On 07/30/2015 02:14 PM, Andy Lutomirski wrote:
On Thu, Jul 30, 2015 at 10:56 AM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
On 07/28/2015 01:29 AM, Andy Lutomirski wrote:
+
+static inline void load_mm_ldt(struct mm_struct *mm)
+{
+ struct ldt_struct *ldt;
+ DEBUG_LOCKS_WARN_ON(!irqs_disabled());
I thought this was supposed to be checking preemptible()?
v6 fixes that. Check your future inbox :) I'm goint to rework the
Xen bit too based on the long discussion.
Is that the only failure you're seeing?
Yes.
ldt_gdt_32 passes on 64-bit for me
With your patch:
root@haswell> uname -a
Linux dhcp-burlington7-2nd-B-east-10-152-55-89.usdhcp.oraclecorp.com
4.2.0-rc4 #107 SMP Thu Jul 30 11:05:19 EDT 2015 x86_64 x86_64 x86_64
GNU/Linux
root@haswell> cd tmp/linux/tools/testing/selftests/x86/
root@haswell> ls -l ldt_gdt_32
-rwxr-xr-x 1 root root 25975 Jul 30 11:48 ldt_gdt_32
root@haswell> ./ldt_gdt_32
[OK] LDT entry 0 has AR 0x0040FA00 and limit 0x0000000A
[OK] LDT entry 0 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 1 is invalid
[OK] LDT entry 2 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 1 is invalid
[OK] LDT entry 2 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D0FA00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07A00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00907A00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07200 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07000 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07400 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00507600 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507E00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507C00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507A00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507800 and limit 0x0000000A
[RUN] Test fork
[OK] LDT entry 2 has AR 0x00507800 and limit 0x0000000A
[OK] LDT entry 1 is invalid
[OK] Child succeeded
[RUN] Test size
[DONE] Size test
[OK] modify_ldt failure 22
[OK] LDT entry 0 has AR 0x0000F200 and limit 0x00000000
[OK] LDT entry 0 has AR 0x00007200 and limit 0x00000000
[OK] LDT entry 0 has AR 0x0000F000 and limit 0x00000000
[OK] LDT entry 0 has AR 0x00007200 and limit 0x00000000
[OK] LDT entry 0 has AR 0x00007000 and limit 0x00000001
[OK] LDT entry 0 has AR 0x00007000 and limit 0x00000000
[OK] LDT entry 0 is invalid
[OK] LDT entry 0 has AR 0x0040F200 and limit 0x00000000
[OK] LDT entry 0 is invalid
[RUN] Cross-CPU LDT invalidation
Segmentation fault (core dumped)
root@haswell> dmesg | grep -i xen
[ 2.953815] xenfs: not registering filesystem on non-xen platform
[ 17.495141] IPv6: ADDRCONF(NETDEV_UP): xenbr0: link is not ready
[ 20.913839] xenbr0: port 1(eth0) entered forwarding state
[ 20.913907] xenbr0: port 1(eth0) entered forwarding state
[ 20.914044] IPv6: ADDRCONF(NETDEV_CHANGE): xenbr0: link becomes ready
On a slightly older kernel:
root@haswell> uname -a
Linux dhcp-burlington7-2nd-B-east-10-152-55-89.usdhcp.oraclecorp.com
4.1.0-rc2 #111 SMP Fri Jun 19 16:28:46 EDT 2015 x86_64 x86_64 x86_64
GNU/Linux
root@haswell> cd tmp/linux/tools/testing/selftests/x86/
root@haswell> ls -l ldt_gdt_32
-rwxr-xr-x 1 root root 25975 Jul 30 11:48 ldt_gdt_32
root@haswell> ./ldt_gdt_32
[OK] LDT entry 0 has AR 0x0040FA00 and limit 0x0000000A
[OK] LDT entry 0 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 1 is invalid
[OK] LDT entry 2 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 1 is invalid
[OK] LDT entry 2 has AR 0x00C0FA00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D0FA00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07A00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00907A00 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07200 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07000 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00D07400 and limit 0x0000AFFF
[OK] LDT entry 2 has AR 0x00507600 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507E00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507C00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507A00 and limit 0x0000000A
[OK] LDT entry 2 has AR 0x00507800 and limit 0x0000000A
[RUN] Test fork
[OK] LDT entry 2 has AR 0x00507800 and limit 0x0000000A
[OK] LDT entry 1 is invalid
[OK] Child succeeded
[RUN] Test size
[DONE] Size test
[OK] modify_ldt failure 22
[OK] LDT entry 0 has AR 0x0000F200 and limit 0x00000000
[OK] LDT entry 0 has AR 0x00007200 and limit 0x00000000
[OK] LDT entry 0 has AR 0x0000F000 and limit 0x00000000
[OK] LDT entry 0 has AR 0x00007200 and limit 0x00000000
[OK] LDT entry 0 has AR 0x00007000 and limit 0x00000001
[OK] LDT entry 0 has AR 0x00007000 and limit 0x00000000
[OK] LDT entry 0 is invalid
[OK] LDT entry 0 has AR 0x0040F200 and limit 0x00000000
[OK] LDT entry 0 is invalid
[RUN] Cross-CPU LDT invalidation
[FAIL] 5 of 5 iterations failed
root@haswell> dmesg | grep -i xen
[ 2.971167] xenfs: not registering filesystem on non-xen platform
[ 17.144879] IPv6: ADDRCONF(NETDEV_UP): xenbr0: link is not ready
[ 20.588663] xenbr0: port 1(eth0) entered forwarding state
[ 20.588706] xenbr0: port 1(eth0) entered forwarding state
[ 20.588802] IPv6: ADDRCONF(NETDEV_CHANGE): xenbr0: link becomes ready
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html