This is the backport of recently upstreamed series that moves VERW
execution to a later point in exit-to-user path. This is needed because
in some cases it may be possible for data accessed after VERW executions
may end into MDS affected CPU buffers. Moving VERW closer to ring
transition reduces the attack surface.
- The series includes a dependency commit f87bc8dc7a7c ("x86/asm: Add
_ASM_RIP() macro for x86-64 (%rip) suffix").
- Patch 2 includes a change that adds runtime patching for jmp (instead
of verw in original series) due to lack of rip-relative relocation
support in kernels <v6.5.
- Fixed warning:
arch/x86/entry/entry.o: warning: objtool: mds_verw_sel+0x0: unreachable instruction.
- Resolved merge conflicts in:
swapgs_restore_regs_and_return_to_usermode in entry_64.S.
__vmx_vcpu_run in vmenter.S.
vmx_update_fb_clear_dis in vmx.c.
- Boot tested with KASLR and KPTI enabled.
- Verified VERW being executed with mitigation ON, and not being
executed with mitigation turned OFF.
To: stable@xxxxxxxxxxxxxxx
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>
---
H. Peter Anvin (Intel) (1):
x86/asm: Add _ASM_RIP() macro for x86-64 (%rip) suffix
Pawan Gupta (5):
x86/bugs: Add asm helpers for executing VERW
x86/entry_64: Add VERW just before userspace transition
x86/entry_32: Add VERW just before userspace transition
x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key
KVM/VMX: Move VERW closer to VMentry for MDS mitigation
Sean Christopherson (1):
KVM/VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH
Documentation/x86/mds.rst | 38 +++++++++++++++++++++++++-----------
arch/x86/entry/entry.S | 23 ++++++++++++++++++++++
arch/x86/entry/entry_32.S | 3 +++
arch/x86/entry/entry_64.S | 11 +++++++++++
arch/x86/entry/entry_64_compat.S | 1 +
arch/x86/include/asm/asm.h | 5 +++++
arch/x86/include/asm/cpufeatures.h | 2 +-
arch/x86/include/asm/entry-common.h | 1 -
arch/x86/include/asm/nospec-branch.h | 27 +++++++++++++------------
arch/x86/kernel/cpu/bugs.c | 15 ++++++--------
arch/x86/kernel/nmi.c | 3 ---
arch/x86/kvm/vmx/run_flags.h | 7 +++++--
arch/x86/kvm/vmx/vmenter.S | 9 ++++++---
arch/x86/kvm/vmx/vmx.c | 12 ++++++++----
14 files changed, 111 insertions(+), 46 deletions(-)
---
base-commit: 80efc6265290d34b75921bf7294e0d9c5a8749dc
change-id: 20240304-delay-verw-backport-5-15-y-e16f07fbb71e
Best regards,
--
Thanks,
Pawan
