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From: Borislav Petkov <bp@alien8.de>
To: Michael Roth <michael.roth@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, linux-efi@vger.kernel.org,
	platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev,
	linux-mm@kvack.org, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Jim Mattson <jmattson@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Dov Murik <dovmurik@linux.ibm.com>,
	Tobin Feldman-Fitzthum <tobin@ibm.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Andi Kleen <ak@linux.intel.com>,
	"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
	tony.luck@intel.com, marcorr@google.com,
	sathyanarayanan.kuppuswamy@linux.intel.com
Subject: Re: [PATCH v6 08/42] x86/sev-es: initialize sev_status/features within #VC handler
Date: Thu, 21 Oct 2021 16:28:07 +0200	[thread overview]
Message-ID: <YXF4914AczWoN8TK@zn.tnic> (raw)
In-Reply-To: <20211021003535.ic35p6nnxdmavw35@amd.com>

On Wed, Oct 20, 2021 at 07:35:35PM -0500, Michael Roth wrote:
> Fortunately, all the code makes use of sev_status to get at the SEV MSR
> bits, so breaking the appropriate bits out of sme_enable() into an earlier
> sev_init() routine that's the exclusive writer of sev_status sounds like a
> promising approach.

Ack.

> It makes sense to do it immediately after the first #VC handler is set
> up, so CPUID is available, and since that's where SNP CPUID table
> initialization would need to happen if it's to be made available in
> #VC handler.

Right, and you can do all your init/CPUID prep there.

> It may even be similar enough between boot/compressed and run-time kernel
> that it could be a shared routine in sev-shared.c.

Uuh, bonus points! :-)

> But then again it also sounds like the appropriate place to move the
> snp_cpuid_init*() calls, and locating the cc_blob, and since there's
> differences there it might make sense to keep the boot/compressed and
> kernel proper sev_init() routines separate to avoid #ifdeffery).
>
> Not to get ahead of myself though. Just seems like a good starting point
> for how to consolidate the various users.

I like how you're thinking. :)

> Got it, and my apologies if I've given you that impression as it's
> certainly not my intent. (though I'm sure you've heard that before.)

Nothing to apologize - all good.

> Agreed, if we need to check SEV MSR early for the purposes of SNP it makes
> sense to move the overall SEV feature detection code earlier as well. I
> should have looked into that aspect more closely before introducing the
> changes.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette


