KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted

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 <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 387 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/trace.h b/drivers/usb/dwc3/trace.h
new file mode 100644
index 000000000..5253da23d
--- /dev/null
+++ b/drivers/usb/dwc3/trace.h
@@ -0,0 +1,387 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * trace.h - DesignWare USB3 DRD Controller Trace Support
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com
+ *
+ * Author: Felipe Balbi <balbi@ti.com>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM dwc3
+
+#if !defined(__DWC3_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __DWC3_TRACE_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+#include <asm/byteorder.h>
+#include "core.h"
+#include "debug.h"
+
+DECLARE_EVENT_CLASS(dwc3_log_set_prtcap,
+	TP_PROTO(struct dwc3 *dwc, u32 mode),
+	TP_ARGS(dwc, mode),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__field(u32, mode)
+	),
+	TP_fast_assign(
+		__entry->base_address = dwc->xhci_resources[0].start;
+		__entry->mode = mode;
+	),
+	TP_printk("%pa: mode %s", &__entry->base_address, dwc3_mode_string(__entry->mode))
+);
+
+DEFINE_EVENT(dwc3_log_set_prtcap, dwc3_set_prtcap,
+	TP_PROTO(struct dwc3 *dwc, u32 mode),
+	TP_ARGS(dwc, mode)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_io,
+	TP_PROTO(struct dwc3 *dwc, void *base, u32 offset, u32 value),
+	TP_ARGS(dwc, base, offset, value),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__field(void *, base)
+		__field(u32, offset)
+		__field(u32, value)
+	),
+	TP_fast_assign(
+		__entry->base_address = dwc->xhci_resources[0].start;
+		__entry->base = base;
+		__entry->offset = offset;
+		__entry->value = value;
+	),
+	TP_printk("%pa: addr %p offset %04x value %08x",
+		&__entry->base_address,
+		__entry->base + __entry->offset,
+		__entry->offset,
+		__entry->value)
+);
+
+DEFINE_EVENT(dwc3_log_io, dwc3_readl,
+	TP_PROTO(struct dwc3 *dwc, void __iomem *base, u32 offset, u32 value),
+	TP_ARGS(dwc, base, offset, value)
+);
+
+DEFINE_EVENT(dwc3_log_io, dwc3_writel,
+	TP_PROTO(struct dwc3 *dwc, void __iomem *base, u32 offset, u32 value),
+	TP_ARGS(dwc, base, offset, value)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_event,
+	TP_PROTO(u32 event, struct dwc3 *dwc),
+	TP_ARGS(event, dwc),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__field(u32, event)
+		__field(u32, ep0state)
+	),
+	TP_fast_assign(
+		__entry->base_address = dwc->xhci_resources[0].start;
+		__entry->event = event;
+		__entry->ep0state = dwc->ep0state;
+	),
+	TP_printk("%pa: event (%08x): %s", &__entry->base_address, __entry->event,
+			dwc3_decode_event(__get_buf(DWC3_MSG_MAX), DWC3_MSG_MAX,
+					__entry->event, __entry->ep0state))
+);
+
+DEFINE_EVENT(dwc3_log_event, dwc3_event,
+	TP_PROTO(u32 event, struct dwc3 *dwc),
+	TP_ARGS(event, dwc)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_ctrl,
+	TP_PROTO(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl),
+	TP_ARGS(dwc, ctrl),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__field(__u8, bRequestType)
+		__field(__u8, bRequest)
+		__field(__u16, wValue)
+		__field(__u16, wIndex)
+		__field(__u16, wLength)
+	),
+	TP_fast_assign(
+		__entry->base_address = dwc->xhci_resources[0].start;
+		__entry->bRequestType = ctrl->bRequestType;
+		__entry->bRequest = ctrl->bRequest;
+		__entry->wValue = le16_to_cpu(ctrl->wValue);
+		__entry->wIndex = le16_to_cpu(ctrl->wIndex);
+		__entry->wLength = le16_to_cpu(ctrl->wLength);
+	),
+	TP_printk("%pa: %s", &__entry->base_address, usb_decode_ctrl(__get_buf(DWC3_MSG_MAX),
+					DWC3_MSG_MAX,
+					__entry->bRequestType,
+					__entry->bRequest, __entry->wValue,
+					__entry->wIndex, __entry->wLength)
+	)
