From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lVtFN-0066Ix-Bw for kexec@lists.infradead.org; Mon, 12 Apr 2021 09:52:53 +0000 Date: Mon, 12 Apr 2021 17:52:31 +0800 From: Baoquan He Subject: Re: [PATCH] x86/efi: Do not release sub-1MB memory regions when the crashkernel option is specified Message-ID: <20210412095231.GC4282@MiWiFi-R3L-srv> References: <20210412011347.GA4282@MiWiFi-R3L-srv> <8FAA2A0E-0A09-4308-B936-CDD2C0568BAE@amacapital.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <8FAA2A0E-0A09-4308-B936-CDD2C0568BAE@amacapital.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Andy Lutomirski Cc: "H. Peter Anvin" , Lianbo Jiang , linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, x86@kernel.org, ardb@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dvhart@infradead.org, andy@infradead.org, kexec@lists.infradead.org, dyoung@redhat.com T24gMDQvMTEvMjEgYXQgMDY6NDlwbSwgQW5keSBMdXRvbWlyc2tpIHdyb3RlOgo+IAo+IAo+ID4g T24gQXByIDExLCAyMDIxLCBhdCA2OjE0IFBNLCBCYW9xdWFuIEhlIDxiaGVAcmVkaGF0LmNvbT4g d3JvdGU6Cj4gPiAKPiA+IO+7v09uIDA0LzA5LzIxIGF0IDA3OjU5cG0sIEguIFBldGVyIEFudmlu IHdyb3RlOgo+ID4+IFdoeSBkb24ndCB3ZSBkbyB0aGlzIHVuY29uZGl0aW9uYWxseT8gQXQgdGhl IHZlcnkgYmVzdCB3ZSBnYWluIGhhbGYgYSBtZWdhYnl0ZSBvZiBtZW1vcnkgKGV4Y2VwdCB0aGUg dHJhbXBvbGluZSwgd2hpY2ggaGFzIHRvIGxpdmUgdGhlcmUsIGJ1dCBpdCBpcyBvbmx5IGEgZmV3 IGtpbG9ieXRlcy4pCj4gPiAKPiA+IFRoaXMgaXMgYSBncmVhdCBzdWdnZXN0aW9uLCB0aGFua3Mu IEkgdGhpbmsgd2UgY2FuIGZpeCBpdCBpbiB0aGlzIHdheSB0bwo+ID4gbWFrZSBjb2RlIHNpbXBs ZXIuIFRoZW4gdGhlIHNwZWNpZmljIGNhcmluZyBvZiByZWFsIG1vZGUgaW4KPiA+IGVmaV9mcmVl X2Jvb3Rfc2VydmljZXMoKSBjYW4gYmUgcmVtb3ZlZCB0b28uCj4gPiAKPiAKPiBUaGlzIHdob2xl IHNpdHVhdGlvbiBtYWtlcyBtZSB0aGluayB0aGF0IHRoZSBjb2RlIGlzIGJ1Z2d5IGJlZm9yZSBh bmQgYnVnZ3kgYWZ0ZXIuCj4gCj4gVGhlIGlzc3VlIGhlcmUgKEkgdGhpbmspIGlzIHRoYXQgdmFy aW91cyBwaWVjZXMgb2YgY29kZSB3YW50IHRvIHJlc2VydmUgc3BlY2lmaWMgcGllY2VzIG9mIG90 aGVyd2lzZS1hdmFpbGFibGUgbG93IG1lbW9yeSBmb3IgdGhlaXIgb3duIG5lZmFyaW91cyB1c2Vz