91b72607136dd656edf03fb399d27f (patch) | |
| tree | 9220c76eb23cb39a146fac9692ee69afa4aa3135 /Documentation/networking/failover.rst | |
| download | linux-stable-93de2a6a4b91b72607136dd656edf03fb399d27f.tar.gz linux-stable-93de2a6a4b91b72607136dd656edf03fb399d27f.zip | |
KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted
Manually perform cache maintenance on the source VM during intra-host
migration to ensure no stale data is left in CPU caches after the VM is
destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's
memory reclaim flows won't trigger cache maintenance, e.g. when all guest
memory is reclaimed in response to detaching from the mmu_notifier.
Note, relying on the destination VM to do cache maintenance isn't an option
as KVM doesn't require identical guest memory configurations, i.e. the
source VM may have access to memory that the destination VM does not.
Enforcing equivalent memory configurations is infeasible, as it would
require a *deep* comparison of memslots, e.g. to verify that not only are
the memslot identical, but what the memslots point at is also identical.
Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration")
Cc: stable@vger.kernel.org
Reported-by: Stefan Teodorescu <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/networking/failover.rst')
| -rw-r--r-- | Documentation/networking/failover.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/networking/failover.rst b/Documentation/networking/failover.rst new file mode 100644 index 000000000..f0c8483cd --- /dev/null +++ b/Documentation/networking/failover.rst @@ -0,0 +1,18 @@ +.. SPDX-License-Identifier: GPL-2.0 + +======== +FAILOVER +======== + +Overview +======== + +The failover module provides a generic interface for paravirtual drivers +to register a netdev and a set of ops with a failover instance. The ops +are used as event handlers that get called to handle netdev register/ +unregister/link change/name change events on slave pci ethernet devices +with the same mac address as the failover netdev. + +This enables paravirtual drivers to use a VF as an accelerated low latency +datapath. It also allows live migration of VMs with direct attached VFs by +failing over to the paravirtual datapath when the VF is unplugged. |