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/hid/hid-axff.c | 177 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 177 insertions(+) create mode 100644 drivers/hid/hid-axff.c (limited to 'drivers/hid/hid-axff.c') diff --git a/drivers/hid/hid-axff.c b/drivers/hid/hid-axff.c new file mode 100644 index 000000000..2f4644708 --- /dev/null +++ b/drivers/hid/hid-axff.c @@ -0,0 +1,177 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Force feedback support for ACRUX game controllers + * + * From what I have gathered, these devices are mass produced in China + * by several vendors. They often share the same design as the original + * Xbox 360 controller. + * + * 1a34:0802 "ACRUX USB GAMEPAD 8116" + * - tested with an EXEQ EQ-PCU-02090 game controller. + * + * Copyright (c) 2010 Sergei Kolzun + */ + +/* + */ + +#include +#include +#include +#include + +#include "hid-ids.h" + +#ifdef CONFIG_HID_ACRUX_FF + +struct axff_device { + struct hid_report *report; +}; + +static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect) +{ + struct hid_device *hid = input_get_drvdata(dev); + struct axff_device *axff = data; + struct hid_report *report = axff->report; + int field_count = 0; + int left, right; + int i, j; + + left = effect->u.rumble.strong_magnitude; + right = effect->u.rumble.weak_magnitude; + + dbg_hid("called with 0x%04x 0x%04x", left, right); + + left = left * 0xff / 0xffff; + right = right * 0xff / 0xffff; + + for (i = 0; i < report->maxfield; i++) { + for (j = 0; j < report->field[i]->report_count; j++) { + report->field[i]->value[j] = + field_count % 2 ? right : left; + field_count++; + } + } + + dbg_hid("running with 0x%02x 0x%02x", left, right); + hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT); + + return 0; +} + +static int ax_input_configured(struct hid_device *hid, struct hid_input *hidinput) +{ + struct axff_device *axff; + struct hid_report *report; + struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; + struct input_dev *dev = hidinput->input; + int field_count = 0; + int i, j; + int error; + + if (!list_is_first(&hidinput->list, &hid->inputs)) + return 0; + + report = list_first_entry_or_null(report_list, struct hid_report, list); + if (!report) { + hid_err(hid, "no output reports found\n"); + return -ENODEV; + } + for (i = 0; i < report->maxfield; i++) { + for (j = 0; j < report->field[i]->report_count; j++) { + report->field[i]->value[j] = 0x00; + field_count++; + } + } + + if (field_count < 4 && hid->product != 0xf705) { + hid_err(hid, "not enough fields in the report: %d\n", + field_count); + return -ENODEV; + } + + axff = kzalloc_obj(struct axff_device); + if (!axff) + return -ENOMEM; + + axff->report = report; + set_bit(FF_RUMBLE, dev->ffbit); + + error = input_ff_create_memless(dev, axff, axff_play); + if (error) + goto err_free_mem; + + hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT); + + hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun \n"); + + return 0; + +err_free_mem: + kfree(axff); + return error; +} +#else +static inline int ax_input_configured(struct hid_device *hid, + struct hid_input *hidinput) +{ + return 0; +} +#endif + +static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + int error; + + dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n"); + + error = hid_parse(hdev); + if (error) { + hid_err(hdev, "parse failed\n"); + return error; + } + + error = hid_hw_start(hdev, HID_CONNECT_DEFAULT); + if (error) { + hid_err(hdev, "hw start failed\n"); + return error; + } + /* + * We need to start polling device right away, otherwise + * it will go into a coma. + */ + error = hid_hw_open(hdev); + if (error) { + dev_err(&hdev->dev, "hw open failed\n"); + hid_hw_stop(hdev); + return error; + } + + return 0; +} + +static void ax_remove(struct hid_device *hdev) +{ + hid_hw_close(hdev); + hid_hw_stop(hdev); +} + +static const struct hid_device_id ax_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), }, + { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), }, + { } +}; +MODULE_DEVICE_TABLE(hid, ax_devices); + +static struct hid_driver ax_driver = { + .name = "acrux", + .id_table = ax_devices, + .probe = ax_probe, + .remove = ax_remove, + .input_configured = ax_input_configured, +}; +module_hid_driver(ax_driver); + +MODULE_AUTHOR("Sergei Kolzun"); +MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1