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Date: Thu, 6 Sep 2018 11:45:03 -0700 From: Sean Christopherson <sean.j.christopherson@...el.com> To: Borislav Petkov <bp@...e.de> Cc: Brijesh Singh <brijesh.singh@....com>, x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, Tom Lendacky <thomas.lendacky@....com>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Paolo Bonzini <pbonzini@...hat.com>, Radim Krčmář <rkrcmar@...hat.com> Subject: Re: [PATCH v5 5/5] x86/kvm: Avoid dynamic allocation of pvclock data when SEV is active On Thu, Sep 06, 2018 at 08:33:34PM +0200, Borislav Petkov wrote: > On Thu, Sep 06, 2018 at 08:54:52AM -0700, Sean Christopherson wrote: > > My thought was that we could simply define a second array for the SEV > > case to statically allocate for NR_CPUS since __decrypted has a big > > chunk of memory that would be ununsed anyways[1]. And since the second > > array is only used for SEV it can be freed if !SEV. > > Lemme see if I get it straight: > > __decrypted: > > 4K > > __decrypted_XXX: > > ((num_possible_cpus() * 32) / 4K) pages > > __decrypted_end: > > Am I close? Yep, though because the 4k chunk in __decrypted is @hv_clock_boot that's used for cpus 0-127, __decrypted_XXX would effectively be: (((num_possible_cpus() * 32) / 4k) - 1) pages
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