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c=relaxed/relaxed; d=alien8.de; s=dkim; t=1598895023; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=NdaGU+Hkbaybz0GoT3aHi/t/rgpmP7RP+3/Ipunfh/s=; b=SOAc1nvrUv0yGPmWnySfFR0uzO5RbSckRMdNlvPmn1cdv1ZopXZOW0MyVLNbsVS9+SRuF+ k9HZkAUK1eDERF9CLBEUW8pC9MIKsTgAPgA+HnghQ8Pcc3wvNuGXCQ/ik4+hD7oRG1a9nF sKuNteWGs2emV5F6vs97T6ZZj0FlPi4= Date: Mon, 31 Aug 2020 19:30:24 +0200 From: Borislav Petkov To: Joerg Roedel Subject: Re: [PATCH v6 48/76] x86/entry/64: Add entry code for #VC handler Message-ID: <20200831173024.GN27517@zn.tnic> References: <20200824085511.7553-1-joro@8bytes.org> <20200824085511.7553-49-joro@8bytes.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200824085511.7553-49-joro@8bytes.org> Cc: Juergen Gross , Tom Lendacky , Dave Hansen , Mike Stunes , Kees Cook , kvm@vger.kernel.org, Peter Zijlstra , Cfir Cohen , x86@kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson , virtualization@lists.linux-foundation.org, Martin Radev , Joerg Roedel , Masami Hiramatsu , Andy Lutomirski , hpa@zytor.com, Erdem Aktas , David Rientjes , Dan Williams , Jiri Slaby X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Mon, Aug 24, 2020 at 10:54:43AM +0200, Joerg Roedel wrote: > @@ -674,6 +675,56 @@ asmlinkage __visible noinstr struct pt_regs *sync_regs(struct pt_regs *eregs) > return regs; > } > > +#ifdef CONFIG_AMD_MEM_ENCRYPT > +asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *eregs) > +{ > + unsigned long sp, *stack; > + struct stack_info info; > + struct pt_regs *regs; > + > + /* > + * In the SYSCALL entry path the RSP value comes from user-space - don't > + * trust it and switch to the current kernel stack > + */ > + if (eregs->ip >= (unsigned long)entry_SYSCALL_64 && > + eregs->ip < (unsigned long)entry_SYSCALL_64_safe_stack) { > + sp = this_cpu_read(cpu_current_top_of_stack); > + goto sync; > + } > + > + /* > + * From here on the the RSP value is trusted - more RSP sanity checks ^^^^^^^ Fished out one valid warning from the confused blabla checkpatch spits out: WARNING: Possible repeated word: 'the' #276: FILE: arch/x86/kernel/traps.c:696: + * From here on the the RSP value is trusted - more RSP sanity checks IOW, as I tell other submitters: Please integrate scripts/checkpatch.pl into your patch creation workflow. Some of the warnings/errors *actually* make sense. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization