* Re: [PATCH RESEND] KVM: X86: eliminate obsolete KVM_GET_CPUID2 ioctl
@ 2020-02-25 1:38 linmiaohe
0 siblings, 0 replies; 3+ messages in thread
From: linmiaohe @ 2020-02-25 1:38 UTC (permalink / raw)
To: Vitaly Kuznetsov
Cc: kvm, linux-kernel, x86, pbonzini, rkrcmar, sean.j.christopherson,
wanpengli, jmattson, joro, tglx, mingo, bp, hpa
Vitaly Kuznetsov <vkuznets@redhat.com> writes:
>linmiaohe <linmiaohe@huawei.com> writes:
>
>> KVM_GET_CPUID2 ioctl is straight up broken
>
>It may make sense to add the gory details from your previous patch where you were trying to fix it.
Will do.
>> and not used anywhere. Remove it directly.
>>
>> Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
>> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
>> #define KVM_GET_LAPIC _IOR(KVMIO, 0x8e, struct kvm_lapic_state)
>> #define KVM_SET_LAPIC _IOW(KVMIO, 0x8f, struct kvm_lapic_state)
>> #define KVM_SET_CPUID2 _IOW(KVMIO, 0x90, struct kvm_cpuid2)
>> -#define KVM_GET_CPUID2 _IOWR(KVMIO, 0x91, struct kvm_cpuid2)
>
>Even if we decide to be strong and remove KVM_GET_CPUID2 completely, I'd suggest we leave a comment here saying that it was deprecated. Leaving the branch in case (returning the same -EINVAL as passing an unsupported
>IOCTL) may also make sense (with a 'deprecated' comment of course).
>
Sounds reasonable. Will try. Many thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH RESEND] KVM: X86: eliminate obsolete KVM_GET_CPUID2 ioctl
@ 2020-02-24 3:47 linmiaohe
2020-02-24 10:06 ` Vitaly Kuznetsov
0 siblings, 1 reply; 3+ messages in thread
From: linmiaohe @ 2020-02-24 3:47 UTC (permalink / raw)
To: pbonzini, rkrcmar, sean.j.christopherson, vkuznets, wanpengli,
jmattson, joro, tglx, mingo, bp, hpa
Cc: linmiaohe, kvm, linux-kernel, x86
From: Miaohe Lin <linmiaohe@huawei.com>
KVM_GET_CPUID2 ioctl is straight up broken and not used anywhere. Remove
it directly.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
arch/x86/kvm/cpuid.c | 20 --------------------
arch/x86/kvm/cpuid.h | 3 ---
arch/x86/kvm/x86.c | 17 -----------------
include/uapi/linux/kvm.h | 1 -
tools/include/uapi/linux/kvm.h | 1 -
5 files changed, 42 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index b1c469446b07..5e041a1282b8 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -261,26 +261,6 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
return r;
}
-int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
- struct kvm_cpuid2 *cpuid,
- struct kvm_cpuid_entry2 __user *entries)
-{
- int r;
-
- r = -E2BIG;
- if (cpuid->nent < vcpu->arch.cpuid_nent)
- goto out;
- r = -EFAULT;
- if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
- vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
- goto out;
- return 0;
-
-out:
- cpuid->nent = vcpu->arch.cpuid_nent;
- return r;
-}
-
static __always_inline void cpuid_mask(u32 *word, int wordnum)
{
reverse_cpuid_check(wordnum);
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index 7366c618aa04..76555de38e1b 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -19,9 +19,6 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
struct kvm_cpuid2 *cpuid,
struct kvm_cpuid_entry2 __user *entries);
-int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
- struct kvm_cpuid2 *cpuid,
- struct kvm_cpuid_entry2 __user *entries);
bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
u32 *ecx, u32 *edx, bool check_limit);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fbabb2f06273..ddcc51b89e2c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4286,23 +4286,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
cpuid_arg->entries);
break;
}
- case KVM_GET_CPUID2: {
- struct kvm_cpuid2 __user *cpuid_arg = argp;
- struct kvm_cpuid2 cpuid;
-
- r = -EFAULT;
- if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
- goto out;
- r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
- cpuid_arg->entries);
- if (r)
- goto out;
- r = -EFAULT;
- if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
- goto out;
- r = 0;
- break;
- }
case KVM_GET_MSRS: {
int idx = srcu_read_lock(&vcpu->kvm->srcu);
r = msr_io(vcpu, argp, do_get_msr, 1);
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 4b95f9a31a2f..b37b8c1f300e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1380,7 +1380,6 @@ struct kvm_s390_ucas_mapping {
#define KVM_GET_LAPIC _IOR(KVMIO, 0x8e, struct kvm_lapic_state)
#define KVM_SET_LAPIC _IOW(KVMIO, 0x8f, struct kvm_lapic_state)
#define KVM_SET_CPUID2 _IOW(KVMIO, 0x90, struct kvm_cpuid2)
-#define KVM_GET_CPUID2 _IOWR(KVMIO, 0x91, struct kvm_cpuid2)
/* Available with KVM_CAP_VAPIC */
#define KVM_TPR_ACCESS_REPORTING _IOWR(KVMIO, 0x92, struct kvm_tpr_access_ctl)
/* Available with KVM_CAP_VAPIC */
diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
index f0a16b4adbbd..431106dedd2c 100644
--- a/tools/include/uapi/linux/kvm.h
+++ b/tools/include/uapi/linux/kvm.h
@@ -1379,7 +1379,6 @@ struct kvm_s390_ucas_mapping {
#define KVM_GET_LAPIC _IOR(KVMIO, 0x8e, struct kvm_lapic_state)
#define KVM_SET_LAPIC _IOW(KVMIO, 0x8f, struct kvm_lapic_state)
#define KVM_SET_CPUID2 _IOW(KVMIO, 0x90, struct kvm_cpuid2)
-#define KVM_GET_CPUID2 _IOWR(KVMIO, 0x91, struct kvm_cpuid2)
/* Available with KVM_CAP_VAPIC */
#define KVM_TPR_ACCESS_REPORTING _IOWR(KVMIO, 0x92, struct kvm_tpr_access_ctl)
/* Available with KVM_CAP_VAPIC */
--
2.19.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH RESEND] KVM: X86: eliminate obsolete KVM_GET_CPUID2 ioctl
2020-02-24 3:47 linmiaohe
@ 2020-02-24 10:06 ` Vitaly Kuznetsov
0 siblings, 0 replies; 3+ messages in thread
From: Vitaly Kuznetsov @ 2020-02-24 10:06 UTC (permalink / raw)
To: linmiaohe
Cc: kvm, linux-kernel, x86, pbonzini, rkrcmar, sean.j.christopherson,
wanpengli, jmattson, joro, tglx, mingo, bp, hpa
linmiaohe <linmiaohe@huawei.com> writes:
> From: Miaohe Lin <linmiaohe@huawei.com>
>
> KVM_GET_CPUID2 ioctl is straight up broken
It may make sense to add the gory details from your previous patch where
you were trying to fix it.
