x86/KVM/VMX: Expose SPEC_CTRL Bit(2) to the guest

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commit da39556f66 upstream

Expose the CPUID.7.EDX[31] bit to the guest, and also guard against various
combinations of SPEC_CTRL MSR values.

The handling of the MSR (to take into account the host value of SPEC_CTRL
Bit(2)) is taken care of in patch:

  KVM/SVM/VMX/x86/spectre_v2: Support the combination of guest and host IBRS

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Konrad Rzeszutek Wilk 2018-04-25 22:04:25 -04:00 • committed by Greg Kroah-Hartman

parent 716bfae3b3

commit 97224b3da6

2 changed files with 6 additions and 4 deletions

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2

arch/x86/kvm/cpuid.c

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8

arch/x86/kvm/vmx.c

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