Author: kib
Date: Sun Mar 17 18:31:48 2019
New Revision: 345246
URL: https://svnweb.freebsd.org/changeset/base/345246
Log:
i386: improve detection of the fast page fault assist.
In particular, check that we are assisting the page fault from kernel mode.
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Modified:
head/sys/i386/i386/exception.s
Modified: head/sys/i386/i386/exception.s
==============================================================================
--- head/sys/i386/i386/exception.s Sun Mar 17 18:06:13 2019
(r345245)
+++ head/sys/i386/i386/exception.s Sun Mar 17 18:31:48 2019
(r345246)
@@ -131,6 +131,10 @@ IDTVEC(prot)
pushl $T_PROTFLT
jmp irettraps
IDTVEC(page)
+ testl $PSL_VM, TF_EFLAGS-TF_ERR(%esp)
+ jnz 1f
+ testb $SEL_RPL_MASK, TF_CS-TF_ERR(%esp)
+ jnz 1f
cmpl $PMAP_TRM_MIN_ADDRESS, TF_EIP-TF_ERR(%esp)
jb 1f
movl %ebx, %cr3
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