KVM: nVMX: generate MSR_IA32_CR{0,4}_FIXED1 from guest CPUID

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MSR_IA32_CR{0,4}_FIXED1 define which bits in CR0 and CR4 are allowed to
be 1 during VMX operation. Since the set of allowed-1 bits is the same
in and out of VMX operation, we can generate these MSRs entirely from
the guest's CPUID. This lets userspace avoiding having to save/restore
these MSRs.

This patch also initializes MSR_IA32_CR{0,4}_FIXED1 from the CPU's MSRs
by default. This is a saner than the current default of -1ull, which
includes bits that the host CPU does not support.

Signed-off-by: David Matlack <dmatlack@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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David Matlack 2016-11-29 18:14:09 -08:00 • committed by Paolo Bonzini

parent 3899152ccb

commit 8322ebbb24

1 changed files with 52 additions and 3 deletions

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arch/x86/kvm/vmx.c

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