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Message-ID: <CALCETrXDQaWyo02b2q7JN3W1frR0QAOy1Wj_ft5YpPbEbZEfPw@mail.gmail.com>
Date: Tue, 14 Feb 2017 19:57:21 -0800
From: Andy Lutomirski <luto@...capital.net>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>, Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>,
Kees Cook <keescook@...omium.org>, Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>,
Paul Gortmaker <paul.gortmaker@...driver.com>, "Rafael J . Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>, Jiri Kosina <jikos@...nel.org>,
Matt Fleming <matt@...eblueprint.co.uk>, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>, Juergen Gross <jgross@...e.com>,
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"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, kasan-dev <kasan-dev@...glegroups.com>,
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kvm list <kvm@...r.kernel.org>,
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Subject: Re: [PATCH v3 4/4] KVM: VMX: Simplify segment_base
On Tue, Feb 14, 2017 at 11:42 AM, Thomas Garnier <thgarnie@...gle.com> wrote:
> The KVM segment_base function is confusing. This patch replaces integers
> with appropriate flags, simplify constructs and add comments.
It could pay to put this first in the series, but last is probably fine, too.
>
> Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
> ---
> Based on next-20170213
> ---
> arch/x86/kvm/vmx.c | 26 ++++++++++++++++++--------
> 1 file changed, 18 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 99167f20bc34..edb8326108dd 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -2062,25 +2062,35 @@ static unsigned long segment_base(u16 selector)
> struct desc_struct *d;
> unsigned long table_base;
This should go away IMO. It should be struct desc_struct *table;
> + table_base = get_current_gdt_rw_vaddr();
Then this can go away, too, and you can stop having the silly
get_current_gdt_rw_vaddr() function at all.
> + d = (struct desc_struct *)table_base + (selector >> 3);
And this cast goes away too.
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