diff options
| author | Alexander Graf <graf@amazon.com> | 2020-09-25 16:34:20 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-09-28 13:58:07 +0200 |
| commit | 3eb900173c71392087f4b0ada66f67ceae7e75f0 (patch) | |
| tree | 82313f364ad1795ad48146753ad7b26413085aec /arch/x86/kvm/vmx/vmx.h | |
| parent | KVM: x86: SVM: Prevent MSR passthrough when MSR access is denied (diff) | |
| download | linux-3eb900173c71392087f4b0ada66f67ceae7e75f0.tar.xz linux-3eb900173c71392087f4b0ada66f67ceae7e75f0.zip | |
KVM: x86: VMX: Prevent MSR passthrough when MSR access is denied
We will introduce the concept of MSRs that may not be handled in kernel
space soon. Some MSRs are directly passed through to the guest, effectively
making them handled by KVM from user space's point of view.
This patch introduces all logic required to ensure that MSRs that
user space wants trapped are not marked as direct access for guests.
Signed-off-by: Alexander Graf <graf@amazon.com>
Message-Id: <20200925143422.21718-7-graf@amazon.com>
[Replace "_idx" with "_slot". - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.h')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 64fe6c91435f..5961cb897125 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -279,6 +279,13 @@ struct vcpu_vmx { u64 ept_pointer; struct pt_desc pt_desc; + + /* Save desired MSR intercept (read: pass-through) state */ +#define MAX_POSSIBLE_PASSTHROUGH_MSRS 13 + struct { + DECLARE_BITMAP(read, MAX_POSSIBLE_PASSTHROUGH_MSRS); + DECLARE_BITMAP(write, MAX_POSSIBLE_PASSTHROUGH_MSRS); + } shadow_msr_intercept; }; enum ept_pointers_status { |