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    SubjectRe: [PATCH 08/14] KVM: x86/mmu: Make dirty log size hook (PML) a value, not a function
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    On 13/02/21 01:50, Sean Christopherson wrote:
    > Store the vendor-specific dirty log size in a variable, there's no need
    > to wrap it in a function since the value is constant after
    > hardware_setup() runs.

    For now... :)

    Paolo

    > Signed-off-by: Sean Christopherson <seanjc@google.com>
    > ---
    > arch/x86/include/asm/kvm-x86-ops.h | 1 -
    > arch/x86/include/asm/kvm_host.h | 2 +-
    > arch/x86/kvm/mmu/mmu.c | 5 +----
    > arch/x86/kvm/vmx/vmx.c | 9 ++-------
    > 4 files changed, 4 insertions(+), 13 deletions(-)
    >
    > diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
    > index 355a2ab8fc09..28c07cc01474 100644
    > --- a/arch/x86/include/asm/kvm-x86-ops.h
    > +++ b/arch/x86/include/asm/kvm-x86-ops.h
    > @@ -97,7 +97,6 @@ KVM_X86_OP_NULL(slot_enable_log_dirty)
    > KVM_X86_OP_NULL(slot_disable_log_dirty)
    > KVM_X86_OP_NULL(flush_log_dirty)
    > KVM_X86_OP_NULL(enable_log_dirty_pt_masked)
    > -KVM_X86_OP_NULL(cpu_dirty_log_size)
    > KVM_X86_OP_NULL(pre_block)
    > KVM_X86_OP_NULL(post_block)
    > KVM_X86_OP_NULL(vcpu_blocking)
    > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    > index 84499aad01a4..fb59933610d9 100644
    > --- a/arch/x86/include/asm/kvm_host.h
    > +++ b/arch/x86/include/asm/kvm_host.h
    > @@ -1294,7 +1294,7 @@ struct kvm_x86_ops {
    > void (*enable_log_dirty_pt_masked)(struct kvm *kvm,
    > struct kvm_memory_slot *slot,
    > gfn_t offset, unsigned long mask);
    > - int (*cpu_dirty_log_size)(void);
    > + int cpu_dirty_log_size;
    >
    > /* pmu operations of sub-arch */
    > const struct kvm_pmu_ops *pmu_ops;
    > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
    > index d5849a0e3de1..6c32e8e0f720 100644
    > --- a/arch/x86/kvm/mmu/mmu.c
    > +++ b/arch/x86/kvm/mmu/mmu.c
    > @@ -1294,10 +1294,7 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
    >
    > int kvm_cpu_dirty_log_size(void)
    > {
    > - if (kvm_x86_ops.cpu_dirty_log_size)
    > - return static_call(kvm_x86_cpu_dirty_log_size)();
    > -
    > - return 0;
    > + return kvm_x86_ops.cpu_dirty_log_size;
    > }
    >
    > bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
    > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
    > index b47ed3f412ef..f843707dd7df 100644
    > --- a/arch/x86/kvm/vmx/vmx.c
    > +++ b/arch/x86/kvm/vmx/vmx.c
    > @@ -7650,11 +7650,6 @@ static bool vmx_check_apicv_inhibit_reasons(ulong bit)
    > return supported & BIT(bit);
    > }
    >
    > -static int vmx_cpu_dirty_log_size(void)
    > -{
    > - return enable_pml ? PML_ENTITY_NUM : 0;
    > -}
    > -
    > static struct kvm_x86_ops vmx_x86_ops __initdata = {
    > .hardware_unsetup = hardware_unsetup,
    >
    > @@ -7758,6 +7753,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
    > .slot_disable_log_dirty = vmx_slot_disable_log_dirty,
    > .flush_log_dirty = vmx_flush_log_dirty,
    > .enable_log_dirty_pt_masked = vmx_enable_log_dirty_pt_masked,
    > + .cpu_dirty_log_size = PML_ENTITY_NUM,
    >
    > .pre_block = vmx_pre_block,
    > .post_block = vmx_post_block,
    > @@ -7785,7 +7781,6 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
    >
    > .msr_filter_changed = vmx_msr_filter_changed,
    > .complete_emulated_msr = kvm_complete_insn_gp,
    > - .cpu_dirty_log_size = vmx_cpu_dirty_log_size,
    >
    > .vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector,
    > };
    > @@ -7907,7 +7902,7 @@ static __init int hardware_setup(void)
    > vmx_x86_ops.slot_disable_log_dirty = NULL;
    > vmx_x86_ops.flush_log_dirty = NULL;
    > vmx_x86_ops.enable_log_dirty_pt_masked = NULL;
    > - vmx_x86_ops.cpu_dirty_log_size = NULL;
    > + vmx_x86_ops.cpu_dirty_log_size = 0;
    > }
    >
    > if (!cpu_has_vmx_preemption_timer())
    >

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