+);
+
+DEFINE_EVENT(dwc3_log_ctrl, dwc3_ctrl_req,
+	TP_PROTO(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl),
+	TP_ARGS(dwc, ctrl)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_request,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__string(name, req->dep->name)
+		__field(struct dwc3_request *, req)
+		__field(unsigned int, actual)
+		__field(unsigned int, length)
+		__field(int, status)
+		__field(int, zero)
+		__field(int, short_not_ok)
+		__field(int, no_interrupt)
+	),
+	TP_fast_assign(
+		__entry->base_address = req->dep->dwc->xhci_resources[0].start;
+		__entry->req = req;
+		__entry->actual = req->request.actual;
+		__entry->length = req->request.length;
+		__entry->status = req->request.status;
+		__entry->zero = req->request.zero;
+		__entry->short_not_ok = req->request.short_not_ok;
+		__entry->no_interrupt = req->request.no_interrupt;
+	),
+	TP_printk("%pa: %s: req %p length %u/%u %s%s%s ==> %d",
+		&__entry->base_address,
+		__get_str(name), __entry->req,
+		__entry->actual, __entry->length,
+		__entry->zero ? "Z" : "z",
+		__entry->short_not_ok ? "S" : "s",
+		__entry->no_interrupt ? "i" : "I",
+		__entry->status
+	)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_alloc_request,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_free_request,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_ep_queue,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_ep_dequeue,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_gadget_giveback,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_generic_cmd,
+	TP_PROTO(struct dwc3 *dwc, unsigned int cmd, u32 param, int status),
+	TP_ARGS(dwc, cmd, param, status),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__field(unsigned int, cmd)
+		__field(u32, param)
+		__field(int, status)
+	),
+	TP_fast_assign(
+		__entry->base_address = dwc->xhci_resources[0].start;
+		__entry->cmd = cmd;
+		__entry->param = param;
+		__entry->status = status;
+	),
+	TP_printk("%pa: cmd '%s' [%x] param %08x --> status: %s",
+		&__entry->base_address, dwc3_gadget_generic_cmd_string(__entry->cmd),
+		__entry->cmd, __entry->param,
+		dwc3_gadget_generic_cmd_status_string(__entry->status)
+	)
+);
+
+DEFINE_EVENT(dwc3_log_generic_cmd, dwc3_gadget_generic_cmd,
+	TP_PROTO(struct dwc3 *dwc, unsigned int cmd, u32 param, int status),
+	TP_ARGS(dwc, cmd, param, status)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_gadget_ep_cmd,
+	TP_PROTO(struct dwc3_ep *dep, unsigned int cmd,
+		struct dwc3_gadget_ep_cmd_params *params, int cmd_status),
+	TP_ARGS(dep, cmd, params, cmd_status),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__string(name, dep->name)
+		__field(unsigned int, cmd)
+		__field(u32, param0)
+		__field(u32, param1)
+		__field(u32, param2)
+		__field(int, cmd_status)
+	),
+	TP_fast_assign(
+		__entry->base_address = dep->dwc->xhci_resources[0].start;
+		__assign_str(name);
+		__entry->cmd = cmd;
+		__entry->param0 = params->param0;
+		__entry->param1 = params->param1;
+		__entry->param2 = params->param2;
+		__entry->cmd_status = cmd_status;
+	),
+	TP_printk("%pa: %s: cmd '%s' [%x] params %08x %08x %08x --> status: %s",
+		&__entry->base_address, __get_str(name),
+		dwc3_gadget_ep_cmd_string(__entry->cmd),
+		__entry->cmd, __entry->param0,
+		__entry->param1, __entry->param2,
+		dwc3_ep_cmd_status_string(__entry->cmd_status)
+	)
+);
+
+DEFINE_EVENT(dwc3_log_gadget_ep_cmd, dwc3_gadget_ep_cmd,
+	TP_PROTO(struct dwc3_ep *dep, unsigned int cmd,
+		struct dwc3_gadget_ep_cmd_params *params, int cmd_status),
+	TP_ARGS(dep, cmd, params, cmd_status)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_trb,
+	TP_PROTO(struct dwc3_ep *dep, struct dwc3_trb *trb),
+	TP_ARGS(dep, trb),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__string(name, dep->name)
