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, 65 insertions, 0 deletions

diff --git a/arch/mips/bcm63xx/dev-usb-usbd.c b/arch/mips/bcm63xx/dev-usb-usbd.c
new file mode 100644
index 000000000..508bd9d8d
--- /dev/null
+++ b/arch/mips/bcm63xx/dev-usb-usbd.c
@@ -0,0 +1,65 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ * Copyright (C) 2012 Kevin Cernekee <cernekee@gmail.com>
+ * Copyright (C) 2012 Broadcom Corporation
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <bcm63xx_cpu.h>
+#include <bcm63xx_dev_usb_usbd.h>
+
+#define NUM_MMIO		2
+#define NUM_IRQ			7
+
+static struct resource usbd_resources[NUM_MMIO + NUM_IRQ];
+
+static u64 usbd_dmamask = DMA_BIT_MASK(32);
+
+static struct platform_device bcm63xx_usbd_device = {
+	.name		= "bcm63xx_udc",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(usbd_resources),
+	.resource	= usbd_resources,
+	.dev		= {
+		.dma_mask		= &usbd_dmamask,
+		.coherent_dma_mask	= DMA_BIT_MASK(32),
+	},
+};
+
+int __init bcm63xx_usbd_register(const struct bcm63xx_usbd_platform_data *pd)
+{
+	const int irq_list[NUM_IRQ] = { IRQ_USBD,
+		IRQ_USBD_RXDMA0, IRQ_USBD_TXDMA0,
+		IRQ_USBD_RXDMA1, IRQ_USBD_TXDMA1,
+		IRQ_USBD_RXDMA2, IRQ_USBD_TXDMA2 };
+	int i;
+
+	if (!BCMCPU_IS_6328() && !BCMCPU_IS_6368())
+		return 0;
+
+	usbd_resources[0].start = bcm63xx_regset_address(RSET_USBD);
+	usbd_resources[0].end = usbd_resources[0].start + RSET_USBD_SIZE - 1;
+	usbd_resources[0].flags = IORESOURCE_MEM;
+
+	usbd_resources[1].start = bcm63xx_regset_address(RSET_USBDMA);
+	usbd_resources[1].end = usbd_resources[1].start + RSET_USBDMA_SIZE - 1;
+	usbd_resources[1].flags = IORESOURCE_MEM;
+
+	for (i = 0; i < NUM_IRQ; i++) {
+		struct resource *r = &usbd_resources[NUM_MMIO + i];
+
+		r->start = r->end = bcm63xx_get_irq_number(irq_list[i]);
+		r->flags = IORESOURCE_IRQ;
+	}
+
+	platform_device_add_data(&bcm63xx_usbd_device, pd, sizeof(*pd));
+
+	return platform_device_register(&bcm63xx_usbd_device);
+}