LiBJIGRvbuKAmXQga25vdyAqd2h5KiBjcmFzaCBrZXJuZWwgbmVlZHMgdGhpcywgYnV0IHRoYXQg ZG9lc27igJl0IG1hdHRlciB0b28gbXVjaC4KCktkdW1wIGtlcm5lbCBhbHNvIG5lZWQgZ28gdGhy b3VnaCByZWFsIG1vZGUgY29kZSBwYXRoIGR1cmluZyBib290dXAuIEl0CmlzIG5vdCBkaWZmZXJl bnQgdGhhbiBub3JtYWwga2VybmVsIGV4Y2VwdCB0aGF0IGl0IHNraXBzIHRoZSBmaXJtd2FyZQpy ZXNldHRpbmcuIFNvIGtkdW1wIGtlcm5lbCBuZWVkcyBsb3cgMU0gYXMgc3lzdGVtIFJBTSBqdXN0 IGFzIG5vcm1hbAprZXJuZWwgZG9lcy4gSGVyZSB3ZSByZXNlcnZlIHRoZSB3aG9sZSBsb3cgMU0g d2l0aCBtZW1ibG9ja19yZXNlcnZlKCkKdG8gYXZvaWQgYW55IGxhdGVyIGtlcm5lbCBvciBkcml2 ZXIgZGF0YSByZXNpZGUgaW4gdGhpcyBhcmVhLiBPdGhlcndpc2UsCndlIG5lZWQgZHVtcCB0aGUg Y29udGVudCBvZiB0aGlzIGFyZWEgdG8gdm1jb3JlLiBBcyB3ZSBrbm93LCB3aGVuIGNyYXNoCmhh cHBlbmVkLCB0aGUgb2xkIG1lbW9yeSBvZiAxc3Qga2VybmVsIHNob3VsZCBiZSB1bnRvdWNoZWQg dW50aWwgdm1jb3JlCmR1bXBpbmcgcmVhZCBvdXQgaXRzIGNvbnRlbnQuIE1lYW53aGlsZSwga2R1 bXAga2VybmVsIG5lZWQgcmV1c2UgbG93IDFNLgpJbiB0aGUgcGFzdCwgd2UgdXNlZCBhIGJhY2sg dXAgcmVnaW9uIHRvIGNvcHkgb3V0IHRoZSBsb3cgMU0gYXJlYSwgYW5kCm1hcCB0aGUgYmFjayB1 cCByZWdpb24gaW50byB0aGUgbG93IDFNIGFyZWEgaW4gdm1jb3JlIGVsZiBmaWxlLiBJbgo2ZjU5 OWQ4NDIzMWZkMjcgKCJ4ODYva2R1bXA6IEFsd2F5cyByZXNlcnZlIHRoZSBsb3cgMU0gd2hlbiB0 aGUgY3Jhc2hrZXJuZWwKb3B0aW9uIGlzIHNwZWNpZmllZCIpLCB3ZSBjaGFuZ2VkIHRvIGxvY2sg dGhlIHdob2xlIGxvdyAxTSB0byBhdm9pZAp3cml0dGluZyBhbnkga2VybmVsIGRhdGEgaW50bywg bGlrZSB0aGlzIHdlIGNhbiBza2lwIHRoaXMgYXJlYSB3aGVuCmR1bXBpbmcgdm1jb3JlLgoKQWJv dmUgaXMgd2h5IHdlIHRyeSB0byBtZW1ibG9jayByZXNlcnZlIHRoZSB3aG9sZSBsb3cgMU0uIFdl IGRvbid0IHdhbnQKdG8gdXNlIGl0LCBqdXN0IGRvbid0IHdhbnQgYW55b25lIHRvIHVzZSBpdCBp biAxc3Qga2VybmVsLgoKPiAKPiBJIHByb3Bvc2UgdGhhdCB0aGUgcmlnaHQgc29sdXRpb24gaXMg dG8gZ2l2ZSBsb3ctbWVtb3J5LXJlc2VydmluZyBjb2RlIHBhdGhzIHR3byBjaGFuY2VzIHRvIGRv IHdoYXQgdGhleSBuZWVkOiBvbmNlIGF0IHRoZSB2ZXJ5IGJlZ2lubmluZyBhbmQgb25jZSBhZnRl ciBFRkkgYm9vdCBzZXJ2aWNlcyBhcmUgZnJlZWQuCj4gCj4gQWx0ZXJuYXRpdmVseSwganVzdCBy ZXNlcnZlICphbGwqIG90aGVyd2lzZSB1bnVzZWQgc3ViIDFNIG1lbW9yeSB1cCBmcm9udCwgdGhl biByZWxlYXNlIGl0IHJpZ2h0IGFmdGVyIHJlbGVhc2luZyBib290IHNlcnZpY2VzLCBhbmQgdGhl