Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Thomas Gleixner <tglx@linutronix.de>
To:     "Kirill A. Shutemov" <kirill@shutemov.name>
Cc:     LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        David Woodhouse <dwmw2@infradead.org>,
        Andrew Cooper <andrew.cooper3@citrix.com>,
        Brian Gerst <brgerst@gmail.com>,
        Arjan van de Veen <arjan@linux.intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Paul McKenney <paulmck@kernel.org>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Sean Christopherson <seanjc@google.com>,
        Oleksandr Natalenko <oleksandr@natalenko.name>,
        Paul Menzel <pmenzel@molgen.mpg.de>,
        "Guilherme G. Piccoli" <gpiccoli@igalia.com>,
        Piotr Gorski <lucjan.lucjanov@gmail.com>,
        Usama Arif <usama.arif@bytedance.com>,
        Juergen Gross <jgross@suse.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        xen-devel@lists.xenproject.org,
        Russell King <linux@armlinux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>,
        linux-arm-kernel@lists.infradead.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Guo Ren <guoren@kernel.org>,
        linux-csky@vger.kernel.org,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        linux-mips@vger.kernel.org,
        "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
        Helge Deller <deller@gmx.de>, linux-parisc@vger.kernel.org,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        linux-riscv@lists.infradead.org,
        Mark Rutland <mark.rutland@arm.com>,
        Sabin Rapan <sabrapan@amazon.com>,
        "Michael Kelley (LINUX)" <mikelley@microsoft.com>,
        Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [patch v3 31/36] x86/apic: Provide cpu_primary_thread mask
In-Reply-To: <20230529203129.sthnhzgds7ynddxd@box.shutemov.name>
References: <20230508181633.089804905@linutronix.de>
 <20230508185218.962208640@linutronix.de>
 <20230524204818.3tjlwah2euncxzmh@box.shutemov.name> <87y1lbl7r6.ffs@tglx>
 <87sfbhlwp9.ffs@tglx> <20230529023939.mc2akptpxcg3eh2f@box.shutemov.name>
 <87bki3kkfi.ffs@tglx> <20230529203129.sthnhzgds7ynddxd@box.shutemov.name>
Date:   Tue, 30 May 2023 11:26:03 +0200
Message-ID: <87pm6ijhlg.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

On Mon, May 29 2023 at 23:31, Kirill A. Shutemov wrote:
> Aaand the next patch that breaks TDX boot is... <drum roll>
>
> 	x86/smpboot/64: Implement arch_cpuhp_init_parallel_bringup() and enable it
>
> Disabling parallel bringup helps. I didn't look closer yet. If you have
> an idea let me know.

So how does TDX end up with actual parallel bringup?

	if (cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) {
		pr_info("Parallel CPU startup disabled due to guest state encryption\n");
		return false;
	}

It should take that path, no?

Thanks,

        tglx