On Wed, Jul 08, 2020 at 03:44:09PM +0800, Like Xu wrote: > in guest protected mode, if the current privilege level > is not 0 and the pce flag in the cr4 register is cleared, > we will inject a #gp for rdpmc usage.
Wrapping at ~58 characters is a bit aggressive. checkpatch enforces 75 chars, something near that would be prefereable. > Signed-off-by: Like Xu <[email protected]> > --- > arch/x86/kvm/pmu.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c > index b86346903f2e..d080d475c808 100644 > --- a/arch/x86/kvm/pmu.c > +++ b/arch/x86/kvm/pmu.c > @@ -372,6 +372,11 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, > u64 *data) > if (!pmc) > return 1; > > + if ((kvm_x86_ops.get_cpl(vcpu) != 0) && > + !(kvm_read_cr4(vcpu) & X86_CR4_PCE) && > + (kvm_read_cr4(vcpu) & X86_CR0_PE)) This reads CR4 but checks CR0.PE. And maybe put the X86_CR4_PCE check first so that it's the focus of the statement? > + return 1; > + > *data = pmc_read_counter(pmc) & mask; > return 0; > } > -- > 2.21.3 >
