From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration 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 Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- drivers/mfd/tps65086.c | 148 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) create mode 100644 drivers/mfd/tps65086.c (limited to 'drivers/mfd/tps65086.c') diff --git a/drivers/mfd/tps65086.c b/drivers/mfd/tps65086.c new file mode 100644 index 000000000..54832e932 --- /dev/null +++ b/drivers/mfd/tps65086.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/ + * Andrew F. Davis + * + * Based on the TPS65912 driver + */ + +#include +#include +#include +#include + +#include + +static const struct mfd_cell tps65086_cells[] = { + { .name = "tps65086-regulator", }, + { .name = "tps65086-gpio", }, + { .name = "tps65086-reset", }, +}; + +static const struct regmap_range tps65086_yes_ranges[] = { + regmap_reg_range(TPS65086_IRQ, TPS65086_IRQ), + regmap_reg_range(TPS65086_PMICSTAT, TPS65086_SHUTDNSRC), + regmap_reg_range(TPS65086_GPOCTRL, TPS65086_GPOCTRL), + regmap_reg_range(TPS65086_PG_STATUS1, TPS65086_OC_STATUS), +}; + +static const struct regmap_access_table tps65086_volatile_table = { + .yes_ranges = tps65086_yes_ranges, + .n_yes_ranges = ARRAY_SIZE(tps65086_yes_ranges), +}; + +static const struct regmap_config tps65086_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .cache_type = REGCACHE_MAPLE, + .volatile_table = &tps65086_volatile_table, + .max_register = TPS65086_OC_STATUS, +}; + +static const struct regmap_irq tps65086_irqs[] = { + REGMAP_IRQ_REG(TPS65086_IRQ_DIETEMP, 0, TPS65086_IRQ_DIETEMP_MASK), + REGMAP_IRQ_REG(TPS65086_IRQ_SHUTDN, 0, TPS65086_IRQ_SHUTDN_MASK), + REGMAP_IRQ_REG(TPS65086_IRQ_FAULT, 0, TPS65086_IRQ_FAULT_MASK), +}; + +static const struct regmap_irq_chip tps65086_irq_chip = { + .name = "tps65086", + .status_base = TPS65086_IRQ, + .mask_base = TPS65086_IRQ_MASK, + .ack_base = TPS65086_IRQ, + .init_ack_masked = true, + .num_regs = 1, + .irqs = tps65086_irqs, + .num_irqs = ARRAY_SIZE(tps65086_irqs), +}; + +static const struct of_device_id tps65086_of_match_table[] = { + { .compatible = "ti,tps65086", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, tps65086_of_match_table); + +static int tps65086_probe(struct i2c_client *client) +{ + struct tps65086 *tps; + unsigned int version; + int ret; + + tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); + if (!tps) + return -ENOMEM; + + i2c_set_clientdata(client, tps); + tps->dev = &client->dev; + tps->irq = client->irq; + + tps->regmap = devm_regmap_init_i2c(client, &tps65086_regmap_config); + if (IS_ERR(tps->regmap)) { + dev_err(tps->dev, "Failed to initialize register map\n"); + return PTR_ERR(tps->regmap); + } + + /* Store device ID to load regulator configuration that fit to IC variant */ + ret = regmap_read(tps->regmap, TPS65086_DEVICEID1, &tps->chip_id); + if (ret) { + dev_err(tps->dev, "Failed to read revision register 1\n"); + return ret; + } + + ret = regmap_read(tps->regmap, TPS65086_DEVICEID2, &version); + if (ret) { + dev_err(tps->dev, "Failed to read revision register 2\n"); + return ret; + } + + dev_info(tps->dev, "Device: TPS65086%01lX, OTP: %c, Rev: %ld\n", + (version & TPS65086_DEVICEID2_PART_MASK), + (char)((version & TPS65086_DEVICEID2_OTP_MASK) >> 4) + 'A', + (version & TPS65086_DEVICEID2_REV_MASK) >> 6); + + if (tps->irq > 0) { + ret = regmap_add_irq_chip(tps->regmap, tps->irq, IRQF_ONESHOT, 0, + &tps65086_irq_chip, &tps->irq_data); + if (ret) { + dev_err(tps->dev, "Failed to register IRQ chip\n"); + return ret; + } + } + + ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65086_cells, + ARRAY_SIZE(tps65086_cells), NULL, 0, + regmap_irq_get_domain(tps->irq_data)); + if (ret && tps->irq > 0) + regmap_del_irq_chip(tps->irq, tps->irq_data); + + return ret; +} + +static void tps65086_remove(struct i2c_client *client) +{ + struct tps65086 *tps = i2c_get_clientdata(client); + + if (tps->irq > 0) + regmap_del_irq_chip(tps->irq, tps->irq_data); +} + +static const struct i2c_device_id tps65086_id_table[] = { + { "tps65086" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, tps65086_id_table); + +static struct i2c_driver tps65086_driver = { + .driver = { + .name = "tps65086", + .of_match_table = tps65086_of_match_table, + }, + .probe = tps65086_probe, + .remove = tps65086_remove, + .id_table = tps65086_id_table, +}; +module_i2c_driver(tps65086_driver); + +MODULE_AUTHOR("Andrew F. Davis "); +MODULE_DESCRIPTION("TPS65086 PMIC Driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1