Re: [PATCH v3 2/4] x86: Remap GDT tables in the Fixmap section

From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Thomas Garnier <thgarnie@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Kees Cook <keescook@chromium.org>,
	Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@suse.de>,
	Paul Gortmaker <paul.gortmaker@windriver.com>,
	Andy Lutomirski <luto@amacapital.net>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
	Jiri Kosina <jikos@kernel.org>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Juergen Gross <jgross@suse.com>,
	Rusty Russell <rusty@rustcorp.com.au>,
	Peter Zijlstra <peterz@infradead.org>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	"Luis R . Rodriguez" <mcgrof@kernel.org>
Cc: linux-efi@vger.kernel.org, kvm@vger.kernel.org,
	linux-pm@vger.kernel.org, x86@kernel.org,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	lguest@lists.ozlabs.org, kernel-hardening@lists.openwall.com,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH v3 2/4] x86: Remap GDT tables in the Fixmap section
Date: Wed, 15 Feb 2017 10:37:13 -0500	[thread overview]
Message-ID: <3b2210d0-b76d-48b6-c232-8304d915a755__23261.8261049085$1487173106$gmane$org@oracle.com> (raw)
In-Reply-To: <20170214194259.75960-2-thgarnie@google.com>

On 02/14/2017 02:42 PM, Thomas Garnier wrote:
> diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
> index 0dee6f59ea82..6399bab936cd 100644
> --- a/arch/x86/xen/smp.c
> +++ b/arch/x86/xen/smp.c
> @@ -391,7 +391,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
>  	if (ctxt == NULL)
>  		return -ENOMEM;
>  
> -	gdt = get_cpu_gdt_table(cpu);
> +	gdt = get_cpu_gdt_rw(cpu);
>  
>  #ifdef CONFIG_X86_32
>  	ctxt->user_regs.fs = __KERNEL_PERCPU;

Which tree are these patches against? The chunk above cannot be applied
to current Linus tree but it can be applied against Xen staging tree
that has not been pulled yet.

I can apply this manually but the series crashes PV guests so I want to
make sure I am using right bits.

-boris

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