Re: [v2,3/3] KVM: VMX: make MSR bitmaps per-VCPU

[Mihai Carabas]

Hello Paolo,

On 27.01.2018 10:50, Paolo Bonzini wrote:
> Place the MSR bitmap in struct loaded_vmcs, and update it in place
> every time the x2apic or APICv state can change.  This is rare and
> the loop can handle 64 MSRs per iteration, in a similar fashion as
> nested_vmx_prepare_msr_bitmap.

I've back-ported this patch set on 4.1 and made some successful tests.

Reviewed-by: Mihai Carabas <mihai.carabas@xxxxxxxxxx>

> This prepares for choosing, on a per-VM basis, whether to intercept
> the SPEC_CTRL and PRED_CMD MSRs.
>
> Suggested-by: Jim Mattson <jmattson@xxxxxxxxxx>
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Acked-by: David Hildenbrand <david@xxxxxxxxxx>
> ---
>   arch/x86/kvm/vmx.c | 267 +++++++++++++++++++++++++++++------------------------
>   1 file changed, 144 insertions(+), 123 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index ab4b9bc99a52..34551f293881 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -111,6 +111,14 @@
>   static bool __read_mostly enable_pml = 1;
>   module_param_named(pml, enable_pml, bool, S_IRUGO);
>   
> +#define MSR_TYPE_R	1
> +#define MSR_TYPE_W	2
> +#define MSR_TYPE_RW	3
> +
> +#define MSR_BITMAP_MODE_X2APIC		1
> +#define MSR_BITMAP_MODE_X2APIC_APICV	2
> +#define MSR_BITMAP_MODE_LM		4
> +
>   #define KVM_VMX_TSC_MULTIPLIER_MAX     0xffffffffffffffffULL
>   
>   /* Guest_tsc -> host_tsc conversion requires 64-bit division.  */
> @@ -209,6 +217,7 @@ struct loaded_vmcs {
>   	int soft_vnmi_blocked;
>   	ktime_t entry_time;
>   	s64 vnmi_blocked_time;
> +	unsigned long *msr_bitmap;
>   	struct list_head loaded_vmcss_on_cpu_link;
>   };
>   
> @@ -449,8 +458,6 @@ struct nested_vmx {
>   	bool pi_pending;
>   	u16 posted_intr_nv;
>   
> -	unsigned long *msr_bitmap;
> -
>   	struct hrtimer preemption_timer;
>   	bool preemption_timer_expired;
>   
> @@ -573,6 +580,7 @@ struct vcpu_vmx {
>   	struct kvm_vcpu       vcpu;
>   	unsigned long         host_rsp;
>   	u8                    fail;
> +	u8		      msr_bitmap_mode;
>   	u32                   exit_intr_info;
>   	u32                   idt_vectoring_info;
>   	ulong                 rflags;
> @@ -927,6 +935,7 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu,
>   static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked);
>   static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
>   					    u16 error_code);
> +static void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu);
>   
>   static DEFINE_PER_CPU(struct vmcs *, vmxarea);
>   static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
> @@ -946,12 +955,6 @@ static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
>   enum {
>   	VMX_IO_BITMAP_A,
>   	VMX_IO_BITMAP_B,
> -	VMX_MSR_BITMAP_LEGACY,
> -	VMX_MSR_BITMAP_LONGMODE,
> -	VMX_MSR_BITMAP_LEGACY_X2APIC_APICV,
> -	VMX_MSR_BITMAP_LONGMODE_X2APIC_APICV,
> -	VMX_MSR_BITMAP_LEGACY_X2APIC,
> -	VMX_MSR_BITMAP_LONGMODE_X2APIC,
>   	VMX_VMREAD_BITMAP,
>   	VMX_VMWRITE_BITMAP,
>   	VMX_BITMAP_NR
> @@ -961,12 +964,6 @@ enum {
>   
>   #define vmx_io_bitmap_a                      (vmx_bitmap[VMX_IO_BITMAP_A])
>   #define vmx_io_bitmap_b                      (vmx_bitmap[VMX_IO_BITMAP_B])
> -#define vmx_msr_bitmap_legacy                (vmx_bitmap[VMX_MSR_BITMAP_LEGACY])
> -#define vmx_msr_bitmap_longmode              (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE])
> -#define vmx_msr_bitmap_legacy_x2apic_apicv   (vmx_bitmap[VMX_MSR_BITMAP_LEGACY_X2APIC_APICV])
> -#define vmx_msr_bitmap_longmode_x2apic_apicv (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE_X2APIC_APICV])
