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, 56 insertions, 0 deletions

diff --git a/drivers/pinctrl/airoha/Kconfig b/drivers/pinctrl/airoha/Kconfig
new file mode 100644
index 000000000..22b8f850c
--- /dev/null
+++ b/drivers/pinctrl/airoha/Kconfig
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "Airoha pinctrl drivers"
+	depends on ARCH_AIROHA || COMPILE_TEST
+
+config PINCTRL_AIROHA
+	tristate "Airoha pin control"
+	depends on OF
+	depends on ARCH_AIROHA || COMPILE_TEST
+	select PINMUX
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	select REGMAP_MMIO
+	imply PINCTRL_AIROHA_AN7563
+	imply PINCTRL_AIROHA_AN7581
+	imply PINCTRL_AIROHA_AN7583
+	imply PINCTRL_AIROHA_EN7523
+	help
+	  Shared pin controller and gpio driver code for different
+	  Airoha SoCs.
+
+config PINCTRL_AIROHA_AN7563
+	tristate "AN7563 pinctrl"
+	depends on ARM64 || COMPILE_TEST
+	depends on PINCTRL_AIROHA
+	help
+	  Say yes here to support pin controller and gpio driver
+	  on Airoha AN7563 and other compatible SoCs.
+
+config PINCTRL_AIROHA_AN7581
+	tristate "AN7581 pinctrl"
+	depends on ARM64 || COMPILE_TEST
+	depends on PINCTRL_AIROHA
+	help
+	  Say yes here to support pin controller and gpio driver
+	  on Airoha AN7581, AN7566, AN7551 and other compatible SoCs.
+
+config PINCTRL_AIROHA_AN7583
+	tristate "AN7583 pinctrl"
+	depends on ARM64 || COMPILE_TEST
+	depends on PINCTRL_AIROHA
+	help
+	  Say yes here to support pin controller and gpio driver
+	  on Airoha AN7583, AN7553, AN7567 and other compatible SoCs.
+
+config PINCTRL_AIROHA_EN7523
+	tristate "EN7523 pinctrl"
+	depends on ARM || COMPILE_TEST
+	depends on PINCTRL_AIROHA
+	help
+	  Say yes here to support pin controller and gpio driver
+	  on Airoha EN7523, EN7529, EN7562 and other compatible SoCs.
+
+endmenu