lkml.org 
[lkml]   [2023]   [Jan]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v10 098/108] KVM: TDX: Implement callbacks for MSR operations for TDX
From

I believe we should also have a handler for .msr_filter_changed.

Without an .msr_filter_changed handler, a host crash can occur if we
first set up a vcpu for the TD, and then set an MSR filter.

If we first set up a vcpu for the TD, and then set an MSR filter, upon
vcpu_enter_guest, the .msr_filter_changed handler (currently
vmx_msr_filter_changed()) will be invoked. to_vmx(vcpu) interprets the
containing struct of struct kvm_vcpu to be a struct vcpu_vmx instead of
a struct vcpu_tdx.

In my case, I was working on a selftest and the missing handler caused a
NULL dereference in vmx_disable_intercept_for_msr() because
vmx->vmcs01.msr_bitmap is NULL.

\
 
 \ /
  Last update: 2023-03-26 23:27    [W:1.641 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site