Rework the MSR filtering implementation to treat a given filter instance as an atomic unit, and to properly protect it with SRCU. Fix two nVMX bugs related to MSR filtering (one directly, one indirectly), and additional cleanup on top. Regarding the macro insanity in patch 03, I verified the before and after binary output for vmx_set_intercept_for_msr() was identical, again. This required wrapping "if (msr <= 0x1fff)" with (un)likely in both the before and after versions; gcc made seemingly random choices without forcing it to favor a specific branch. v2: - Collect R-b. [Paolo, Alex]. - Make the macro insanity slightly less insane. [Paolo] v1: https://lkml.kernel.org/r/20210316184436.2544875-1-seanjc@xxxxxxxxxx Sean Christopherson (4): KVM: x86: Protect userspace MSR filter with SRCU, and set atomically-ish KVM: nVMX: Handle dynamic MSR intercept toggling KVM: VMX: Macrofy the MSR bitmap getters and setters KVM: nVMX: Clean up x2APIC MSR handling for L2 Documentation/virt/kvm/api.rst | 6 +- arch/x86/include/asm/kvm_host.h | 17 ++-- arch/x86/kvm/vmx/nested.c | 161 +++++++++++++------------------- arch/x86/kvm/vmx/vmx.c | 67 +------------ arch/x86/kvm/vmx/vmx.h | 28 ++++++ arch/x86/kvm/x86.c | 109 ++++++++++++--------- 6 files changed, 172 insertions(+), 216 deletions(-) -- 2.31.0.rc2.261.g7f71774620-goog