> and not used anywhere. Remove it directly.
>
> Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> arch/x86/kvm/cpuid.c | 20 --------------------
> arch/x86/kvm/cpuid.h | 3 ---
> arch/x86/kvm/x86.c | 17 -----------------
> include/uapi/linux/kvm.h | 1 -
> tools/include/uapi/linux/kvm.h | 1 -
> 5 files changed, 42 deletions(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index b1c469446b07..5e041a1282b8 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -261,26 +261,6 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
> return r;
> }
>
> -int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
> - struct kvm_cpuid2 *cpuid,
> - struct kvm_cpuid_entry2 __user *entries)
> -{
> - int r;
> -
> - r = -E2BIG;
> - if (cpuid->nent < vcpu->arch.cpuid_nent)
> - goto out;
> - r = -EFAULT;
> - if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
> - vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
> - goto out;
> - return 0;
> -
> -out:
> - cpuid->nent = vcpu->arch.cpuid_nent;
> - return r;
> -}
> -
> static __always_inline void cpuid_mask(u32 *word, int wordnum)
> {
> reverse_cpuid_check(wordnum);
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index 7366c618aa04..76555de38e1b 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -19,9 +19,6 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
> int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
> struct kvm_cpuid2 *cpuid,
> struct kvm_cpuid_entry2 __user *entries);
> -int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
> - struct kvm_cpuid2 *cpuid,
> - struct kvm_cpuid_entry2 __user *entries);
> bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
> u32 *ecx, u32 *edx, bool check_limit);
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fbabb2f06273..ddcc51b89e2c 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -4286,23 +4286,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
> cpuid_arg->entries);
> break;
> }
> - case KVM_GET_CPUID2: {
> - struct kvm_cpuid2 __user *cpuid_arg = argp;
> - struct kvm_cpuid2 cpuid;
> -
> - r = -EFAULT;
> - if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid)))
> - goto out;
> - r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
> - cpuid_arg->entries);
> - if (r)
> - goto out;
> - r = -EFAULT;
> - if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid)))
> - goto out;
> - r = 0;
> - break;
> - }
> case KVM_GET_MSRS: {
> int idx = srcu_read_lock(&vcpu->kvm->srcu);
> r = msr_io(vcpu, argp, do_get_msr, 1);
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 4b95f9a31a2f..b37b8c1f300e 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1380,7 +1380,6 @@ struct kvm_s390_ucas_mapping {
> #define KVM_GET_LAPIC _IOR(KVMIO, 0x8e, struct kvm_lapic_state)
> #define KVM_SET_LAPIC _IOW(KVMIO, 0x8f, struct kvm_lapic_state)
> #define KVM_SET_CPUID2 _IOW(KVMIO, 0x90, struct kvm_cpuid2)
> -#define KVM_GET_CPUID2 _IOWR(KVMIO, 0x91, struct kvm_cpuid2)
Even if we decide to be strong and remove KVM_GET_CPUID2 completely, I'd
suggest we leave a comment here saying that it was deprecated. Leaving
the branch in case (returning the same -EINVAL as passing an unsupported
IOCTL) may also make sense (with a 'deprecated' comment of course).
> /* Available with KVM_CAP_VAPIC */
> #define KVM_TPR_ACCESS_REPORTING _IOWR(KVMIO, 0x92, struct kvm_tpr_access_ctl)
> /* Available with KVM_CAP_VAPIC */
> diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
> index f0a16b4adbbd..431106dedd2c 100644
> --- a/tools/include/uapi/linux/kvm.h
> +++ b/tools/include/uapi/linux/kvm.h
> @@ -1379,7 +1379,6 @@ struct kvm_s390_ucas_mapping {
> #define KVM_GET_LAPIC _IOR(KVMIO, 0x8e, struct kvm_lapic_state)
> #define KVM_SET_LAPIC _IOW(KVMIO, 0x8f, struct kvm_lapic_state)
> #define KVM_SET_CPUID2 _IOW(KVMIO, 0x90, struct kvm_cpuid2)
> -#define KVM_GET_CPUID2 _IOWR(KVMIO, 0x91, struct kvm_cpuid2)
> /* Available with KVM_CAP_VAPIC */
> #define KVM_TPR_ACCESS_REPORTING _IOWR(KVMIO, 0x92, struct kvm_tpr_access_ctl)
> /* Available with KVM_CAP_VAPIC */
--
Vitaly
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-02-24 3:47 linmiaohe
2020-02-24 10:06 ` Vitaly Kuznetsov
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