  reply	other threads:[~2021-10-21 14:28 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-08 18:04 [PATCH v6 00/42] Add AMD Secure Nested Paging (SEV-SNP) Guest Support Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 01/42] x86/mm: Extend cc_attr to include AMD SEV-SNP Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 02/42] x86/sev: Shorten GHCB terminate macro names Brijesh Singh
2021-10-11 13:15   ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 03/42] x86/sev: Get rid of excessive use of defines Brijesh Singh
2021-10-11  8:48   ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 04/42] x86/head64: Carve out the guest encryption postprocessing into a helper Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 05/42] x86/sev: Define the Linux specific guest termination reasons Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 06/42] x86/sev: Save the negotiated GHCB version Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 07/42] x86/sev: Add support for hypervisor feature VMGEXIT Brijesh Singh
2021-10-13 14:02   ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 08/42] x86/sev-es: initialize sev_status/features within #VC handler Brijesh Singh
2021-10-18 14:29   ` Borislav Petkov
2021-10-18 18:40     ` Michael Roth
2021-10-18 19:18       ` Borislav Petkov
2021-10-20 16:10         ` Michael Roth
2021-10-20 18:01           ` Borislav Petkov
2021-10-21  0:35             ` Michael Roth
2021-10-21 14:28               ` Borislav Petkov [this message]
2021-10-20 18:08           ` Borislav Petkov
2021-10-21  2:05             ` Michael Roth
2021-10-21 14:39               ` Borislav Petkov
2021-10-21 23:00                 ` Michael Roth
2021-10-21 14:48           ` Borislav Petkov
2021-10-21 15:56             ` Dr. David Alan Gilbert
2021-10-21 16:55               ` Borislav Petkov
2021-10-21 17:12                 ` Dr. David Alan Gilbert
2021-10-21 17:37                   ` Borislav Petkov
2021-10-21 17:47                     ` Dr. David Alan Gilbert
2021-10-21 18:46                       ` Borislav Petkov
2021-10-21 21:34             ` Michael Roth
2021-10-21 14:51           ` Borislav Petkov
2021-10-21 20:41             ` Michael Roth
2021-10-25 11:04               ` Borislav Petkov
2021-10-25 16:35                 ` Michael Roth
2021-10-27 11:17                   ` Borislav Petkov
2021-10-27 15:13                     ` Michael Roth
2021-10-08 18:04 ` [PATCH v6 09/42] x86/sev: Check SEV-SNP features support Brijesh Singh
2021-10-19 14:47   ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 10/42] x86/sev: Add a helper for the PVALIDATE instruction Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 11/42] x86/sev: Check the vmpl level Brijesh Singh
2021-10-28 15:07   ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 12/42] x86/compressed: Add helper for validating pages in the decompression stage Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 13/42] x86/compressed: Register GHCB memory when SEV-SNP is active Brijesh Singh
2021-11-02 16:33   ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 14/42] x86/sev: " Brijesh Singh
2021-11-02 16:53   ` Borislav Petkov
2021-11-02 18:24     ` Brijesh Singh
2021-11-02 18:44       ` Borislav Petkov
2021-11-03 20:10         ` Brijesh Singh
2021-11-04 13:58           ` Borislav Petkov
2021-11-04 15:26             ` Brijesh Singh
2021-11-04 16:03               ` Boris Petkov
2021-10-08 18:04 ` [PATCH v6 15/42] x86/sev: Remove do_early_exception() forward declarations Brijesh Singh
2021-11-02 16:54   ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 16/42] x86/sev: Add helper for validating pages in early enc attribute changes Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 17/42] x86/kernel: Make the bss.decrypted section shared in RMP table Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 18/42] x86/kernel: Validate rom memory before accessing when SEV-SNP is active Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 19/42] x86/mm: Add support to validate memory when changing C-bit Brijesh Singh
2021-11-09 19:34   ` Borislav Petkov
2021-11-10 14:21     ` Brijesh Singh
2021-11-10 18:43       ` Borislav Petkov
2021-11-11 14:49         ` Tom Lendacky
2021-11-11 16:01           ` Borislav Petkov
2021-10-08 18:04 ` [PATCH v6 20/42] KVM: SVM: Define sev_features and vmpl field in the VMSA Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 21/42] KVM: SVM: Create a separate mapping for the SEV-ES save area Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 22/42] KVM: SVM: Create a separate mapping for the GHCB " Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 23/42] KVM: SVM: Update the SEV-ES save area mapping Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 24/42] x86/sev: Use SEV-SNP AP creation to start secondary CPUs Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 25/42] x86/head: re-enable stack protection for 32/64-bit builds Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 26/42] x86/sev: move MSR-based VMGEXITs for CPUID to helper Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 27/42] KVM: x86: move lookup of indexed CPUID leafs " Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 28/42] x86/compressed/acpi: move EFI system table lookup " Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 29/42] x86/compressed/acpi: move EFI config " Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 30/42] x86/compressed/acpi: move EFI vendor " Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 31/42] x86/boot: Add Confidential Computing type to setup_data Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 32/42] x86/compressed/64: add support for SEV-SNP CPUID table in #VC handlers Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 33/42] boot/compressed/64: use firmware-validated CPUID for SEV-SNP guests Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 34/42] x86/boot: add a pointer to Confidential Computing blob in bootparams Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 35/42] x86/compressed/64: store Confidential Computing blob address " Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 36/42] x86/compressed/64: add identity mapping for Confidential Computing blob Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 37/42] x86/sev: use firmware-validated CPUID for SEV-SNP guests Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 38/42] x86/sev: Provide support for SNP guest request NAEs Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 39/42] x86/sev: Register SNP guest request platform device Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 40/42] virt: Add SEV-SNP guest driver Brijesh Singh
2021-10-10 17:51   ` Dov Murik
2021-10-13 11:37     ` Brijesh Singh
2021-10-20 21:33   ` Peter Gonda
2021-10-27 16:07     ` Brijesh Singh
2021-10-27 20:10       ` Peter Gonda
2021-10-27 20:47         ` Brijesh Singh
2021-10-27 21:05           ` Peter Gonda
2021-10-27 21:12             ` Brijesh Singh
2021-10-27 21:15               ` Peter Gonda
2021-10-08 18:04 ` [PATCH v6 41/42] virt: sevguest: Add support to derive key Brijesh Singh
2021-10-08 18:04 ` [PATCH v6 42/42] virt: sevguest: Add support to get extended report Brijesh Singh

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