+		__field(struct dwc3_trb *, trb)
+		__field(u32, bpl)
+		__field(u32, bph)
+		__field(u32, size)
+		__field(u32, ctrl)
+		__field(u32, type)
+		__field(u32, enqueue)
+		__field(u32, dequeue)
+	),
+	TP_fast_assign(
+		__entry->base_address = dep->dwc->xhci_resources[0].start;
+		__assign_str(name);
+		__entry->trb = trb;
+		__entry->bpl = trb->bpl;
+		__entry->bph = trb->bph;
+		__entry->size = trb->size;
+		__entry->ctrl = trb->ctrl;
+		__entry->type = usb_endpoint_type(dep->endpoint.desc);
+		__entry->enqueue = dep->trb_enqueue;
+		__entry->dequeue = dep->trb_dequeue;
+	),
+	TP_printk("%pa: %s: trb %p (E%d:D%d) buf %08x%08x size %s%d ctrl %08x sofn %08x (%c%c%c%c:%c%c:%s)",
+		&__entry->base_address, __get_str(name), __entry->trb, __entry->enqueue,
+		__entry->dequeue, __entry->bph, __entry->bpl,
+		({char *s;
+		int pcm = ((__entry->size >> 24) & 3) + 1;
+
+		switch (__entry->type) {
+		case USB_ENDPOINT_XFER_INT:
+		case USB_ENDPOINT_XFER_ISOC:
+			switch (pcm) {
+			case 1:
+				s = "1x ";
+				break;
+			case 2:
+				s = "2x ";
+				break;
+			case 3:
+			default:
+				s = "3x ";
+				break;
+			}
+			break;
+		default:
+			s = "";
+		} s; }),
+		DWC3_TRB_SIZE_LENGTH(__entry->size), __entry->ctrl,
+		DWC3_TRB_CTRL_GET_SID_SOFN(__entry->ctrl),
+		__entry->ctrl & DWC3_TRB_CTRL_HWO ? 'H' : 'h',
+		__entry->ctrl & DWC3_TRB_CTRL_LST ? 'L' : 'l',
+		__entry->ctrl & DWC3_TRB_CTRL_CHN ? 'C' : 'c',
+		__entry->ctrl & DWC3_TRB_CTRL_CSP ? 'S' : 's',
+		__entry->ctrl & DWC3_TRB_CTRL_ISP_IMI ? 'S' : 's',
+		__entry->ctrl & DWC3_TRB_CTRL_IOC ? 'C' : 'c',
+		  dwc3_trb_type_string(DWC3_TRBCTL_TYPE(__entry->ctrl))
+	)
+);
+
+DEFINE_EVENT(dwc3_log_trb, dwc3_prepare_trb,
+	TP_PROTO(struct dwc3_ep *dep, struct dwc3_trb *trb),
+	TP_ARGS(dep, trb)
+);
+
+DEFINE_EVENT(dwc3_log_trb, dwc3_complete_trb,
+	TP_PROTO(struct dwc3_ep *dep, struct dwc3_trb *trb),
+	TP_ARGS(dep, trb)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_ep,
+	TP_PROTO(struct dwc3_ep *dep),
+	TP_ARGS(dep),
+	TP_STRUCT__entry(
+		__field(phys_addr_t, base_address)
+		__string(name, dep->name)
+		__field(unsigned int, maxpacket)
+		__field(unsigned int, maxpacket_limit)
+		__field(unsigned int, max_streams)
+		__field(unsigned int, maxburst)
+		__field(unsigned int, flags)
+		__field(unsigned int, direction)
+		__field(u8, trb_enqueue)
+		__field(u8, trb_dequeue)
+	),
+	TP_fast_assign(
+		__entry->base_address = dep->dwc->xhci_resources[0].start;
+		__assign_str(name);
+		__entry->maxpacket = dep->endpoint.maxpacket;
+		__entry->maxpacket_limit = dep->endpoint.maxpacket_limit;
+		__entry->max_streams = dep->endpoint.max_streams;
+		__entry->maxburst = dep->endpoint.maxburst;
+		__entry->flags = dep->flags;
+		__entry->direction = dep->direction;
+		__entry->trb_enqueue = dep->trb_enqueue;
+		__entry->trb_dequeue = dep->trb_dequeue;
+	),
+	TP_printk("%pa: %s: mps %d/%d streams %d burst %d ring %d/%d flags %c:%c%c%c%c:%c",
+		&__entry->base_address, __get_str(name), __entry->maxpacket,
+		__entry->maxpacket_limit, __entry->max_streams,
+		__entry->maxburst, __entry->trb_enqueue,
+		__entry->trb_dequeue,
+		__entry->flags & DWC3_EP_ENABLED ? 'E' : 'e',
+		__entry->flags & DWC3_EP_STALL ? 'S' : 's',
+		__entry->flags & DWC3_EP_WEDGE ? 'W' : 'w',
+		__entry->flags & DWC3_EP_TRANSFER_STARTED ? 'B' : 'b',
+		__entry->flags & DWC3_EP_PENDING_REQUEST ? 'P' : 'p',
+		__entry->direction ? '<' : '>'
+	)
+);
+
+DEFINE_EVENT(dwc3_log_ep, dwc3_gadget_ep_enable,
+	TP_PROTO(struct dwc3_ep *dep),
+	TP_ARGS(dep)
+);
+
+DEFINE_EVENT(dwc3_log_ep, dwc3_gadget_ep_disable,
+	TP_PROTO(struct dwc3_ep *dep),
+	TP_ARGS(dep)
+);
+
+#endif /* __DWC3_TRACE_H */
+
+/* this part has to be here */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+#include <trace/define_trace.h>