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-razer.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 drivers/hid/hid-razer.c (limited to 'drivers/hid/hid-razer.c') diff --git a/drivers/hid/hid-razer.c b/drivers/hid/hid-razer.c new file mode 100644 index 000000000..7f48258c6 --- /dev/null +++ b/drivers/hid/hid-razer.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * HID driver for gaming keys on Razer Blackwidow gaming keyboards + * Macro Key Keycodes: M1 = 191, M2 = 192, M3 = 193, M4 = 194, M5 = 195 + * + * Copyright (c) 2021 Jelle van der Waa + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "hid-ids.h" + +#define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c)) + +#define RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE 91 + +static bool macro_key_remapping = 1; +module_param(macro_key_remapping, bool, 0644); +MODULE_PARM_DESC(macro_key_remapping, " on (Y) off (N)"); + + +static unsigned char blackwidow_init[RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE] = { + 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x04, + 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x04, 0x00 +}; + +static int razer_input_mapping(struct hid_device *hdev, + struct hid_input *hi, struct hid_field *field, + struct hid_usage *usage, unsigned long **bit, int *max) +{ + + if (!macro_key_remapping) + return 0; + + if ((usage->hid & HID_UP_KEYBOARD) != HID_UP_KEYBOARD) + return 0; + + switch (usage->hid & ~HID_UP_KEYBOARD) { + case 0x68: + map_key_clear(KEY_MACRO1); + return 1; + case 0x69: + map_key_clear(KEY_MACRO2); + return 1; + case 0x6a: + map_key_clear(KEY_MACRO3); + return 1; + case 0x6b: + map_key_clear(KEY_MACRO4); + return 1; + case 0x6c: + map_key_clear(KEY_MACRO5); + return 1; + } + + return 0; +} + +static int razer_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + char *buf; + int ret = 0; + + ret = hid_parse(hdev); + if (ret) + return ret; + + /* + * Only send the enable macro keys command for the third device + * identified as mouse input. + */ + if (hdev->type == HID_TYPE_USBMOUSE) { + buf = kmemdup(blackwidow_init, RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE, GFP_KERNEL); + if (buf == NULL) + return -ENOMEM; + + ret = hid_hw_raw_request(hdev, 0, buf, RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE, + HID_FEATURE_REPORT, HID_REQ_SET_REPORT); + if (ret != RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE) + hid_err(hdev, "failed to enable macro keys: %d\n", ret); + + kfree(buf); + } + + return hid_hw_start(hdev, HID_CONNECT_DEFAULT); +} + +static const struct hid_device_id razer_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, + USB_DEVICE_ID_RAZER_BLACKWIDOW) }, + { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, + USB_DEVICE_ID_RAZER_BLACKWIDOW_CLASSIC) }, + { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, + USB_DEVICE_ID_RAZER_BLACKWIDOW_ULTIMATE) }, + { } +}; +MODULE_DEVICE_TABLE(hid, razer_devices); + +static struct hid_driver razer_driver = { + .name = "razer", + .id_table = razer_devices, + .input_mapping = razer_input_mapping, + .probe = razer_probe, +}; +module_hid_driver(razer_driver); + +MODULE_AUTHOR("Jelle van der Waa "); +MODULE_DESCRIPTION("HID driver for gaming keys on Razer Blackwidow gaming keyboards"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1