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/bluetooth/btrsi.c | 186 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 186 insertions(+) create mode 100644 drivers/bluetooth/btrsi.c (limited to 'drivers/bluetooth/btrsi.c') diff --git a/drivers/bluetooth/btrsi.c b/drivers/bluetooth/btrsi.c new file mode 100644 index 000000000..3f802b7c8 --- /dev/null +++ b/drivers/bluetooth/btrsi.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: ISC +/* + * Copyright (c) 2017 Redpine Signals Inc. + * + */ +#include +#include +#include +#include +#include +#include + +#define RSI_DMA_ALIGN 8 +#define RSI_FRAME_DESC_SIZE 16 +#define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN) + +struct rsi_hci_adapter { + void *priv; + struct rsi_proto_ops *proto_ops; + struct hci_dev *hdev; +}; + +static int rsi_hci_open(struct hci_dev *hdev) +{ + return 0; +} + +static int rsi_hci_close(struct hci_dev *hdev) +{ + return 0; +} + +static int rsi_hci_flush(struct hci_dev *hdev) +{ + return 0; +} + +static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb) +{ + struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev); + struct sk_buff *new_skb = NULL; + + switch (hci_skb_pkt_type(skb)) { + case HCI_COMMAND_PKT: + hdev->stat.cmd_tx++; + break; + case HCI_ACLDATA_PKT: + hdev->stat.acl_tx++; + break; + case HCI_SCODATA_PKT: + hdev->stat.sco_tx++; + break; + } + + if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) { + /* Insufficient skb headroom - allocate a new skb */ + new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL); + if (unlikely(!new_skb)) + return -ENOMEM; + bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb); + kfree_skb(skb); + skb = new_skb; + if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) { + u8 *skb_data = skb->data; + int skb_len = skb->len; + + skb_push(skb, RSI_DMA_ALIGN); + skb_pull(skb, PTR_ALIGN(skb->data, + RSI_DMA_ALIGN) - skb->data); + memmove(skb->data, skb_data, skb_len); + skb_trim(skb, skb_len); + } + } + + return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb, + RSI_BT_Q); +} + +static int rsi_hci_recv_pkt(void *priv, const u8 *pkt) +{ + struct rsi_hci_adapter *h_adapter = priv; + struct hci_dev *hdev = h_adapter->hdev; + struct sk_buff *skb; + int pkt_len = get_unaligned_le16(pkt) & 0x0fff; + + skb = dev_alloc_skb(pkt_len); + if (!skb) + return -ENOMEM; + + memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len); + skb_put(skb, pkt_len); + h_adapter->hdev->stat.byte_rx += skb->len; + + hci_skb_pkt_type(skb) = pkt[14]; + + return hci_recv_frame(hdev, skb); +} + +static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops) +{ + struct rsi_hci_adapter *h_adapter = NULL; + struct hci_dev *hdev; + int err = 0; + + h_adapter = kzalloc_obj(*h_adapter); + if (!h_adapter) + return -ENOMEM; + + h_adapter->priv = priv; + h_adapter->proto_ops = ops; + + hdev = hci_alloc_dev(); + if (!hdev) { + BT_ERR("Failed to alloc HCI device"); + goto err; + } + + h_adapter->hdev = hdev; + + if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO) + hdev->bus = HCI_SDIO; + else + hdev->bus = HCI_USB; + + hci_set_drvdata(hdev, h_adapter); + hdev->open = rsi_hci_open; + hdev->close = rsi_hci_close; + hdev->flush = rsi_hci_flush; + hdev->send = rsi_hci_send_pkt; + + err = hci_register_dev(hdev); + if (err < 0) { + BT_ERR("HCI registration failed with errcode %d", err); + hci_free_dev(hdev); + goto err; + } + + ops->set_bt_context(priv, h_adapter); + + return 0; +err: + h_adapter->hdev = NULL; + kfree(h_adapter); + return -EINVAL; +} + +static void rsi_hci_detach(void *priv) +{ + struct rsi_hci_adapter *h_adapter = priv; + struct hci_dev *hdev; + + if (!h_adapter) + return; + + hdev = h_adapter->hdev; + if (hdev) { + hci_unregister_dev(hdev); + hci_free_dev(hdev); + h_adapter->hdev = NULL; + } + + kfree(h_adapter); +} + +const struct rsi_mod_ops rsi_bt_ops = { + .attach = rsi_hci_attach, + .detach = rsi_hci_detach, + .recv_pkt = rsi_hci_recv_pkt, +}; +EXPORT_SYMBOL(rsi_bt_ops); + +static int rsi_91x_bt_module_init(void) +{ + return 0; +} + +static void rsi_91x_bt_module_exit(void) +{ + return; +} + +module_init(rsi_91x_bt_module_init); +module_exit(rsi_91x_bt_module_exit); +MODULE_AUTHOR("Redpine Signals Inc"); +MODULE_DESCRIPTION("RSI BT driver"); +MODULE_LICENSE("Dual BSD/GPL"); -- cgit v1.3.1