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/soc/versatile/Kconfig | 20 +++++ drivers/soc/versatile/Makefile | 3 + drivers/soc/versatile/soc-integrator.c | 150 +++++++++++++++++++++++++++++++++ drivers/soc/versatile/soc-realview.c | 144 +++++++++++++++++++++++++++++++ 4 files changed, 317 insertions(+) create mode 100644 drivers/soc/versatile/Kconfig create mode 100644 drivers/soc/versatile/Makefile create mode 100644 drivers/soc/versatile/soc-integrator.c create mode 100644 drivers/soc/versatile/soc-realview.c (limited to 'drivers/soc/versatile') diff --git a/drivers/soc/versatile/Kconfig b/drivers/soc/versatile/Kconfig new file mode 100644 index 000000000..7bbf54a8d --- /dev/null +++ b/drivers/soc/versatile/Kconfig @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# ARM Versatile SoC drivers +# +config SOC_INTEGRATOR_CM + bool "SoC bus device for the ARM Integrator platform core modules" + depends on ARCH_INTEGRATOR || COMPILE_TEST + select SOC_BUS + help + Include support for the SoC bus on the ARM Integrator platform + core modules providing some sysfs information about the ASIC + variant. + +config SOC_REALVIEW + bool "SoC bus device for the ARM RealView platforms" + depends on ARCH_REALVIEW || COMPILE_TEST + select SOC_BUS + help + Include support for the SoC bus on the ARM RealView platforms + providing some sysfs information about the ASIC variant. diff --git a/drivers/soc/versatile/Makefile b/drivers/soc/versatile/Makefile new file mode 100644 index 000000000..1e0a37c0a --- /dev/null +++ b/drivers/soc/versatile/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SOC_INTEGRATOR_CM) += soc-integrator.o +obj-$(CONFIG_SOC_REALVIEW) += soc-realview.o diff --git a/drivers/soc/versatile/soc-integrator.c b/drivers/soc/versatile/soc-integrator.c new file mode 100644 index 000000000..b67a7fd4a --- /dev/null +++ b/drivers/soc/versatile/soc-integrator.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2014 Linaro Ltd. + * + * Author: Linus Walleij + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#define INTEGRATOR_HDR_ID_OFFSET 0x00 + +static u32 integrator_coreid; + +static const struct of_device_id integrator_cm_match[] = { + { .compatible = "arm,core-module-integrator", }, + { } +}; + +static const char *integrator_arch_str(u32 id) +{ + switch ((id >> 16) & 0xff) { + case 0x00: + return "ASB little-endian"; + case 0x01: + return "AHB little-endian"; + case 0x03: + return "AHB-Lite system bus, bi-endian"; + case 0x04: + return "AHB"; + case 0x08: + return "AHB system bus, ASB processor bus"; + default: + return "Unknown"; + } +} + +static const char *integrator_fpga_str(u32 id) +{ + switch ((id >> 12) & 0xf) { + case 0x01: + return "XC4062"; + case 0x02: + return "XC4085"; + case 0x03: + return "XVC600"; + case 0x04: + return "EPM7256AE (Altera PLD)"; + default: + return "Unknown"; + } +} + +static ssize_t +manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%02x\n", integrator_coreid >> 24); +} + +static DEVICE_ATTR_RO(manufacturer); + +static ssize_t +arch_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid)); +} + +static DEVICE_ATTR_RO(arch); + +static ssize_t +fpga_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid)); +} + +static DEVICE_ATTR_RO(fpga); + +static ssize_t +build_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF); +} + +static DEVICE_ATTR_RO(build); + +static struct attribute *integrator_attrs[] = { + &dev_attr_manufacturer.attr, + &dev_attr_arch.attr, + &dev_attr_fpga.attr, + &dev_attr_build.attr, + NULL +}; + +ATTRIBUTE_GROUPS(integrator); + +static int __init integrator_soc_init(void) +{ + struct regmap *syscon_regmap; + struct soc_device *soc_dev; + struct soc_device_attribute *soc_dev_attr; + struct device_node *np; + struct device *dev; + u32 val; + int ret; + + np = of_find_matching_node(NULL, integrator_cm_match); + if (!np) + return -ENODEV; + + syscon_regmap = syscon_node_to_regmap(np); + of_node_put(np); + if (IS_ERR(syscon_regmap)) + return PTR_ERR(syscon_regmap); + + ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET, + &val); + if (ret) + return -ENODEV; + integrator_coreid = val; + + soc_dev_attr = kzalloc_obj(*soc_dev_attr); + if (!soc_dev_attr) + return -ENOMEM; + + soc_dev_attr->soc_id = "Integrator"; + soc_dev_attr->machine = "Integrator"; + soc_dev_attr->family = "Versatile"; + soc_dev_attr->custom_attr_group = integrator_groups[0]; + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) { + kfree(soc_dev_attr); + return -ENODEV; + } + dev = soc_device_to_device(soc_dev); + + dev_info(dev, "Detected ARM core module:\n"); + dev_info(dev, " Manufacturer: %02x\n", (val >> 24)); + dev_info(dev, " Architecture: %s\n", integrator_arch_str(val)); + dev_info(dev, " FPGA: %s\n", integrator_fpga_str(val)); + dev_info(dev, " Build: %02x\n", (val >> 4) & 0xFF); + dev_info(dev, " Rev: %c\n", ('A' + (val & 0x03))); + + return 0; +} +device_initcall(integrator_soc_init); diff --git a/drivers/soc/versatile/soc-realview.c b/drivers/soc/versatile/soc-realview.c new file mode 100644 index 000000000..cf91abe07 --- /dev/null +++ b/drivers/soc/versatile/soc-realview.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2014 Linaro Ltd. + * + * Author: Linus Walleij + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* System ID in syscon */ +#define REALVIEW_SYS_ID_OFFSET 0x00 + +static const struct of_device_id realview_soc_of_match[] = { + { .compatible = "arm,realview-eb-soc", }, + { .compatible = "arm,realview-pb1176-soc", }, + { .compatible = "arm,realview-pb11mp-soc", }, + { .compatible = "arm,realview-pba8-soc", }, + { .compatible = "arm,realview-pbx-soc", }, + { } +}; + +static u32 realview_coreid; + +static const char *realview_arch_str(u32 id) +{ + switch ((id >> 8) & 0xf) { + case 0x04: + return "AHB"; + case 0x05: + return "Multi-layer AXI"; + default: + return "Unknown"; + } +} + +static ssize_t +manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%02x\n", realview_coreid >> 24); +} + +static DEVICE_ATTR_RO(manufacturer); + +static ssize_t +board_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff)); +} + +static DEVICE_ATTR_RO(board); + +static ssize_t +fpga_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", realview_arch_str(realview_coreid)); +} + +static DEVICE_ATTR_RO(fpga); + +static ssize_t +build_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%02x\n", (realview_coreid & 0xFF)); +} + +static DEVICE_ATTR_RO(build); + +static struct attribute *realview_attrs[] = { + &dev_attr_manufacturer.attr, + &dev_attr_board.attr, + &dev_attr_fpga.attr, + &dev_attr_build.attr, + NULL +}; + +ATTRIBUTE_GROUPS(realview); + +static void realview_soc_socdev_release(void *data) +{ + struct soc_device *soc_dev = data; + + soc_device_unregister(soc_dev); +} + +static int realview_soc_probe(struct platform_device *pdev) +{ + struct regmap *syscon_regmap; + struct soc_device *soc_dev; + struct soc_device_attribute *soc_dev_attr; + struct device_node *np = pdev->dev.of_node; + int ret; + + syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap"); + if (IS_ERR(syscon_regmap)) + return PTR_ERR(syscon_regmap); + + soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr), GFP_KERNEL); + if (!soc_dev_attr) + return -ENOMEM; + + ret = of_property_read_string(np, "compatible", + &soc_dev_attr->soc_id); + if (ret) + return -EINVAL; + + soc_dev_attr->machine = "RealView"; + soc_dev_attr->family = "Versatile"; + soc_dev_attr->custom_attr_group = realview_groups[0]; + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) + return -ENODEV; + + ret = devm_add_action_or_reset(&pdev->dev, realview_soc_socdev_release, + soc_dev); + if (ret) + return ret; + + ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET, + &realview_coreid); + if (ret) + return -ENODEV; + + dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n", + realview_coreid, + ((realview_coreid >> 16) & 0xfff)); + /* FIXME: add attributes for SoC to sysfs */ + return 0; +} + +static struct platform_driver realview_soc_driver = { + .probe = realview_soc_probe, + .driver = { + .name = "realview-soc", + .of_match_table = realview_soc_of_match, + }, +}; +builtin_platform_driver(realview_soc_driver); -- cgit v1.3.1