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| author |   Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-08-30 15:37:34 +0200 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-09-26 12:02:59 -0400 |
| commit | 66a329be4b0abc81ee3d9a7e4f77f5f33f435362 (patch) | |
| tree | 262749eb0b4908e3b410aa93211513fb7ffbb44c /drivers/net/netdevsim/git:/ssh:/git@git.zx2c4.com | |
| parent | KVM: VMX: Move LOAD_IA32_PERF_GLOBAL_CTRL errata handling out of setup_vmcs_config() (diff) | |
| download | linux-dev-66a329be4b0abc81ee3d9a7e4f77f5f33f435362.tar.xz linux-dev-66a329be4b0abc81ee3d9a7e4f77f5f33f435362.zip | |
KVM: nVMX: Always set required-1 bits of pinbased_ctls to PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR
Similar to exit_ctls_low, entry_ctls_low, and procbased_ctls_low,
pinbased_ctls_low should be set to PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR
and not host's MSR_IA32_VMX_PINBASED_CTLS value |=
PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR.
The commit eabeaaccfca0 ("KVM: nVMX: Clean up and fix pin-based
execution controls") which introduced '|=' doesn't mention anything
about why this is needed, the change seems rather accidental.
Note: normally, required-1 portion of MSR_IA32_VMX_PINBASED_CTLS should
be equal to PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR so no behavioral change
is expected, however, it is (in theory) possible to observe something
different there when e.g. KVM is running as a nested hypervisor. Hope
this doesn't happen in practice.
Reported-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220830133737.1539624-31-vkuznets@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'drivers/net/netdevsim/git:/ssh:/git@git.zx2c4.com')
0 files changed, 0 insertions, 0 deletions