From: Borislav Petkov <bp@suse.de>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "Brijesh Singh" <brijesh.singh@amd.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, "Tom Lendacky" <thomas.lendacky@amd.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [PATCH v5 5/5] x86/kvm: Avoid dynamic allocation of pvclock data when SEV is active
Date: Thu, 6 Sep 2018 17:19:38 +0200 [thread overview]
Message-ID: <20180906151938.GD11144@zn.tnic> (raw)
In-Reply-To: <20180906145639.GA1522@linux.intel.com>
On Thu, Sep 06, 2018 at 07:56:40AM -0700, Sean Christopherson wrote:
> Wouldn't that result in @hv_clock_boot being incorrectly freed in the
> !SEV case?
Ok, maybe I'm missing something but why do we need 4K per CPU? Why can't
we map all those pages which contain the clock variable, decrypted in
all guests' page tables?
Basically
(NR_CPUS * sizeof(struct pvclock_vsyscall_time_info)) / 4096
pages.
For the !SEV case then nothing changes.
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--
next prev parent reply other threads:[~2018-09-06 15:19 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 11:42 [PATCH v5 0/5] x86: Fix SEV guest regression Brijesh Singh
2018-09-06 11:42 ` [PATCH v5 1/5] x86/mm: Restructure sme_encrypt_kernel() Brijesh Singh
2018-09-06 11:42 ` [PATCH v5 2/5] x86/mm: fix sme_populate_pgd() to update page flags Brijesh Singh
2018-09-06 11:43 ` [PATCH v5 3/5] x86/mm: add .data..decrypted section to hold shared variables Brijesh Singh
2018-09-06 11:43 ` [PATCH v5 4/5] x86/kvm: use __decrypted attribute in " Brijesh Singh
2018-09-06 11:43 ` [PATCH v5 5/5] x86/kvm: Avoid dynamic allocation of pvclock data when SEV is active Brijesh Singh
2018-09-06 12:24 ` Borislav Petkov
2018-09-06 13:50 ` Sean Christopherson
2018-09-06 14:18 ` Sean Christopherson
2018-09-06 14:44 ` Borislav Petkov
2018-09-06 18:37 ` Brijesh Singh
2018-09-06 18:47 ` Sean Christopherson
2018-09-06 19:24 ` Brijesh Singh
2018-09-06 19:46 ` Brijesh Singh
2018-09-06 19:47 ` Sean Christopherson
2018-09-06 20:20 ` Brijesh Singh
2018-09-06 20:39 ` Sean Christopherson
2018-09-06 21:56 ` Brijesh Singh
2018-09-06 14:43 ` Borislav Petkov
2018-09-06 14:56 ` Sean Christopherson
2018-09-06 15:19 ` Borislav Petkov [this message]
2018-09-06 15:54 ` Sean Christopherson
2018-09-06 18:33 ` Borislav Petkov
2018-09-06 18:43 ` Brijesh Singh
2018-09-06 18:45 ` Sean Christopherson
2018-09-06 19:03 ` Borislav Petkov
2018-09-06 17:50 ` Brijesh Singh
2018-09-06 14:07 ` Sean Christopherson
2018-09-06 18:50 ` Brijesh Singh
2018-09-07 3:57 ` Brijesh Singh
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