biBpbnZva2UgdGhlIHNwZWNpYWwgY2FzZXMgZXhhY3RseSBvbmNlLgoKSSBhbSBub3Qgc3VyZSBp ZiBJIGdvdCBib3RoIHN1Z2dlc3RlZCB3YXlzIGNsZWFybHkuIFRoZXkgbG9vayBhIGxpdHRsZQpj b21wbGljYXRlZCBpbiBvdXIgY2FzZS4gQXMgSSBleHBsYWluZWQgYXQgYWJvdmUsIHdlIHdhbnQg dGhlIHdob2xlIGxvdwoxTSBsb2NrZWQgdXAsIG5vdCBvbmUgcGllY2Ugb3Igc29tZSBwaWVjZXMg b2YgaXQuCgo+IAo+IEluIGVpdGhlciBjYXNlLCB0aGUgcmVzdWx0IGlzIHRoYXQgdGhlIGNyYXNo a2VybmVsIG1lc3MgZ2V0cyB1bmlmaWVkIHdpdGggdGhlIHRyYW1wb2xpbmUgbWVzcy4gIE9uZSB3 YXkgdGhlIHJlc3VsdCBpcyBjYWxsZWQgdHdpY2UgYW5kIG5lZWRzIHRvIGJlIG1vcmUgY2FyZWZ1 bCwgYW5kIHRoZSBvdGhlciB3YXkgaXTigJlzIGNhbGxlZCBvbmx5IG9uY2UuCj4gCj4gSnVzdCBz a2lwcGluZyBmcmVlaW5nIGJvb3Qgc2VydmljZXMgc2VlbXMgd3JvbmcuICBJdCBkb2VzbuKAmXQg dW5tYXAgYm9vdCBzZXJ2aWNlcywgYW5kIHNraXBwaW5nIHRoYXQgaXMgaW5jb3JyZWN0LCBJIHRo aW5rLiBBbmQgaXQgc2VlbXMgdG8gcmVzdWx0IGluIGEgYm9ndXMgbWVtb3J5IG1hcCBpbiB3aGlj aCB0aGUgc3lzdGVtIHRoaW5rcyB0aGF0IHNvbWUgY3Jhc2hrZXJuZWwgbWVtb3J5IGlzIEVGSSBt ZW1vcnkgaW5zdGVhZC4KCkkgbGlrZSBocGEncyB0aG91Z2h0IHRvIGxvY2sgdGhlIHdob2xlIGxv dyAxTSB1bmNvbmRpdGlvbmFsbHkgc2luY2Ugb25seQphIGZldyBLQiBleGNlcHQgb2YgdHJhbXBv bGluZSBhcmVhIGlzIHRoZXJlLiBSZXRoaW5raW5nIGFib3V0IGl0LCBkb2luZwppdCBpbiBjYW5f ZnJlZV9yZWdpb24oKSBtYXkgYmUgcmlza3kgYmVjYXVzZSBlZmkgbWVtb3J5IHJlZ2lvbiBjb3Vs ZApjcm9zcyB0aGUgMU0gYm91bmRhcnksIGUuZyBbNjQwSywgMTAwTV0gd2l0aCB0eXBlIG9mCkVG SV9CT09UX1NFUlZJQ0VTX0NPREV8RUZJX0JPT1RfU0VSVklDRVNfREFUQSwgaXQgY291bGQgY2F1 c2UgbG9zcyBvZiBtZW1vcnkuCkp1c3QgYSB3aWxkIGd1ZXNzLCBub3QgdmVyeSBzdXJlIGlmIHRo ZSAxTSBib3VuZGFyeSBjb3Jzc2luZyBjYW4gcmVhbGx5CmhhcHBlbi4gZWZpX3Jlc2VydmVfYm9v dF9zZXJ2aWNlcygpIHdvbid0IHNwbGl0IHJlZ2lvbnMuCgpJZiBtb3ZpbmcgZWZpX3Jlc2VydmVf Ym9vdF9zZXJ2aWNlcygpIGFmdGVyIHJlc2VydmVfcmVhbF9tb2RlKCkgaXMgbm90CmFjY2VwdGVk LCBtYXliZSB3ZSBjYW4gY2FsbCBlZmlfbWVtX3Jlc2VydmUoMCwgMU0pIGp1c3QgYXMKZWZpX2Vz cnRfaW5pdCgpIGhhcyBkb25lLgoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fCmtleGVjIG1haWxpbmcgbGlzdAprZXhlY0BsaXN0cy5pbmZyYWRlYWQub3Jn Cmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8va2V4ZWMK