> -#define vmx_msr_bitmap_legacy_x2apic         (vmx_bitmap[VMX_MSR_BITMAP_LEGACY_X2APIC])
> -#define vmx_msr_bitmap_longmode_x2apic       (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE_X2APIC])
>   #define vmx_vmread_bitmap                    (vmx_bitmap[VMX_VMREAD_BITMAP])
>   #define vmx_vmwrite_bitmap                   (vmx_bitmap[VMX_VMWRITE_BITMAP])
>   
> @@ -2564,36 +2561,6 @@ static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
>   	vmx->guest_msrs[from] = tmp;
>   }
>   
> -static void vmx_set_msr_bitmap(struct kvm_vcpu *vcpu)
> -{
> -	unsigned long *msr_bitmap;
> -
> -	if (is_guest_mode(vcpu))
> -		msr_bitmap = to_vmx(vcpu)->nested.msr_bitmap;
> -	else if (cpu_has_secondary_exec_ctrls() &&
> -		 (vmcs_read32(SECONDARY_VM_EXEC_CONTROL) &
> -		  SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE)) {
> -		if (enable_apicv && kvm_vcpu_apicv_active(vcpu)) {
> -			if (is_long_mode(vcpu))
> -				msr_bitmap = vmx_msr_bitmap_longmode_x2apic_apicv;
> -			else
> -				msr_bitmap = vmx_msr_bitmap_legacy_x2apic_apicv;
> -		} else {
> -			if (is_long_mode(vcpu))
> -				msr_bitmap = vmx_msr_bitmap_longmode_x2apic;
> -			else
> -				msr_bitmap = vmx_msr_bitmap_legacy_x2apic;
> -		}
> -	} else {
> -		if (is_long_mode(vcpu))
> -			msr_bitmap = vmx_msr_bitmap_longmode;
> -		else
> -			msr_bitmap = vmx_msr_bitmap_legacy;
> -	}
> -
> -	vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
> -}
> -
>   /*
>    * Set up the vmcs to automatically save and restore system
>    * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
> @@ -2634,7 +2601,7 @@ static void setup_msrs(struct vcpu_vmx *vmx)
>   	vmx->save_nmsrs = save_nmsrs;
>   
>   	if (cpu_has_vmx_msr_bitmap())
> -		vmx_set_msr_bitmap(&vmx->vcpu);
> +		vmx_update_msr_bitmap(&vmx->vcpu);
>   }
>   
>   /*
> @@ -3844,6 +3811,8 @@ static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
>   	loaded_vmcs_clear(loaded_vmcs);
>   	free_vmcs(loaded_vmcs->vmcs);
>   	loaded_vmcs->vmcs = NULL;
> +	if (loaded_vmcs->msr_bitmap)
> +		free_page((unsigned long)loaded_vmcs->msr_bitmap);
>   	WARN_ON(loaded_vmcs->shadow_vmcs != NULL);
>   }
>   
> @@ -3860,7 +3829,18 @@ static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
>   
>   	loaded_vmcs->shadow_vmcs = NULL;
>   	loaded_vmcs_init(loaded_vmcs);
> +
> +	if (cpu_has_vmx_msr_bitmap()) {
> +		loaded_vmcs->msr_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL);
> +		if (!loaded_vmcs->msr_bitmap)
> +			goto out_vmcs;
> +		memset(loaded_vmcs->msr_bitmap, 0xff, PAGE_SIZE);
> +	}
>   	return 0;
> +
> +out_vmcs:
> +	free_loaded_vmcs(loaded_vmcs);
> +	return -ENOMEM;
>   }
>   
>   static void free_kvm_area(void)
> @@ -4921,10 +4901,8 @@ static void free_vpid(int vpid)
>   	spin_unlock(&vmx_vpid_lock);
>   }
>   
> -#define MSR_TYPE_R	1
> -#define MSR_TYPE_W	2
> -static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
> -						u32 msr, int type)
> +static void __always_inline vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
> +							  u32 msr, int type)
>   {
>   	int f = sizeof(unsigned long);
>   
> @@ -4958,6 +4936,50 @@ static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
>   	}
>   }
>   
> +static void __always_inline vmx_enable_intercept_for_msr(unsigned long *msr_bitmap,
> +							 u32 msr, int type)
> +{
> +	int f = sizeof(unsigned long);
> +
> +	if (!cpu_has_vmx_msr_bitmap())
> +		return;
> +
> +	/*
> +	 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
> +	 * have the write-low and read-high bitmap offsets the wrong way round.
