** Description changed:
[Impact]
rdpru test in ubuntu_kvm_unit_tests is to check if the RDPRU instruction can
be intercepted by the Hypervisor.
RDPRU is one of the new instruction set extensions of AMD "Zen 2" CPUs
that is for reading a processor register that is typically limited to
privilege level zero. RDPRU allows for reading select registers at any
privilege level. With Linux 5.5, the RDPRU presence will be advertised
by the CPU features.
Without this patchset, the rdpru test will fail on our AMD Zen 2 system
"riccioli"
[Fix]
+ * fb64f293 x86/cpufeatures: Add feature bit RDPRU on AMD
* 0cb8410b kvm: svm: Intercept RDPRU
- We have this patch in newer releases already, only Bionic 4.15 require
- this fix. And it can be cherry-picked without any conflict.
+ We have these patches in newer releases already, only Bionic 4.15
+ require this fix. And it can be cherry-picked without any conflict.
[Test]
With the patched kernel, this rdpru test will pass on the target AMD Zen 2
system.
And the rdpru flag will be available in cpuinfo:
- flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm
constant_tsc rep_good nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf
pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes
xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a
misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core
perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 invpcid_single hw_pstate
ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm
rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves
cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr
rdpru arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid
decodeassists pausefilter pfthreshold v_vmsave_vmload vgif umip pku ospke vaes
vpclmulqdq rdpid overflow_recov succor smca
- bugs : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
+ $ grep rdpru /proc/cpuinfo
+ flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb
rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid extd_apicid
aperfmperf pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe
popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core
perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 invpcid_single hw_pstate
ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm
rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves
cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr
rdpru arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid
decodeassists pausefilter pfthreshold v_vmsave_vmload vgif umip pku ospke vaes
vpclmulqdq rdpid overflow_recov succor smca
- $ sudo ./rdpru
- BUILD_HEAD=16647354
- timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot
-nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4
-vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel
/tmp/tmp.syc17ecDpN -smp 1 -cpu max # -initrd /tmp/tmp.poLG53JqrJ
+ $ sudo ./rdpru
+ BUILD_HEAD=d6421940
+ timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot
-nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4
-vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel
/tmp/tmp.XOMVxpyNnl -smp 1 -cpu max # -initrd /tmp/tmp.I2TbGXFiaZ
enabling apic
+ smp: waiting for 0 APs
PASS: RDPRU raises #UD
SUMMARY: 1 tests
PASS rdpru (1 tests)
[Where problems could occur]
- This patchset will add a new feature bit RDPRU, the impact should be small as
it's still up to user-space for making use of it.
+ This patchset will add a new feature bit RDPRU for this specific processor,
it's still up to user-space for making use of it. But we can expect to see new
issues coming up when utilizing this bit in the future.
[Original Bug Report]
Issue found on B-ibm-gt-4.15.0-1116.127
This can be reproduced with B-4.15.0-175 as well.
This failure is only visible on this node.
Running
'/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/rdpru'
BUILD_HEAD=16647354
timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot
-nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4
-vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel
/tmp/tmp.qGIR5tvTw1 -smp 1 -cpu max # -initrd /tmp/tmp.8JuYRCFRUi
enabling apic
FAIL: RDPRU raises #UD
SUMMARY: 1 tests, 1 unexpected failures
FAIL rdpru (1 tests, 1 unexpected failures)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Po-Hsu Lin (cypressyew)
** Changed in: ubuntu-kernel-tests
Assignee: (unassigned) => Po-Hsu Lin (cypressyew)
** Changed in: ubuntu-kernel-tests
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1968681
Title:
rdpru in ubuntu_kvm_unit_tests failed on B-4.15 node riccioli with
FAIL: RDPRU raises #UD
Status in ubuntu-kernel-tests:
In Progress
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
In Progress
Bug description:
[Impact]
rdpru test in ubuntu_kvm_unit_tests is to check if the RDPRU instruction can
be intercepted by the Hypervisor.
RDPRU is one of the new instruction set extensions of AMD "Zen 2" CPUs
that is for reading a processor register that is typically limited to
privilege level zero. RDPRU allows for reading select registers at any
privilege level. With Linux 5.5, the RDPRU presence will be advertised
by the CPU features.
Without this patchset, the rdpru test will fail on our AMD Zen 2
system "riccioli"
[Fix]
* fb64f293 x86/cpufeatures: Add feature bit RDPRU on AMD
* 0cb8410b kvm: svm: Intercept RDPRU
We have these patches in newer releases already, only Bionic 4.15
require this fix. And it can be cherry-picked without any conflict.
[Test]
With the patched kernel, this rdpru test will pass on the target AMD Zen 2
system.
And the rdpru flag will be available in cpuinfo:
$ grep rdpru /proc/cpuinfo
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb
rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid extd_apicid
aperfmperf pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe
popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core
perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 invpcid_single hw_pstate
ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm
rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves
cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr
rdpru arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid
decodeassists pausefilter pfthreshold v_vmsave_vmload vgif umip pku ospke vaes
vpclmulqdq rdpid overflow_recov succor smca
$ sudo ./rdpru
BUILD_HEAD=d6421940
timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot
-nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4
-vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel
/tmp/tmp.XOMVxpyNnl -smp 1 -cpu max # -initrd /tmp/tmp.I2TbGXFiaZ
enabling apic
smp: waiting for 0 APs
PASS: RDPRU raises #UD
SUMMARY: 1 tests
PASS rdpru (1 tests)
[Where problems could occur]
This patchset will add a new feature bit RDPRU for this specific processor,
it's still up to user-space for making use of it. But we can expect to see new
issues coming up when utilizing this bit in the future.
[Original Bug Report]
Issue found on B-ibm-gt-4.15.0-1116.127
This can be reproduced with B-4.15.0-175 as well.
This failure is only visible on this node.
Running
'/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/rdpru'
BUILD_HEAD=16647354
timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot
-nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4
-vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel
/tmp/tmp.qGIR5tvTw1 -smp 1 -cpu max # -initrd /tmp/tmp.8JuYRCFRUi
enabling apic
FAIL: RDPRU raises #UD
SUMMARY: 1 tests, 1 unexpected failures
FAIL rdpru (1 tests, 1 unexpected failures)
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