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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-07 02:18:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-07 02:18:14 +0000
commit3a4516e9d4e52a1e1c49f9c269b6e702ef586047 (patch)
tree0e12fabd3a7d77e4d0bb956b670df8a1062abf7e /arch/x86/kvm/vmx
parentReleasing progress-linux version 6.1.85-1progress7u1. (diff)
downloadlinux-3a4516e9d4e52a1e1c49f9c269b6e702ef586047.tar.xz
linux-3a4516e9d4e52a1e1c49f9c269b6e702ef586047.zip
Merging upstream version 6.1.90.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/kvm/vmx')
-rw-r--r--arch/x86/kvm/vmx/vmx.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 5c1590855..10aff2c9a 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7742,8 +7742,28 @@ static u64 vmx_get_perf_capabilities(void)
if (vmx_pebs_supported()) {
perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK;
- if ((perf_cap & PERF_CAP_PEBS_FORMAT) < 4)
- perf_cap &= ~PERF_CAP_PEBS_BASELINE;
+
+ /*
+ * Disallow adaptive PEBS as it is functionally broken, can be
+ * used by the guest to read *host* LBRs, and can be used to
+ * bypass userspace event filters. To correctly and safely
+ * support adaptive PEBS, KVM needs to:
+ *
+ * 1. Account for the ADAPTIVE flag when (re)programming fixed
+ * counters.
+ *
+ * 2. Gain support from perf (or take direct control of counter
+ * programming) to support events without adaptive PEBS
+ * enabled for the hardware counter.
+ *
+ * 3. Ensure LBR MSRs cannot hold host data on VM-Entry with
+ * adaptive PEBS enabled and MSR_PEBS_DATA_CFG.LBRS=1.
+ *
+ * 4. Document which PMU events are effectively exposed to the
+ * guest via adaptive PEBS, and make adaptive PEBS mutually
+ * exclusive with KVM_SET_PMU_EVENT_FILTER if necessary.
+ */
+ perf_cap &= ~PERF_CAP_PEBS_BASELINE;
}
return perf_cap;