KVM: VMX: make MSR bitmaps per-VCPU

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Place the MSR bitmap in struct loaded_vmcs, and update it in place
every time the x2apic or APICv state can change.  This is rare and
the loop can handle 64 MSRs per iteration, in a similar fashion as
nested_vmx_prepare_msr_bitmap.

This prepares for choosing, on a per-VM basis, whether to intercept
the SPEC_CTRL and PRED_CMD MSRs.

Cc: stable@vger.kernel.org       # prereq for Spectre mitigation
Suggested-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Paolo Bonzini 2018-01-16 16:51:18 +01:00

parent f21f165ef9

commit 904e14fb7c

1 changed files with 147 additions and 123 deletions

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arch/x86/kvm/vmx.c

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