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/dec/tc.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 arch/mips/dec/tc.c (limited to 'arch/mips/dec/tc.c') diff --git a/arch/mips/dec/tc.c b/arch/mips/dec/tc.c new file mode 100644 index 000000000..dba583976 --- /dev/null +++ b/arch/mips/dec/tc.c @@ -0,0 +1,95 @@ +/* + * TURBOchannel architecture calls. + * + * Copyright (c) Harald Koerfgen, 1998 + * Copyright (c) 2001, 2003, 2005, 2006 Maciej W. Rozycki + * Copyright (c) 2005 James Simmons + * + * 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. + */ +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include + +/* + * Protected read byte from TURBOchannel slot space. + */ +int tc_preadb(u8 *valp, void __iomem *addr) +{ + return get_dbe(*valp, (u8 *)addr); +} + +/* + * Get TURBOchannel bus information as specified by the spec, plus + * the slot space base address and the number of slots. + */ +int __init tc_bus_get_info(struct tc_bus *tbus) +{ + if (!dec_tc_bus) + return -ENXIO; + + memcpy(&tbus->info, rex_gettcinfo(), sizeof(tbus->info)); + tbus->slot_base = CPHYSADDR((long)rex_slot_address(0)); + + switch (mips_machtype) { + case MACH_DS5000_200: + tbus->num_tcslots = 7; + break; + case MACH_DS5000_2X0: + case MACH_DS5900: + tbus->ext_slot_base = 0x20000000; + tbus->ext_slot_size = 0x20000000; + fallthrough; + case MACH_DS5000_1XX: + tbus->num_tcslots = 3; + break; + case MACH_DS5000_XX: + tbus->num_tcslots = 2; + default: + break; + } + return 0; +} + +/* + * Get the IRQ for the specified slot. + */ +void __init tc_device_get_irq(struct tc_dev *tdev) +{ + switch (tdev->slot) { + case 0: + tdev->interrupt = dec_interrupt[DEC_IRQ_TC0]; + break; + case 1: + tdev->interrupt = dec_interrupt[DEC_IRQ_TC1]; + break; + case 2: + tdev->interrupt = dec_interrupt[DEC_IRQ_TC2]; + break; + /* + * Yuck! DS5000/200 onboard devices + */ + case 5: + tdev->interrupt = dec_interrupt[DEC_IRQ_TC5]; + break; + case 6: + tdev->interrupt = dec_interrupt[DEC_IRQ_TC6]; + break; + default: + tdev->interrupt = -1; + break; + } +} -- cgit v1.3.1