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/powerpc/boot/of.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 arch/powerpc/boot/of.h (limited to 'arch/powerpc/boot/of.h') diff --git a/arch/powerpc/boot/of.h b/arch/powerpc/boot/of.h new file mode 100644 index 000000000..31b2f5dfd --- /dev/null +++ b/arch/powerpc/boot/of.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _PPC_BOOT_OF_H_ +#define _PPC_BOOT_OF_H_ + +#include "swab.h" + +typedef void *phandle; +typedef u32 ihandle; + +void of_init(void *promptr); +int of_call_prom(const char *service, int nargs, int nret, ...); +unsigned int of_claim(unsigned long virt, unsigned long size, + unsigned long align); +void *of_vmlinux_alloc(unsigned long size); +void of_exit(void); +void *of_finddevice(const char *name); +int of_getprop(const void *phandle, const char *name, void *buf, + const int buflen); +int of_setprop(const void *phandle, const char *name, const void *buf, + const int buflen); + +/* Console functions */ +void of_console_init(void); + +typedef u16 __be16; +typedef u32 __be32; +typedef u64 __be64; + +#ifdef __LITTLE_ENDIAN__ +#define cpu_to_be16(x) swab16(x) +#define be16_to_cpu(x) swab16(x) +#define cpu_to_be32(x) swab32(x) +#define be32_to_cpu(x) swab32(x) +#define cpu_to_be64(x) swab64(x) +#define be64_to_cpu(x) swab64(x) +#else +#define cpu_to_be16(x) (x) +#define be16_to_cpu(x) (x) +#define cpu_to_be32(x) (x) +#define be32_to_cpu(x) (x) +#define cpu_to_be64(x) (x) +#define be64_to_cpu(x) (x) +#endif + +#define PROM_ERROR (-1u) + +#endif /* _PPC_BOOT_OF_H_ */ -- cgit v1.3.1