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| author | David Matlack <dmatlack@google.com> | 2016-11-29 18:14:09 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-12-08 15:31:08 +0100 |
| commit | 8322ebbb24088c22049ef53cd066c6c220640edb (patch) | |
| tree | d91152a0df6fc1700e5f6c296f0f553b6572e439 /scripts/gcc-plugins/gcc-generate-rtl-pass.h | |
| parent | 3899152ccbf42d7e3d3c7830b1fae75a575a1ed6 (diff) | |
KVM: nVMX: generate MSR_IA32_CR{0,4}_FIXED1 from guest CPUID
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>
Diffstat (limited to 'scripts/gcc-plugins/gcc-generate-rtl-pass.h')
0 files changed, 0 insertions, 0 deletions