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, 79 insertions, 0 deletions

diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig
new file mode 100644
index 000000000..7557b624b
--- /dev/null
+++ b/drivers/phy/freescale/Kconfig
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+if (ARCH_MXC && ARM64) || COMPILE_TEST
+
+config PHY_FSL_IMX8MQ_USB
+	tristate "Freescale i.MX8M USB3 PHY"
+	depends on OF && HAS_IOMEM
+	depends on TYPEC || TYPEC=n
+	select GENERIC_PHY
+	select REGMAP_MMIO
+	default ARCH_MXC && ARM64
+
+config PHY_MIXEL_LVDS_PHY
+	tristate "Mixel LVDS PHY support"
+	depends on OF
+	select GENERIC_PHY
+	select REGMAP_MMIO
+	help
+	  Enable this to add support for the Mixel LVDS PHY as found
+	  on NXP's i.MX8qm SoC.
+
+config PHY_MIXEL_MIPI_DPHY
+	tristate "Mixel MIPI DSI PHY support"
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+	select GENERIC_PHY_MIPI_DPHY
+	select REGMAP_MMIO
+	help
+	  Enable this to add support for the Mixel DSI PHY as found
+	  on NXP's i.MX8 family of SOCs.
+
+config PHY_FSL_IMX8M_PCIE
+	tristate "Freescale i.MX8M PCIE PHY"
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to add support for the PCIE PHY as found on
+	  i.MX8M family of SOCs.
+
+config PHY_FSL_IMX8QM_HSIO
+	tristate "Freescale i.MX8QM HSIO PHY"
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to add support for the HSIO PHY as found on
+	  i.MX8QM family of SOCs.
+
+config PHY_FSL_SAMSUNG_HDMI_PHY
+	tristate "Samsung HDMI PHY support"
+	depends on OF && HAS_IOMEM && COMMON_CLK
+	help
+	  Enable this to add support for the Samsung HDMI PHY in i.MX8MP.
+endif
+
+config PHY_FSL_LYNX_CORE
+	tristate
+
+config PHY_FSL_LYNX_10G
+	tristate "Freescale Layerscape Lynx 10G SerDes PHY support"
+	depends on OF
+	depends on ARCH_LAYERSCAPE || COMPILE_TEST
+	select FSL_GUTS
+	select GENERIC_PHY
+	select PHY_FSL_LYNX_CORE
+	help
+	  Enable this to add support for the Lynx 10G SerDes PHY as found on
+	  NXP's Layerscape platform such as LS1088A or LS1028A.
+
+config PHY_FSL_LYNX_28G
+	tristate "Freescale Layerscape Lynx 28G SerDes PHY support"
+	depends on OF
+	depends on ARCH_LAYERSCAPE || COMPILE_TEST
+	select GENERIC_PHY
+	select PHY_FSL_LYNX_CORE
+	help
+	  Enable this to add support for the Lynx SerDes 28G PHY as
+	  found on NXP's Layerscape platforms such as LX2160A.
+	  Used to change the protocol running on SerDes lanes at runtime.
+	  Only useful for a restricted set of Ethernet protocols.