linux-kernel - Re: [PATCH 22/25] KVM: TDX: Use guest physical address to configure EPT level and GPAW

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7ba0756f-3a7f-4aed-b0d1-d47c1d4cbd5b@redhat.com>
Date: Tue, 10 Sep 2024 19:31:16 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>, seanjc@...gle.com,
 kvm@...r.kernel.org
Cc: kai.huang@...el.com, isaku.yamahata@...il.com,
 tony.lindgren@...ux.intel.com, xiaoyao.li@...el.com,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 22/25] KVM: TDX: Use guest physical address to configure
 EPT level and GPAW

On 8/13/24 00:48, Rick Edgecombe wrote:
> @@ -576,6 +575,9 @@ static int setup_tdparams_cpuids(struct kvm_cpuid2 *cpuid,
>   		value->ebx = entry->ebx;
>   		value->ecx = entry->ecx;
>   		value->edx = entry->edx;
> +
> +		if (c->leaf == 0x80000008)
> +			value->eax &= 0xff00ffff;
>   	}
>   
>   	return 0;

Ah, this answers my question in 21/25.  It definitely needs a comment 
though!  Also to explain what will future support in the TDX module look 
like (a new feature bit I guess).

Paolo