lkml.org 
[lkml]   [2020]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 5/6] KVM: x86: Rename "found" variable in kvm_cpuid() to "exact_entry_exists"
From
Date
On 02.03.20 20:57, Sean Christopherson wrote:
> Rename "found" in kvm_cpuid() to "exact_entry_exists" to better convey
> that the intent of the tracepoint's "found/not found" output is to trace
> whether the output values are for the actual requested leaf or for some
> other (likely unrelated) leaf that was found while processing entries to
> emulate funky CPU behavior, e.g. the max basic leaf on Intel CPUs when
> the requested CPUID leaf is out of range.
>
> Suggested-by: Jan Kiszka <jan.kiszka@siemens.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kvm/cpuid.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 869526930cf7..b0a4f3c17932 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -1002,10 +1002,10 @@ void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
> {
> const u32 function = *eax, index = *ecx;
> struct kvm_cpuid_entry2 *entry;
> - bool found;
> + bool exact_entry_exists;
>
> entry = kvm_find_cpuid_entry(vcpu, function, index);
> - found = entry;
> + exact_entry_exists = !!entry;
> /*
> * Intel CPUID semantics treats any query for an out-of-range
> * leaf as if the highest basic leaf (i.e. CPUID.0H:EAX) were
> @@ -1047,7 +1047,7 @@ void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
> }
> }
> }
> - trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx, found);
> + trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx, exact_entry_exists);

Actually, I think we also what to change output in the tracepoint.

Jan

> }
> EXPORT_SYMBOL_GPL(kvm_cpuid);
>
>

--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

\
 
 \ /
  Last update: 2020-03-02 21:22    [W:0.240 / U:0.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site