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| author | Sean Christopherson <seanjc@google.com> | 2026-09-23 09:37:21 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2026-09-26 00:39:55 -0400 |
| commit | 93de2a6a4b91b72607136dd656edf03fb399d27f (patch) | |
| tree | 9220c76eb23cb39a146fac9692ee69afa4aa3135 /drivers/net/arcnet/com9026.h | |
| download | linux-stable-93de2a6a4b91b72607136dd656edf03fb399d27f.tar.gz linux-stable-93de2a6a4b91b72607136dd656edf03fb399d27f.zip | |
KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted
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 <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'drivers/net/arcnet/com9026.h')
| -rw-r--r-- | drivers/net/arcnet/com9026.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/arcnet/com9026.h b/drivers/net/arcnet/com9026.h new file mode 100644 index 000000000..6adbc1871 --- /dev/null +++ b/drivers/net/arcnet/com9026.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __COM9026_H +#define __COM9026_H + +/* COM 9026 controller chip --> ARCnet register addresses */ + +#define COM9026_REG_W_INTMASK 0 /* writable */ +#define COM9026_REG_R_STATUS 0 /* readable */ +#define COM9026_REG_W_COMMAND 1 /* writable, returns random vals on read (?) */ +#define COM9026_REG_RW_CONFIG 2 /* Configuration register */ +#define COM9026_REG_R_RESET 8 /* software reset (on read) */ +#define COM9026_REG_RW_MEMDATA 12 /* Data port for IO-mapped memory */ +#define COM9026_REG_W_ADDR_LO 14 /* Control registers for said */ +#define COM9026_REG_W_ADDR_HI 15 + +#define COM9026_REG_R_STATION 1 /* Station ID */ + +#endif |