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| author | Mohammed Gamal <mgamal@redhat.com> | 2020-09-03 17:11:22 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-09-23 16:47:24 +0300 |
| commit | b96e6506c2ea7c8e3ef0860169b6d0ba2f1aca9f (patch) | |
| tree | 6927cdc044f7b7ae2ff622019e367181bc9ee760 /arch/x86/kvm/vmx/vmx.h | |
| parent | 32251b07d532174d66941488c112ec046f646157 (diff) | |
| download | linux-b96e6506c2ea7c8e3ef0860169b6d0ba2f1aca9f.tar.xz | |
KVM: x86: VMX: Make smaller physical guest address space support user-configurable
This patch exposes allow_smaller_maxphyaddr to the user as a module parameter.
Since smaller physical address spaces are only supported on VMX, the
parameter is only exposed in the kvm_intel module.
For now disable support by default, and let the user decide if they want
to enable it.
Modifications to VMX page fault and EPT violation handling will depend
on whether that parameter is enabled.
Signed-off-by: Mohammed Gamal <mgamal@redhat.com>
Message-Id: <20200903141122.72908-1-mgamal@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.h')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index a2f82127c170..a0e47720f60c 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -552,7 +552,10 @@ static inline bool vmx_has_waitpkg(struct vcpu_vmx *vmx) static inline bool vmx_need_pf_intercept(struct kvm_vcpu *vcpu) { - return !enable_ept || cpuid_maxphyaddr(vcpu) < boot_cpu_data.x86_phys_bits; + if (!enable_ept) + return true; + + return allow_smaller_maxphyaddr && cpuid_maxphyaddr(vcpu) < boot_cpu_data.x86_phys_bits; } void dump_vmcs(void); |