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 --- drivers/net/wireguard/generated/netlink.c | 73 +++++++++++++++++++++++++++++++ drivers/net/wireguard/generated/netlink.h | 30 +++++++++++++ 2 files changed, 103 insertions(+) create mode 100644 drivers/net/wireguard/generated/netlink.c create mode 100644 drivers/net/wireguard/generated/netlink.h (limited to 'drivers/net/wireguard/generated') diff --git a/drivers/net/wireguard/generated/netlink.c b/drivers/net/wireguard/generated/netlink.c new file mode 100644 index 000000000..3ef8c2990 --- /dev/null +++ b/drivers/net/wireguard/generated/netlink.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) +/* Do not edit directly, auto-generated from: */ +/* Documentation/netlink/specs/wireguard.yaml */ +/* YNL-GEN kernel source */ +/* YNL-ARG --function-prefix wg */ +/* To regenerate run: tools/net/ynl/ynl-regen.sh */ + +#include +#include + +#include "netlink.h" + +#include +#include + +/* Common nested types */ +const struct nla_policy wireguard_wgallowedip_nl_policy[WGALLOWEDIP_A_FLAGS + 1] = { + [WGALLOWEDIP_A_FAMILY] = { .type = NLA_U16, }, + [WGALLOWEDIP_A_IPADDR] = NLA_POLICY_MIN_LEN(4), + [WGALLOWEDIP_A_CIDR_MASK] = { .type = NLA_U8, }, + [WGALLOWEDIP_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x1), +}; + +const struct nla_policy wireguard_wgpeer_nl_policy[WGPEER_A_PROTOCOL_VERSION + 1] = { + [WGPEER_A_PUBLIC_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN), + [WGPEER_A_PRESHARED_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN), + [WGPEER_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x7), + [WGPEER_A_ENDPOINT] = NLA_POLICY_MIN_LEN(16), + [WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL] = { .type = NLA_U16, }, + [WGPEER_A_LAST_HANDSHAKE_TIME] = NLA_POLICY_EXACT_LEN(16), + [WGPEER_A_RX_BYTES] = { .type = NLA_U64, }, + [WGPEER_A_TX_BYTES] = { .type = NLA_U64, }, + [WGPEER_A_ALLOWEDIPS] = NLA_POLICY_NESTED_ARRAY(wireguard_wgallowedip_nl_policy), + [WGPEER_A_PROTOCOL_VERSION] = { .type = NLA_U32, }, +}; + +/* WG_CMD_GET_DEVICE - dump */ +static const struct nla_policy wireguard_get_device_nl_policy[WGDEVICE_A_IFNAME + 1] = { + [WGDEVICE_A_IFINDEX] = { .type = NLA_U32, }, + [WGDEVICE_A_IFNAME] = { .type = NLA_NUL_STRING, .len = 15, }, +}; + +/* WG_CMD_SET_DEVICE - do */ +static const struct nla_policy wireguard_set_device_nl_policy[WGDEVICE_A_PEERS + 1] = { + [WGDEVICE_A_IFINDEX] = { .type = NLA_U32, }, + [WGDEVICE_A_IFNAME] = { .type = NLA_NUL_STRING, .len = 15, }, + [WGDEVICE_A_PRIVATE_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN), + [WGDEVICE_A_PUBLIC_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN), + [WGDEVICE_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x1), + [WGDEVICE_A_LISTEN_PORT] = { .type = NLA_U16, }, + [WGDEVICE_A_FWMARK] = { .type = NLA_U32, }, + [WGDEVICE_A_PEERS] = NLA_POLICY_NESTED_ARRAY(wireguard_wgpeer_nl_policy), +}; + +/* Ops table for wireguard */ +const struct genl_split_ops wireguard_nl_ops[2] = { + { + .cmd = WG_CMD_GET_DEVICE, + .start = wg_get_device_start, + .dumpit = wg_get_device_dumpit, + .done = wg_get_device_done, + .policy = wireguard_get_device_nl_policy, + .maxattr = WGDEVICE_A_IFNAME, + .flags = GENL_UNS_ADMIN_PERM | GENL_CMD_CAP_DUMP, + }, + { + .cmd = WG_CMD_SET_DEVICE, + .doit = wg_set_device_doit, + .policy = wireguard_set_device_nl_policy, + .maxattr = WGDEVICE_A_PEERS, + .flags = GENL_UNS_ADMIN_PERM | GENL_CMD_CAP_DO, + }, +}; diff --git a/drivers/net/wireguard/generated/netlink.h b/drivers/net/wireguard/generated/netlink.h new file mode 100644 index 000000000..5dc977ee9 --- /dev/null +++ b/drivers/net/wireguard/generated/netlink.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */ +/* Do not edit directly, auto-generated from: */ +/* Documentation/netlink/specs/wireguard.yaml */ +/* YNL-GEN kernel header */ +/* YNL-ARG --function-prefix wg */ +/* To regenerate run: tools/net/ynl/ynl-regen.sh */ + +#ifndef _LINUX_WIREGUARD_GEN_H +#define _LINUX_WIREGUARD_GEN_H + +#include +#include + +#include +#include + +/* Common nested types */ +extern const struct nla_policy wireguard_wgallowedip_nl_policy[WGALLOWEDIP_A_FLAGS + 1]; +extern const struct nla_policy wireguard_wgpeer_nl_policy[WGPEER_A_PROTOCOL_VERSION + 1]; + +/* Ops table for wireguard */ +extern const struct genl_split_ops wireguard_nl_ops[2]; + +int wg_get_device_start(struct netlink_callback *cb); +int wg_get_device_done(struct netlink_callback *cb); + +int wg_get_device_dumpit(struct sk_buff *skb, struct netlink_callback *cb); +int wg_set_device_doit(struct sk_buff *skb, struct genl_info *info); + +#endif /* _LINUX_WIREGUARD_GEN_H */ -- cgit v1.3.1