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, 168 insertions, 0 deletions

diff --git a/drivers/net/phy/dp83848.c b/drivers/net/phy/dp83848.c
new file mode 100644
index 000000000..d88b1999d
--- /dev/null
+++ b/drivers/net/phy/dp83848.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the Texas Instruments DP83848 PHY
+ *
+ * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <linux/module.h>
+#include <linux/phy.h>
+
+#define TI_DP83848C_PHY_ID		0x20005ca0
+#define TI_DP83620_PHY_ID		0x20005ce0
+#define NS_DP83848C_PHY_ID		0x20005c90
+#define TLK10X_PHY_ID			0x2000a210
+
+/* Registers */
+#define DP83848_MICR			0x11 /* MII Interrupt Control Register */
+#define DP83848_MISR			0x12 /* MII Interrupt Status Register */
+
+/* MICR Register Fields */
+#define DP83848_MICR_INT_OE		BIT(0) /* Interrupt Output Enable */
+#define DP83848_MICR_INTEN		BIT(1) /* Interrupt Enable */
+
+/* MISR Register Fields */
+#define DP83848_MISR_RHF_INT_EN		BIT(0) /* Receive Error Counter */
+#define DP83848_MISR_FHF_INT_EN		BIT(1) /* False Carrier Counter */
+#define DP83848_MISR_ANC_INT_EN		BIT(2) /* Auto-negotiation complete */
+#define DP83848_MISR_DUP_INT_EN		BIT(3) /* Duplex Status */
+#define DP83848_MISR_SPD_INT_EN		BIT(4) /* Speed status */
+#define DP83848_MISR_LINK_INT_EN	BIT(5) /* Link status */
+#define DP83848_MISR_ED_INT_EN		BIT(6) /* Energy detect */
+#define DP83848_MISR_LQM_INT_EN		BIT(7) /* Link Quality Monitor */
+
+#define DP83848_INT_EN_MASK		\
+	(DP83848_MISR_ANC_INT_EN |	\
+	 DP83848_MISR_DUP_INT_EN |	\
+	 DP83848_MISR_SPD_INT_EN |	\
+	 DP83848_MISR_LINK_INT_EN)
+
+#define DP83848_MISR_RHF_INT		BIT(8)
+#define DP83848_MISR_FHF_INT		BIT(9)
+#define DP83848_MISR_ANC_INT		BIT(10)
+#define DP83848_MISR_DUP_INT		BIT(11)
+#define DP83848_MISR_SPD_INT		BIT(12)
+#define DP83848_MISR_LINK_INT		BIT(13)
+#define DP83848_MISR_ED_INT		BIT(14)
+
+#define DP83848_INT_MASK		\
+	(DP83848_MISR_ANC_INT |	\
+	 DP83848_MISR_DUP_INT |	\
+	 DP83848_MISR_SPD_INT |	\
+	 DP83848_MISR_LINK_INT)
+
+static int dp83848_ack_interrupt(struct phy_device *phydev)
+{
+	int err = phy_read(phydev, DP83848_MISR);
+
+	return err < 0 ? err : 0;
+}
+
+static int dp83848_config_intr(struct phy_device *phydev)
+{
+	int control, ret;
+
+	control = phy_read(phydev, DP83848_MICR);
+	if (control < 0)
+		return control;
+
+	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
+		ret = dp83848_ack_interrupt(phydev);
+		if (ret)
+			return ret;
+
+		control |= DP83848_MICR_INT_OE;
+		control |= DP83848_MICR_INTEN;
+
+		ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
+		if (ret < 0)
+			return ret;
+
+		ret = phy_write(phydev, DP83848_MICR, control);
+	} else {
+		control &= ~DP83848_MICR_INTEN;
+		ret = phy_write(phydev, DP83848_MICR, control);
+		if (ret)
+			return ret;
+
+		ret = dp83848_ack_interrupt(phydev);
+	}
+
+	return ret;
+}
+
+static irqreturn_t dp83848_handle_interrupt(struct phy_device *phydev)
+{
+	int irq_status;
+
+	irq_status = phy_read(phydev, DP83848_MISR);
+	if (irq_status < 0) {
+		phy_error(phydev);
+		return IRQ_NONE;
+	}
+
+	if (!(irq_status & DP83848_INT_MASK))
+		return IRQ_NONE;
+
+	phy_trigger_machine(phydev);
+
+	return IRQ_HANDLED;
+}
+
+static int dp83848_config_init(struct phy_device *phydev)
+{
+	int val;
+
+	/* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,
+	 * we check initial value of BMCR Auto negotiation enable bit
+	 */
+	val = phy_read(phydev, MII_BMCR);
+	if (!(val & BMCR_ANENABLE))
+		phydev->autoneg = AUTONEG_DISABLE;
+
+	return 0;
+}
+
+static const struct mdio_device_id __maybe_unused dp83848_tbl[] = {
+	{ TI_DP83848C_PHY_ID, 0xfffffff0 },
+	{ NS_DP83848C_PHY_ID, 0xfffffff0 },
+	{ TI_DP83620_PHY_ID, 0xfffffff0 },
+	{ TLK10X_PHY_ID, 0xfffffff0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
+
+#define DP83848_PHY_DRIVER(_id, _name, _config_init)		\
+	{							\
+		.phy_id		= _id,				\
+		.phy_id_mask	= 0xfffffff0,			\
+		.name		= _name,			\
+		/* PHY_BASIC_FEATURES */			\
+								\
+		.soft_reset	= genphy_soft_reset,		\
+		.config_init	= _config_init,			\
+		.suspend	= genphy_suspend,		\
+		.resume		= genphy_resume,		\
+								\
+		/* IRQ related */				\
+		.config_intr	= dp83848_config_intr,		\
+		.handle_interrupt = dp83848_handle_interrupt,	\
+								\
+		.flags		= PHY_RST_AFTER_CLK_EN,		\
+	}
+
+static struct phy_driver dp83848_driver[] = {
+	DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",
+			   NULL),
+	DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",
+			   NULL),
+	DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",
+			   dp83848_config_init),
+	DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",
+			   NULL),
+};
+module_phy_driver(dp83848_driver);
+
+MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
+MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
+MODULE_LICENSE("GPL v2");