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/rt5033.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 133 insertions(+) create mode 100644 drivers/mfd/rt5033.c (limited to 'drivers/mfd/rt5033.c') diff --git a/drivers/mfd/rt5033.c b/drivers/mfd/rt5033.c new file mode 100644 index 000000000..072fd4447 --- /dev/null +++ b/drivers/mfd/rt5033.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MFD core driver for the Richtek RT5033. + * + * RT5033 comprises multiple sub-devices switcing charger, fuel gauge, + * flash LED, current source, LDO and BUCK regulators. + * + * Copyright (C) 2014 Samsung Electronics, Co., Ltd. + * Author: Beomho Seo + */ + +#include +#include +#include +#include +#include +#include + +static const struct regmap_irq rt5033_irqs[] = { + { .mask = RT5033_PMIC_IRQ_BUCKOCP, }, + { .mask = RT5033_PMIC_IRQ_BUCKLV, }, + { .mask = RT5033_PMIC_IRQ_SAFELDOLV, }, + { .mask = RT5033_PMIC_IRQ_LDOLV, }, + { .mask = RT5033_PMIC_IRQ_OT, }, + { .mask = RT5033_PMIC_IRQ_VDDA_UV, }, +}; + +static const struct regmap_irq_chip rt5033_irq_chip = { + .name = "rt5033", + .status_base = RT5033_REG_PMIC_IRQ_STAT, + .unmask_base = RT5033_REG_PMIC_IRQ_CTRL, + .num_regs = 1, + .irqs = rt5033_irqs, + .num_irqs = ARRAY_SIZE(rt5033_irqs), +}; + +static const struct mfd_cell rt5033_devs[] = { + { .name = "rt5033-regulator", }, + { + .name = "rt5033-charger", + .of_compatible = "richtek,rt5033-charger", + }, { + .name = "rt5033-led", + .of_compatible = "richtek,rt5033-led", + }, +}; + +static const struct regmap_config rt5033_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT5033_REG_END, +}; + +static int rt5033_i2c_probe(struct i2c_client *i2c) +{ + struct rt5033_dev *rt5033; + unsigned int dev_id, chip_rev; + int ret; + + rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL); + if (!rt5033) + return -ENOMEM; + + i2c_set_clientdata(i2c, rt5033); + rt5033->dev = &i2c->dev; + rt5033->irq = i2c->irq; + rt5033->wakeup = true; + + rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config); + if (IS_ERR(rt5033->regmap)) { + dev_err(&i2c->dev, "Failed to allocate register map.\n"); + return PTR_ERR(rt5033->regmap); + } + + ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id); + if (ret) { + dev_err(&i2c->dev, "Device not found\n"); + return -ENODEV; + } + chip_rev = dev_id & RT5033_CHIP_REV_MASK; + dev_info(&i2c->dev, "Device found (rev. %d)\n", chip_rev); + + ret = devm_regmap_add_irq_chip(rt5033->dev, rt5033->regmap, + rt5033->irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + 0, &rt5033_irq_chip, &rt5033->irq_data); + if (ret) { + dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n", + rt5033->irq, ret); + return ret; + } + + ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs, + ARRAY_SIZE(rt5033_devs), NULL, 0, + regmap_irq_get_domain(rt5033->irq_data)); + if (ret < 0) { + dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n"); + return ret; + } + + if (rt5033->wakeup) { + ret = devm_device_init_wakeup(rt5033->dev); + if (ret) + return dev_err_probe(rt5033->dev, ret, "Failed to init wakeup\n"); + } + + return 0; +} + +static const struct i2c_device_id rt5033_i2c_id[] = { + { "rt5033", }, + { } +}; +MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id); + +static const struct of_device_id rt5033_dt_match[] = { + { .compatible = "richtek,rt5033", }, + { } +}; +MODULE_DEVICE_TABLE(of, rt5033_dt_match); + +static struct i2c_driver rt5033_driver = { + .driver = { + .name = "rt5033", + .of_match_table = rt5033_dt_match, + }, + .probe = rt5033_i2c_probe, + .id_table = rt5033_i2c_id, +}; +module_i2c_driver(rt5033_driver); + +MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver"); +MODULE_AUTHOR("Beomho Seo "); +MODULE_LICENSE("GPL"); -- cgit v1.3.1