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Date: Fri, 18 Oct 2019 10:09:05 -0700
From: Sean Christopherson <sean.j.christopherson@...el.com>
To: Xiaoyao Li <xiaoyao.li@...el.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] KVM: VMX: Rename {vmx,nested_vmx}_vcpu_setup()
and minor cleanup
On Fri, Oct 18, 2019 at 05:37:22PM +0800, Xiaoyao Li wrote:
> Rename {vmx,nested_vmx}_vcpu_setup() to {vmx,nested_vmx}_vmcs_setup,
> to match what they really do.
>
> Aslo remove the vmcs unrelated codes to vmx_vcpu_create().
Do this in a separate patch, just in case there is a dependencies we're
missing.
> The initialization of vmx->hv_deadline_tsc can be removed here, because
> it will be called in vmx_vcpu_reset() as the flow:
>
> kvm_arch_vcpu_setup()
> -> kvm_vcpu_reset()
> -> vmx_vcpu_reset()
Definitely needs to be in a separate patch.
>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
> ---
> Changes in v2:
> - move out the vmcs unrelated codes
> ---
> arch/x86/kvm/vmx/nested.c | 2 +-
> arch/x86/kvm/vmx/nested.h | 2 +-
> arch/x86/kvm/vmx/vmx.c | 45 +++++++++++++++++----------------------
> 3 files changed, 22 insertions(+), 27 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 5e231da00310..7935422d311f 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -5768,7 +5768,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
> return ret;
> }
>
> -void nested_vmx_vcpu_setup(void)
> +void nested_vmx_vmcs_setup(void)
"vmcs_setup" sounds like we're allocating and loading a VMCS. Maybe
{nested_,}vmx_set_initial_vmcs_state() a la vmx_set_constant_host_state()?
> {
> if (enable_shadow_vmcs) {
> vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap));
> diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h
> index 187d39bf0bf1..2be1ba7482c9 100644
> --- a/arch/x86/kvm/vmx/nested.h
> +++ b/arch/x86/kvm/vmx/nested.h
> @@ -11,7 +11,7 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps,
> bool apicv);
> void nested_vmx_hardware_unsetup(void);
> __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *));
> -void nested_vmx_vcpu_setup(void);
> +void nested_vmx_vmcs_setup(void);
> void nested_vmx_free_vcpu(struct kvm_vcpu *vcpu);
> int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, bool from_vmentry);
> bool nested_vmx_exit_reflected(struct kvm_vcpu *vcpu, u32 exit_reason);
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index ef567df344bf..b083316a598d 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -4161,15 +4161,10 @@ static void ept_set_mmio_spte_mask(void)
>
> #define VMX_XSS_EXIT_BITMAP 0
>
> -/*
> - * Sets up the vmcs for emulated real mode.
> - */
> -static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
> +static void vmx_vmcs_setup(struct vcpu_vmx *vmx)
> {
> - int i;
> -
> if (nested)
> - nested_vmx_vcpu_setup();
> + nested_vmx_vmcs_setup();
>
> if (cpu_has_vmx_msr_bitmap())
> vmcs_write64(MSR_BITMAP, __pa(vmx->vmcs01.msr_bitmap));
> @@ -4178,7 +4173,6 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
>
> /* Control */
> pin_controls_set(vmx, vmx_pin_based_exec_ctrl(vmx));
> - vmx->hv_deadline_tsc = -1;
>
> exec_controls_set(vmx, vmx_exec_control(vmx));
>
> @@ -4227,21 +4221,6 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
> if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
> vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat);
>
> - for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) {
> - u32 index = vmx_msr_index[i];
> - u32 data_low, data_high;
> - int j = vmx->nmsrs;
> -
> - if (rdmsr_safe(index, &data_low, &data_high) < 0)
> - continue;
> - if (wrmsr_safe(index, data_low, data_high) < 0)
> - continue;
> - vmx->guest_msrs[j].index = i;
> - vmx->guest_msrs[j].data = 0;
> - vmx->guest_msrs[j].mask = -1ull;
> - ++vmx->nmsrs;
> - }
> -
> vm_exit_controls_set(vmx, vmx_vmexit_ctrl());
>
> /* 22.2.1, 20.8.1 */
> @@ -6710,7 +6689,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
> int err;
> struct vcpu_vmx *vmx;
> unsigned long *msr_bitmap;
> - int cpu;
> + int i, cpu;
>
> BUILD_BUG_ON_MSG(offsetof(struct vcpu_vmx, vcpu) != 0,
> "struct kvm_vcpu must be at offset 0 for arch usercopy region");
> @@ -6786,9 +6765,25 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
> cpu = get_cpu();
> vmx_vcpu_load(&vmx->vcpu, cpu);
> vmx->vcpu.cpu = cpu;
> - vmx_vcpu_setup(vmx);
> + vmx_vmcs_setup(vmx);
> vmx_vcpu_put(&vmx->vcpu);
> put_cpu();
> +
> + for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) {
> + u32 index = vmx_msr_index[i];
> + u32 data_low, data_high;
> + int j = vmx->nmsrs;
> +
> + if (rdmsr_safe(index, &data_low, &data_high) < 0)
> + continue;
> + if (wrmsr_safe(index, data_low, data_high) < 0)
> + continue;
> + vmx->guest_msrs[j].index = i;
> + vmx->guest_msrs[j].data = 0;
> + vmx->guest_msrs[j].mask = -1ull;
> + ++vmx->nmsrs;
> + }
I'd put this immediately after guest_msrs is allocated. Yeah, we'll waste
a few cycles if allocating vmcs01 fails, but that should be a very rare
event.
> +
> if (cpu_need_virtualize_apic_accesses(&vmx->vcpu)) {
> err = alloc_apic_access_page(kvm);
> if (err)
> --
> 2.19.1
>
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