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/hack-coff.c | 80 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 arch/powerpc/boot/hack-coff.c (limited to 'arch/powerpc/boot/hack-coff.c') diff --git a/arch/powerpc/boot/hack-coff.c b/arch/powerpc/boot/hack-coff.c new file mode 100644 index 000000000..6bf0c9430 --- /dev/null +++ b/arch/powerpc/boot/hack-coff.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * hack-coff.c - hack the header of an xcoff file to fill in + * a few fields needed by the Open Firmware xcoff loader on + * Power Macs but not initialized by objcopy. + * + * Copyright (C) Paul Mackerras 1997. + */ +#include +#include +#include +#include +#include +#include "rs6000.h" + +#define AOUT_MAGIC 0x010b + +#define get_16be(x) ((((unsigned char *)(x))[0] << 8) \ + + ((unsigned char *)(x))[1]) +#define put_16be(x, v) (((unsigned char *)(x))[0] = (v) >> 8, \ + ((unsigned char *)(x))[1] = (v) & 0xff) +#define get_32be(x) ((((unsigned char *)(x))[0] << 24) \ + + (((unsigned char *)(x))[1] << 16) \ + + (((unsigned char *)(x))[2] << 8) \ + + ((unsigned char *)(x))[3]) + +int +main(int ac, char **av) +{ + int fd; + int i, nsect; + int aoutsz; + struct external_filehdr fhdr; + struct aouthdr aout; + struct external_scnhdr shdr; + + if (ac != 2) { + fprintf(stderr, "Usage: hack-coff coff-file\n"); + exit(1); + } + if ((fd = open(av[1], 2)) == -1) { + perror(av[2]); + exit(1); + } + if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr)) + goto readerr; + i = get_16be(fhdr.f_magic); + if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) { + fprintf(stderr, "%s: not an xcoff file\n", av[1]); + exit(1); + } + aoutsz = get_16be(fhdr.f_opthdr); + if (read(fd, &aout, aoutsz) != aoutsz) + goto readerr; + nsect = get_16be(fhdr.f_nscns); + for (i = 0; i < nsect; ++i) { + if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr)) + goto readerr; + if (strcmp(shdr.s_name, ".text") == 0) { + put_16be(aout.o_snentry, i+1); + put_16be(aout.o_sntext, i+1); + } else if (strcmp(shdr.s_name, ".data") == 0) { + put_16be(aout.o_sndata, i+1); + } else if (strcmp(shdr.s_name, ".bss") == 0) { + put_16be(aout.o_snbss, i+1); + } + } + put_16be(aout.magic, AOUT_MAGIC); + if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1 + || write(fd, &aout, aoutsz) != aoutsz) { + fprintf(stderr, "%s: write error\n", av[1]); + exit(1); + } + close(fd); + exit(0); + +readerr: + fprintf(stderr, "%s: read error or file too short\n", av[1]); + exit(1); +} -- cgit v1.3.1