> +	 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
> +	 */
> +	if (msr <= 0x1fff) {
> +		if (type & MSR_TYPE_R)
> +			/* read-low */
> +			__set_bit(msr, msr_bitmap + 0x000 / f);
> +
> +		if (type & MSR_TYPE_W)
> +			/* write-low */
> +			__set_bit(msr, msr_bitmap + 0x800 / f);
> +
> +	} else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
> +		msr &= 0x1fff;
> +		if (type & MSR_TYPE_R)
> +			/* read-high */
> +			__set_bit(msr, msr_bitmap + 0x400 / f);
> +
> +		if (type & MSR_TYPE_W)
> +			/* write-high */
> +			__set_bit(msr, msr_bitmap + 0xc00 / f);
> +
> +	}
> +}
> +
> +static void __always_inline vmx_set_intercept_for_msr(unsigned long *msr_bitmap,
> +			     			      u32 msr, int type, bool value)
> +{
> +	if (value)
> +		vmx_enable_intercept_for_msr(msr_bitmap, msr, type);
> +	else
> +		vmx_disable_intercept_for_msr(msr_bitmap, msr, type);
> +}
> +
>   /*
>    * If a msr is allowed by L0, we should check whether it is allowed by L1.
>    * The corresponding bit will be cleared unless both of L0 and L1 allow it.
> @@ -5004,28 +5026,68 @@ static void nested_vmx_disable_intercept_for_msr(unsigned long *msr_bitmap_l1,
>   	}
>   }
>   
> -static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
> +static u8 vmx_msr_bitmap_mode(struct kvm_vcpu *vcpu)
>   {
> -	if (!longmode_only)
> -		__vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy,
> -						msr, MSR_TYPE_R | MSR_TYPE_W);
> -	__vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode,
> -						msr, MSR_TYPE_R | MSR_TYPE_W);
> +	u8 mode = 0;
> +
> +	if (cpu_has_secondary_exec_ctrls() &&
> +	    (vmcs_read32(SECONDARY_VM_EXEC_CONTROL) &
> +	     SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE)) {
> +		mode |= MSR_BITMAP_MODE_X2APIC;
> +		if (enable_apicv && kvm_vcpu_apicv_active(vcpu))
> +			mode |= MSR_BITMAP_MODE_X2APIC_APICV;
> +	}
> +
> +	if (is_long_mode(vcpu))
> +		mode |= MSR_BITMAP_MODE_LM;
> +
> +	return mode;
>   }
>   
> -static void vmx_disable_intercept_msr_x2apic(u32 msr, int type, bool apicv_active)
> +#define X2APIC_MSR(r) (APIC_BASE_MSR + ((r) >> 4))
> +
> +static void vmx_update_msr_bitmap_x2apic(unsigned long *msr_bitmap,
> +					 u8 mode)
>   {
> -	if (apicv_active) {
> -		__vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic_apicv,
> -				msr, type);
> -		__vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic_apicv,
> -				msr, type);
> -	} else {
> -		__vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic,
> -				msr, type);
> -		__vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic,
> -				msr, type);
> +	int msr;
> +
> +	for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) {
> +		unsigned word = msr / BITS_PER_LONG;
> +		msr_bitmap[word] = (mode & MSR_BITMAP_MODE_X2APIC_APICV) ? 0 : ~0;
> +		msr_bitmap[word + (0x800 / sizeof(long))] = ~0;
>   	}
> +
> +	if (mode & MSR_BITMAP_MODE_X2APIC) {
> +		/*
> +		 * TPR reads and writes can be virtualized even if virtual interrupt
> +		 * delivery is not in use.
