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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-12 20:28:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-12 20:28:00 -0700 |
| commit | dbee3d02458b129b847c21f5fa60baba3eafc6f7 (patch) | |
| tree | 5aaac9919c7544daba61b3180a8f5fd309b37fd2 /arch | |
| parent | b08fc5277aaa1d8ea15470d38bf36f19dfb0e125 (diff) | |
| download | linux-dbee3d02458b129b847c21f5fa60baba3eafc6f7.tar.bz2 | |
KVM: x86: VMX: fix build without hyper-v
Commit ceef7d10dfb6 ("KVM: x86: VMX: hyper-v: Enlightened MSR-Bitmap
support") broke the build with Hyper-V disabled, because it accesses
ms_hyperv.nested_features without checking if that exists.
This is the quick-and-hacky build fix.
I suspect the proper fix is to replace the
static_branch_unlikely(&enable_evmcs)
tests with an inline helper function that also checks that CONFIG_HYPERV
is enabled, since without that, enable_evmcs makes no sense.
But I want a working build environment first and foremost, and I'm upset
this slipped through in the first place. My primary build tests missed
it because I tend to build with everything enabled, but it should have
been caught in the kvm tree.
Fixes: ceef7d10dfb6 ("KVM: x86: VMX: hyper-v: Enlightened MSR-Bitmap support")
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index fc61e25966e4..d0dd35d582da 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4429,6 +4429,7 @@ static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) goto out_vmcs; memset(loaded_vmcs->msr_bitmap, 0xff, PAGE_SIZE); +#if IS_ENABLED(CONFIG_HYPERV) if (static_branch_unlikely(&enable_evmcs) && (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)) { struct hv_enlightened_vmcs *evmcs = @@ -4436,6 +4437,8 @@ static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) evmcs->hv_enlightenments_control.msr_bitmap = 1; } +#endif + } return 0; |