kvm_intel: L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
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WARNING: CPU: 1 PID: 6623 at arch/x86/kvm/../../../virt/kvm/pfncache.c:267 __kvm_gpc_refresh+0x1187/0x1310 virt/kvm/pfncache.c:267
Modules linked in:
CPU: 1 UID: 0 PID: 6623 Comm: syz.0.16 Not tainted 6.15.0-rc7-next-20250523-syzkaller-g176e917e010c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__kvm_gpc_refresh+0x1187/0x1310 virt/kvm/pfncache.c:267
Code: c6 05 46 d6 4a 0e 01 48 c7 c7 8d a1 96 8d be 24 04 00 00 48 c7 c2 a0 ec 81 8b e8 e4 23 5e 00 e9 fe f1 ff ff e8 6a 1b 80 00 90 <0f> 0b 90 bb ea ff ff ff e9 7e fe ff ff e8 57 1b 80 00 90 0f 0b 90
RSP: 0018:ffffc900036871c0 EFLAGS: 00010293
RAX: ffffffff814027c6 RBX: ffff888000000000 RCX: ffff8880272c8000
RDX: 0000000000000000 RSI: ffff888000000000 RDI: ffff888000000000
RBP: ffffc90003687348 R08: ffffffff8fa12ef7 R09: 1ffffffff1f425de
R10: dffffc0000000000 R11: fffffbfff1f425df R12: ffffc900032173c0
R13: dffffc0000000000 R14: ffff888000000000 R15: ffffffffffffff01
FS:  00007f78ea4286c0(0000) GS:ffff888125d56000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f5ffff CR3: 0000000077382000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_gpc_refresh+0xe1/0x110 virt/kvm/pfncache.c:382
 kvm_xen_set_evtchn+0x164/0x230 arch/x86/kvm/xen.c:1942
 kvm_xen_hvm_evtchn_send+0x120/0x1e0 arch/x86/kvm/xen.c:2022
 kvm_arch_vm_ioctl+0xe3d/0x16f0 arch/x86/kvm/x86.c:7315
 kvm_vm_ioctl+0x85f/0xc60 virt/kvm/kvm_main.c:5301
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f78e958d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f78ea428038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f78e97a5fa0 RCX: 00007f78e958d169
RDX: 0000400000000180 RSI: 00000000400caed0 RDI: 0000000000000001
RBP: 00007f78e960e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f78e97a5fa0 R15: 00007ffd0cdb2b08
 </TASK>