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Date: Tue, 14 Jul 2020 18:23:47 -0700 From: Kees Cook <keescook@...omium.org> To: Joerg Roedel <joro@...tes.org> Cc: x86@...nel.org, Joerg Roedel <jroedel@...e.de>, hpa@...or.com, Andy Lutomirski <luto@...nel.org>, Dave Hansen <dave.hansen@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, Jiri Slaby <jslaby@...e.cz>, Dan Williams <dan.j.williams@...el.com>, Tom Lendacky <thomas.lendacky@....com>, Juergen Gross <jgross@...e.com>, David Rientjes <rientjes@...gle.com>, Cfir Cohen <cfir@...gle.com>, Erdem Aktas <erdemaktas@...gle.com>, Masami Hiramatsu <mhiramat@...nel.org>, Mike Stunes <mstunes@...are.com>, Sean Christopherson <sean.j.christopherson@...el.com>, Martin Radev <martin.b.radev@...il.com>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org Subject: Re: [PATCH v4 15/75] x86/boot/compressed/64: Always switch to own page-table On Tue, Jul 14, 2020 at 02:08:17PM +0200, Joerg Roedel wrote: > From: Joerg Roedel <jroedel@...e.de> > > When booted through startup_64 the kernel keeps running on the EFI > page-table until the KASLR code sets up its own page-table. Without > KASLR the pre-decompression boot code never switches off the EFI > page-table. Change that by unconditionally switching to a kernel > controlled page-table after relocation. > > This makes sure we can make changes to the mapping when necessary, for > example map pages unencrypted in SEV and SEV-ES guests. > > Also remove the debug_putstr() calls in initialize_identity_maps() > because the function now runs before console_init() is called. > > Signed-off-by: Joerg Roedel <jroedel@...e.de> Reviewed-by: Kees Cook <keescook@...omium.org> -- Kees Cook
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