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 --- arch/mips/mobileye/Kconfig | 29 +++++++++++++++++++++++++++++ arch/mips/mobileye/Makefile | 1 + arch/mips/mobileye/Platform | 17 +++++++++++++++++ arch/mips/mobileye/board-epm5.its.S | 24 ++++++++++++++++++++++++ arch/mips/mobileye/vmlinux.its.S | 32 ++++++++++++++++++++++++++++++++ 5 files changed, 103 insertions(+) create mode 100644 arch/mips/mobileye/Kconfig create mode 100644 arch/mips/mobileye/Makefile create mode 100644 arch/mips/mobileye/Platform create mode 100644 arch/mips/mobileye/board-epm5.its.S create mode 100644 arch/mips/mobileye/vmlinux.its.S (limited to 'arch/mips/mobileye') diff --git a/arch/mips/mobileye/Kconfig b/arch/mips/mobileye/Kconfig new file mode 100644 index 000000000..8a4868d2e --- /dev/null +++ b/arch/mips/mobileye/Kconfig @@ -0,0 +1,29 @@ +# SPDX-License-Identifier: GPL-2.0 +if EYEQ + +choice + prompt "Mobileye EyeQ SoC selection" + default MACH_EYEQ5 + help + Select Mobileye EyeQ MIPS SoC type. + + config MACH_EYEQ5 + bool "Mobileye EyeQ5 SoC" + + config MACH_EYEQ6H + bool "Mobileye EyeQ6H SoC" + + config MACH_EYEQ6LPLUS + bool "Mobileye EyeQ6Lplus SoC" +endchoice + +config FIT_IMAGE_FDT_EPM5 + bool "Include FDT for Mobileye EyeQ5 development platforms" + depends on MACH_EYEQ5 + default n + help + Enable this to include the FDT for the EyeQ5 development platforms + from Mobileye in the FIT kernel image. + This requires u-boot on the platform. + +endif diff --git a/arch/mips/mobileye/Makefile b/arch/mips/mobileye/Makefile new file mode 100644 index 000000000..315c06b68 --- /dev/null +++ b/arch/mips/mobileye/Makefile @@ -0,0 +1 @@ +# SPDX-License-Identifier: GPL-2.0-or-later diff --git a/arch/mips/mobileye/Platform b/arch/mips/mobileye/Platform new file mode 100644 index 000000000..93b533492 --- /dev/null +++ b/arch/mips/mobileye/Platform @@ -0,0 +1,17 @@ +# +# Copyright (C) 2016 Imagination Technologies +# Author: Paul Burton +# +# This program is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation; either version 2 of the License, or (at your +# option) any later version. +# + +load-$(CONFIG_MACH_EYEQ5) = 0xa800000808000000 +load-$(CONFIG_MACH_EYEQ6H) = 0xa800000100800000 +load-$(CONFIG_MACH_EYEQ6LPLUS) = 0xa800000108800000 +all-$(CONFIG_MACH_EYEQ5) += vmlinux.gz.itb + +its-y := vmlinux.its.S +its-$(CONFIG_FIT_IMAGE_FDT_EPM5) += board-epm5.its.S diff --git a/arch/mips/mobileye/board-epm5.its.S b/arch/mips/mobileye/board-epm5.its.S new file mode 100644 index 000000000..08e8c4f18 --- /dev/null +++ b/arch/mips/mobileye/board-epm5.its.S @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */ +/ { + images { + fdt-mobileye-epm5 { + description = "Mobileeye MP5 Device Tree"; + data = /incbin/("boot/dts/mobileye/eyeq5-epm5.dtb"); + type = "flat_dt"; + arch = "mips"; + compression = "none"; + hash { + algo = "sha1"; + }; + }; + }; + + configurations { + default = "conf-1"; + conf-1 { + description = "Mobileye EPM5 Linux kernel"; + kernel = "kernel"; + fdt = "fdt-mobileye-epm5"; + }; + }; +}; diff --git a/arch/mips/mobileye/vmlinux.its.S b/arch/mips/mobileye/vmlinux.its.S new file mode 100644 index 000000000..3e2546765 --- /dev/null +++ b/arch/mips/mobileye/vmlinux.its.S @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/dts-v1/; + +/ { + description = KERNEL_NAME; + #address-cells = ; + + images { + kernel { + description = KERNEL_NAME; + data = /incbin/(VMLINUX_BINARY); + type = "kernel"; + arch = "mips"; + os = "linux"; + compression = VMLINUX_COMPRESSION; + load = /bits/ ADDR_BITS ; + entry = /bits/ ADDR_BITS ; + hash { + algo = "sha1"; + }; + }; + }; + + configurations { + default = "conf-default"; + + conf-default { + description = "Generic Linux kernel"; + kernel = "kernel"; + }; + }; +}; -- cgit v1.3.1