linux-kernel - Re: [PATCH v17 04/10] x86: kdump: move xen_pv_domain() check and insert_resource() to setup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20211215092230.GE3023@MiWiFi-R3L-srv>
Date:   Wed, 15 Dec 2021 17:22:30 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org, Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        kexec@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>
Subject: Re: [PATCH v17 04/10] x86: kdump: move xen_pv_domain() check and
 insert_resource() to setup_arch()

On 12/15/21 at 04:56pm, Leizhen (ThunderTown) wrote:
> 
> 
> On 2021/12/14 19:40, Leizhen (ThunderTown) wrote:
> > 
> > 
> > On 2021/12/10 14:55, Zhen Lei wrote:
> >> From: Chen Zhou <chenzhou10@...wei.com>
> >>
> >> We will make the functions reserve_crashkernel() as generic, the
> >> xen_pv_domain() check in reserve_crashkernel() is relevant only to
> >> x86, the same as insert_resource() in reserve_crashkernel[_low]().
> >> So move xen_pv_domain() check and insert_resource() to setup_arch()
> >> to keep them in x86.
> >>
> >> Suggested-by: Mike Rapoport <rppt@...nel.org>
> >> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> >> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> >> Tested-by: John Donnelly <John.p.donnelly@...cle.com>
> >> Tested-by: Dave Kleikamp <dave.kleikamp@...cle.com>
> >> Acked-by: Baoquan He <bhe@...hat.com>
> >> ---
> >>  arch/x86/kernel/setup.c | 19 +++++++++++--------
> >>  1 file changed, 11 insertions(+), 8 deletions(-)
> >>
> >> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> >> index bb2a0973b98059e..7ae00716a208f82 100644
> >> --- a/arch/x86/kernel/setup.c
> >> +++ b/arch/x86/kernel/setup.c
> >> @@ -456,7 +456,6 @@ static int __init reserve_crashkernel_low(void)
> >>  
> >>  	crashk_low_res.start = low_base;
> >>  	crashk_low_res.end   = low_base + low_size - 1;
> >> -	insert_resource(&iomem_resource, &crashk_low_res);
> >>  #endif
> >>  	return 0;
> >>  }
> >> @@ -480,11 +479,6 @@ static void __init reserve_crashkernel(void)
> >>  		high = true;
> >>  	}
> >>  
> >> -	if (xen_pv_domain()) {
> >> -		pr_info("Ignoring crashkernel for a Xen PV domain\n");
> >> -		return;
> >> -	}
> >> -
> >>  	/* 0 means: find the address automatically */
> >>  	if (!crash_base) {
> >>  		/*
> >> @@ -531,7 +525,6 @@ static void __init reserve_crashkernel(void)
> >>  
> >>  	crashk_res.start = crash_base;
> >>  	crashk_res.end   = crash_base + crash_size - 1;
> >> -	insert_resource(&iomem_resource, &crashk_res);
> >>  }
> >>  #else
> >>  static void __init reserve_crashkernel(void)
> >> @@ -1143,7 +1136,17 @@ void __init setup_arch(char **cmdline_p)
> >>  	 * Reserve memory for crash kernel after SRAT is parsed so that it
> >>  	 * won't consume hotpluggable memory.
> >>  	 */
> >> -	reserve_crashkernel();
> > 
> > Hi Baoquan:
> >   How about move "#ifdef CONFIG_KEXEC_CORE" here, so that we can remove the
> > empty reserve_crashkernel(). In fact, xen_pv_domain() is invoked only
> > when CONFIG_KEXEC_CORE is enabled before.
> 
> Hi Baoquan:
>   Did you miss this email? If no reply, I will keep it no change.

I checked this patch, and it's no update since I acked it. 

Moving reserve_crashkernel() into the CONFIG_KEXEC_CORE ifdeffery is
also fine to me.