> +		 */
> +		vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TASKPRI), MSR_TYPE_RW);
> +		if (mode & MSR_BITMAP_MODE_X2APIC_APICV) {
> +			vmx_enable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TMCCT), MSR_TYPE_R);
> +			vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_EOI), MSR_TYPE_W);
> +			vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_SELF_IPI), MSR_TYPE_W);
> +		}
> +	}
> +}
> +
> +static void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu)
> +{
> +	struct vcpu_vmx *vmx = to_vmx(vcpu);
> +	unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap;
> +	u8 mode = vmx_msr_bitmap_mode(vcpu);
> +	u8 changed = mode ^ vmx->msr_bitmap_mode;
> +
> +	if (!changed)
> +		return;
> +
> +	vmx_set_intercept_for_msr(msr_bitmap, MSR_KERNEL_GS_BASE, MSR_TYPE_RW,
> +				  !(mode & MSR_BITMAP_MODE_LM));
> +
> +	if (changed & (MSR_BITMAP_MODE_X2APIC | MSR_BITMAP_MODE_X2APIC_APICV))
> +		vmx_update_msr_bitmap_x2apic(msr_bitmap, mode);
> +
> +	vmx->msr_bitmap_mode = mode;
>   }
>   
>   static bool vmx_get_enable_apicv(struct kvm_vcpu *vcpu)
> @@ -5277,7 +5339,7 @@ static void vmx_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
>   	}
>   
>   	if (cpu_has_vmx_msr_bitmap())
> -		vmx_set_msr_bitmap(vcpu);
> +		vmx_update_msr_bitmap(vcpu);
>   }
>   
>   static u32 vmx_exec_control(struct vcpu_vmx *vmx)
> @@ -5464,7 +5526,7 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
>   		vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmwrite_bitmap));
>   	}
>   	if (cpu_has_vmx_msr_bitmap())
> -		vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
> +		vmcs_write64(MSR_BITMAP, __pa(vmx->vmcs01.msr_bitmap));
>   
>   	vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
>   
> @@ -6747,7 +6809,7 @@ void vmx_enable_tdp(void)
>   
>   static __init int hardware_setup(void)
>   {
> -	int r = -ENOMEM, i, msr;
> +	int r = -ENOMEM, i;
>   
>   	rdmsrl_safe(MSR_EFER, &host_efer);
>   
> @@ -6767,9 +6829,6 @@ static __init int hardware_setup(void)
>   
>   	memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
>   
> -	memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
> -	memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
> -
>   	if (setup_vmcs_config(&vmcs_config) < 0) {
>   		r = -EIO;
>   		goto out;
> @@ -6838,42 +6897,8 @@ static __init int hardware_setup(void)
>   		kvm_tsc_scaling_ratio_frac_bits = 48;
>   	}
>   
> -	vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
> -	vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
> -	vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
> -	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
> -	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
> -	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
> -
> -	memcpy(vmx_msr_bitmap_legacy_x2apic_apicv,
> -			vmx_msr_bitmap_legacy, PAGE_SIZE);
> -	memcpy(vmx_msr_bitmap_longmode_x2apic_apicv,
> -			vmx_msr_bitmap_longmode, PAGE_SIZE);
> -	memcpy(vmx_msr_bitmap_legacy_x2apic,
> -			vmx_msr_bitmap_legacy, PAGE_SIZE);
> -	memcpy(vmx_msr_bitmap_longmode_x2apic,
> -			vmx_msr_bitmap_longmode, PAGE_SIZE);
> -
>   	set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
>   
> -	for (msr = 0x800; msr <= 0x8ff; msr++) {
> -		if (msr == 0x839 /* TMCCT */)
> -			continue;
> -		vmx_disable_intercept_msr_x2apic(msr, MSR_TYPE_R, true);
> -	}
> -
> -	/*
> -	 * TPR reads and writes can be virtualized even if virtual interrupt
> -	 * delivery is not in use.
