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>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/phy/sunplus/Kconfig b/drivers/phy/sunplus/Kconfig
new file mode 100644
index 000000000..3bd3cfb53
--- /dev/null
+++ b/drivers/phy/sunplus/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config PHY_SUNPLUS_USB
+	tristate "Sunplus SP7021 USB 2.0 PHY driver"
+	depends on OF && (SOC_SP7021 || COMPILE_TEST)
+	select GENERIC_PHY
+	help
+	  Enable this to support the USB 2.0 PHY on Sunplus SP7021
+	  SoC. The USB 2.0 PHY controller supports battery charger
+	  and synchronous signals, various power down modes including
+	  operating, partial and suspend modes, and high-speed,
+	  full-speed and low-speed data transfer.