]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
KVM: x86: Fix the intel_pt PMI handling wrongly considered from guest
authorYanfei Xu <yanfei.xu@intel.com>
Mon, 23 May 2022 14:08:21 +0000 (22:08 +0800)
committerPaolo Bonzini <pbonzini@redhat.com>
Wed, 25 May 2022 09:18:27 +0000 (05:18 -0400)
commitffd1925a596ce68bed7d81c61cb64bc35f788a9d
treebd58ed1a829eec226ffcb569e943fe448e453086
parent366d4a12cdcf3d83c8162ff6e0046c123567c754
KVM: x86: Fix the intel_pt PMI handling wrongly considered from guest

When kernel handles the vm-exit caused by external interrupts and NMI,
it always sets kvm_intr_type to tell if it's dealing an IRQ or NMI. For
the PMI scenario, it could be IRQ or NMI.

However, intel_pt PMIs are only generated for HARDWARE perf events, and
HARDWARE events are always configured to generate NMIs.  Use
kvm_handling_nmi_from_guest() to precisely identify if the intel_pt PMI
came from the guest; this avoids false positives if an intel_pt PMI/NMI
arrives while the host is handling an unrelated IRQ VM-Exit.

Fixes: db215756ae59 ("KVM: x86: More precisely identify NMI from guest when handling PMI")
Signed-off-by: Yanfei Xu <yanfei.xu@intel.com>
Message-Id: <20220523140821.1345605-1-yanfei.xu@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/vmx/vmx.c