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/hexagon/mm/cache.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 arch/hexagon/mm/cache.c (limited to 'arch/hexagon/mm/cache.c') diff --git a/arch/hexagon/mm/cache.c b/arch/hexagon/mm/cache.c new file mode 100644 index 000000000..7e46f40c8 --- /dev/null +++ b/arch/hexagon/mm/cache.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Cache management functions for Hexagon + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + */ + +#include +#include +#include + +#define spanlines(start, end) \ + (((end - (start & ~(LINESIZE - 1))) >> LINEBITS) + 1) + +void flush_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleaninva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + +void flush_icache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleana(%0); " + " icinva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + __asm__ __volatile__ ( + "isync" + ); + local_irq_restore(flags); +} +EXPORT_SYMBOL(flush_icache_range); + +void hexagon_clean_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleana(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + +void hexagon_inv_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dcinva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + + + + +/* + * This is just really brutal and shouldn't be used anyways, + * especially on V2. Left here just in case. + */ +void flush_cache_all_hexagon(void) +{ + unsigned long flags; + local_irq_save(flags); + __vmcache_ickill(); + __vmcache_dckill(); + __vmcache_l2kill(); + local_irq_restore(flags); + mb(); +} + +void copy_to_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, void *src, int len) +{ + memcpy(dst, src, len); + if (vma->vm_flags & VM_EXEC) { + flush_icache_range((unsigned long) dst, + (unsigned long) dst + len); + } +} -- cgit v1.3.1