> -	 */
> -	vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_W, true);
> -	vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_R | MSR_TYPE_W, false);
> -
> -	/* EOI */
> -	vmx_disable_intercept_msr_x2apic(0x80b, MSR_TYPE_W, true);
> -	/* SELF-IPI */
> -	vmx_disable_intercept_msr_x2apic(0x83f, MSR_TYPE_W, true);
> -
>   	if (enable_ept)
>   		vmx_enable_tdp();
>   	else
> @@ -7162,13 +7187,6 @@ static int enter_vmx_operation(struct kvm_vcpu *vcpu)
>   	if (r < 0)
>   		goto out_vmcs02;
>   
> -	if (cpu_has_vmx_msr_bitmap()) {
> -		vmx->nested.msr_bitmap =
> -				(unsigned long *)__get_free_page(GFP_KERNEL);
> -		if (!vmx->nested.msr_bitmap)
> -			goto out_msr_bitmap;
> -	}
> -
>   	vmx->nested.cached_vmcs12 = kmalloc(VMCS12_SIZE, GFP_KERNEL);
>   	if (!vmx->nested.cached_vmcs12)
>   		goto out_cached_vmcs12;
> @@ -7195,9 +7213,6 @@ static int enter_vmx_operation(struct kvm_vcpu *vcpu)
>   	kfree(vmx->nested.cached_vmcs12);
>   
>   out_cached_vmcs12:
> -	free_page((unsigned long)vmx->nested.msr_bitmap);
> -
> -out_msr_bitmap:
>   	free_loaded_vmcs(&vmx->nested.vmcs02);
>   
>   out_vmcs02:
> @@ -7343,10 +7358,6 @@ static void free_nested(struct vcpu_vmx *vmx)
>   	free_vpid(vmx->nested.vpid02);
>   	vmx->nested.posted_intr_nv = -1;
>   	vmx->nested.current_vmptr = -1ull;
> -	if (vmx->nested.msr_bitmap) {
> -		free_page((unsigned long)vmx->nested.msr_bitmap);
> -		vmx->nested.msr_bitmap = NULL;
> -	}
>   	if (enable_shadow_vmcs) {
>   		vmx_disable_shadow_vmcs(vmx);
>   		vmcs_clear(vmx->vmcs01.shadow_vmcs);
> @@ -8862,7 +8873,7 @@ static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
>   	}
>   	vmcs_write32(SECONDARY_VM_EXEC_CONTROL, sec_exec_control);
>   
> -	vmx_set_msr_bitmap(vcpu);
> +	vmx_update_msr_bitmap(vcpu);
>   }
>   
>   static void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu, hpa_t hpa)
> @@ -9523,6 +9534,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
>   {
>   	int err;
>   	struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
> +	unsigned long *msr_bitmap;
>   	int cpu;
>   
>   	if (!vmx)
> @@ -9559,6 +9571,15 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
>   	if (err < 0)
>   		goto free_msrs;
>   
> +	msr_bitmap = vmx->vmcs01.msr_bitmap;
> +	vmx_disable_intercept_for_msr(msr_bitmap, MSR_FS_BASE, MSR_TYPE_RW);
> +	vmx_disable_intercept_for_msr(msr_bitmap, MSR_GS_BASE, MSR_TYPE_RW);
> +	vmx_disable_intercept_for_msr(msr_bitmap, MSR_KERNEL_GS_BASE, MSR_TYPE_RW);
> +	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW);
> +	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW);
> +	vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW);
> +	vmx->msr_bitmap_mode = 0;
> +
>   	vmx->loaded_vmcs = &vmx->vmcs01;
>   	cpu = get_cpu();
>   	vmx_vcpu_load(&vmx->vcpu, cpu);
> @@ -10022,7 +10043,7 @@ static inline bool nested_vmx_merge_msr_bitmap(struct kvm_vcpu *vcpu,
>   	int msr;
>   	struct page *page;
>   	unsigned long *msr_bitmap_l1;
> -	unsigned long *msr_bitmap_l0 = to_vmx(vcpu)->nested.msr_bitmap;
> +	unsigned long *msr_bitmap_l0 = to_vmx(vcpu)->nested.vmcs02.msr_bitmap;
>   
>   	/* This shortcut is ok because we support only x2APIC MSRs so far. */
>   	if (!nested_cpu_has_virt_x2apic_mode(vmcs12))
> @@ -11397,7 +11418,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
>   	vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
>   
>   	if (cpu_has_vmx_msr_bitmap())
> -		vmx_set_msr_bitmap(vcpu);
> +		vmx_update_msr_bitmap(vcpu);
>   
>   	if (nested_vmx_load_msr(vcpu, vmcs12->vm_exit_msr_load_addr,
>   				vmcs12->vm_exit_msr_load_count))