From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: [PATCH 1/3] x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available Date: Thu, 31 Jan 2019 12:57:56 +0100 Message-ID: <20190131115756.GA19969@kroah.com> References: <1548929853-25877-1-git-send-email-Tianyu.Lan@microsoft.com> <1548929853-25877-2-git-send-email-Tianyu.Lan@microsoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1548929853-25877-2-git-send-email-Tianyu.Lan@microsoft.com> Sender: linux-kernel-owner@vger.kernel.org To: lantianyu1986@gmail.com Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mchehab+samsung@kernel.org, sashal@kernel.org, sthemmin@microsoft.com, joro@8bytes.org, x86@kernel.org, michael.h.kelley@microsoft.com, mingo@redhat.com, Lan Tianyu , arnd@arndb.de, haiyangz@microsoft.com, alex.williamson@redhat.com, bp@alien8.de, tglx@linutronix.de, vkuznets@redhat.com, nicolas.ferre@microchip.com, iommu@lists.linux-foundation.org, devel@linuxdriverproject.org, akpm@linux-foundation.org, davem@davemloft.net List-Id: iommu@lists.linux-foundation.org On Thu, Jan 31, 2019 at 06:17:31PM +0800, lantianyu1986@gmail.com wrote: > From: Lan Tianyu > > Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic, > set x2apic destination mode to physcial mode when x2apic is available > and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs have > 8-bit APIC id. > > Signed-off-by: Lan Tianyu > --- > arch/x86/kernel/cpu/mshyperv.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c > index e81a2db..9d62f33 100644 > --- a/arch/x86/kernel/cpu/mshyperv.c > +++ b/arch/x86/kernel/cpu/mshyperv.c > @@ -36,6 +36,8 @@ > struct ms_hyperv_info ms_hyperv; > EXPORT_SYMBOL_GPL(ms_hyperv); > > +extern int x2apic_phys; Shouldn't this be in a .h file somewhere instead? thanks, greg k-h