From: Pawan Gupta pawan.kumar.gupta@linux.intel.com
[ Upstream commit a0e2dab44d22b913b4c228c8b52b2a104434b0b3 ] As done for entry_64, add support for executing VERW late in exit to user path for 32-bit mode.
Signed-off-by: Pawan Gupta pawan.kumar.gupta@linux.intel.com Signed-off-by: Dave Hansen dave.hansen@linux.intel.com Link: https://lore.kernel.org/all/20240213-delay-verw-v8-3-a6216d83edb7%40linux.in... Signed-off-by: Nikolay Borisov nik.borisov@suse.com --- arch/x86/entry/entry_32.S | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 740df9cc2196..45419307fa1a 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -1013,6 +1013,7 @@ ENTRY(entry_SYSENTER_32) BUG_IF_WRONG_CR3 no_user_check=1 popfl popl %eax + CLEAR_CPU_BUFFERS
/* * Return back to the vDSO, which will pop ecx and edx. @@ -1094,6 +1095,7 @@ ENTRY(entry_INT80_32)
/* Restore user state */ RESTORE_REGS pop=4 # skip orig_eax/error_code + CLEAR_CPU_BUFFERS .Lirq_return: /* * ARCH_HAS_MEMBARRIER_SYNC_CORE rely on IRET core serialization @@ -1567,6 +1569,7 @@ ENTRY(nmi)
/* Not on SYSENTER stack. */ call do_nmi + CLEAR_CPU_BUFFERS jmp .Lnmi_return
.Lnmi_from_sysenter_stack: