Author: kib
Date: Sun Nov 3 11:52:50 2019
New Revision: 354281
URL: https://svnweb.freebsd.org/changeset/base/354281
Log:
amd64: Store %cr3 into pcpu saved_ucr3 on double fault.
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/amd64/amd64/exception.S
Modified: head/sys/amd64/amd64/exception.S
==============================================================================
--- head/sys/amd64/amd64/exception.S Sun Nov 3 11:51:53 2019
(r354280)
+++ head/sys/amd64/amd64/exception.S Sun Nov 3 11:52:50 2019
(r354281)
@@ -349,6 +349,8 @@ IDTVEC(dblfault)
jz 1f /* already running with kernel GS.base
*/
swapgs
1: lfence
+ movq %cr3,%rax
+ movq %rax,PCPU(SAVED_UCR3)
movq PCPU(KCR3),%rax
cmpq $~0,%rax
je 2f
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