[PATCH 0/4 v4] nSVM: Test host RFLAGS.TF on VMRUN

From: Krish Sadhukhan <krish.sadhukhan@oracle.com>
To: kvm@vger.kernel.org
Cc: pbonzini@redhat.com, jmattson@google.com, seanjc@google.com
Subject: [PATCH 0/4 v4] nSVM: Test host RFLAGS.TF on VMRUN
Date: Mon, 22 Mar 2021 14:10:03 -0400	[thread overview]
Message-ID: <20210322181007.71519-1-krish.sadhukhan@oracle.com> (raw)

v3 -> v4:
        1. Patch# 1 fixes the problem differently from what v3 did. In the new
           fix, svm_vcpu_run() for L1 first checks if the previous #VMEXIT from
           L2 was a VMRUN #VMEXIT and if that VMRUN is being single-stepped. If
           both of these conditions are satisfied, it synthesizes a #DB 
           intercept to account for the pending RFLAGS.TF. This prevents the
           instruction next to VMRUN from being executed before taking care of
           the pending RFLAGS.TF.
        2. in Patch# 4, in host_rflags_test(), the call to vmmcall() has been
           moved down. 

[PATCH 1/4 v4] KVM: nSVM: Trigger synthetic #DB intercept following completion of single-stepped VMRUN instruction
[PATCH 2/4 v4] KVM: X86: Add a utility function to read current RIP
[PATCH 3/4 v4] nSVM: Add assembly label to VMRUN instruction
[PATCH 4/4 v4] nSVM: Test effect of host RFLAGS.TF on VMRUN

 arch/x86/kvm/svm/svm.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Krish Sadhukhan (1):
      KVM: Trigger synthetic #DB intercept following completion of single-stepped VMRUN instruction

 lib/x86/processor.h |   7 ++++
 x86/svm.c           |  16 ++++++--
 x86/svm_tests.c     | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 134 insertions(+), 4 deletions(-)

Krish Sadhukhan (3):
      KVM: X86: Add a utility function to read current RIP
      KVM: nSVM: Add assembly label to VMRUN instruction
      nSVM: Test effect of host RFLAGS.TF on VMRUN