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Date: Wed, 15 Feb 2017 07:44:04 -0800
From: Thomas Garnier <thgarnie@...gle.com>
To: Andy Lutomirski <luto@...capital.net>
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>,
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kvm list <kvm@...r.kernel.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v3 4/4] KVM: VMX: Simplify segment_base
On Tue, Feb 14, 2017 at 7:57 PM, Andy Lutomirski <luto@...capital.net> wrote:
> 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.
No problem.
--
Thomas
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