From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8518F15CAE for ; Tue, 8 Nov 2022 14:14:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07A7BC433D6; Tue, 8 Nov 2022 14:14:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667916892; bh=Kcm2xD3SzDwXU0YQvjuokruLH9nM2QlUZJTTHjPBrcY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=usi3yMS3oSUAmX+uA04O2Jr5tL9HvnLUT9j26qmTnUsfVJ3ALBpcoYVBjl+4mwU4t 8KGC/wL1iApOISnwNLJnvZyGIHhaUo8FHcq+LQH6LXzGgHYWP6nAJC8JHfghMHbF2+ OJAGiHEnAqZPUpLQ7aJJMQagEScFH0pHEdZQT8Y4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dave Hansen , "Kirill A. Shutemov" Subject: [PATCH 6.0 167/197] x86/tdx: Prepare for using "INFO" call for a second purpose Date: Tue, 8 Nov 2022 14:40:05 +0100 Message-Id: <20221108133402.525335354@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221108133354.787209461@linuxfoundation.org> References: <20221108133354.787209461@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Dave Hansen commit a6dd6f39008bb3ef7c73ef0a2acc2a4209555bd8 upstream. The TDG.VP.INFO TDCALL provides the guest with various details about the TDX system that the guest needs to run. Only one field is currently used: 'gpa_width' which tells the guest which PTE bits mark pages shared or private. A second field is now needed: the guest "TD attributes" to tell if virtualization exceptions are configured in a way that can harm the guest. Make the naming and calling convention more generic and discrete from the mask-centric one. Thanks to Sathya for the inspiration here, but there's no code, comments or changelogs left from where he started. Signed-off-by: Dave Hansen Acked-by: Kirill A. Shutemov Tested-by: Kirill A. Shutemov Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- arch/x86/coco/tdx/tdx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/arch/x86/coco/tdx/tdx.c +++ b/arch/x86/coco/tdx/tdx.c @@ -98,7 +98,7 @@ static inline void tdx_module_call(u64 f panic("TDCALL %lld failed (Buggy TDX module!)\n", fn); } -static u64 get_cc_mask(void) +static void tdx_parse_tdinfo(u64 *cc_mask) { struct tdx_module_output out; unsigned int gpa_width; @@ -121,7 +121,7 @@ static u64 get_cc_mask(void) * The highest bit of a guest physical address is the "sharing" bit. * Set it for shared pages and clear it for private pages. */ - return BIT_ULL(gpa_width - 1); + *cc_mask = BIT_ULL(gpa_width - 1); } /* @@ -758,7 +758,7 @@ void __init tdx_early_init(void) setup_force_cpu_cap(X86_FEATURE_TDX_GUEST); cc_set_vendor(CC_VENDOR_INTEL); - cc_mask = get_cc_mask(); + tdx_parse_tdinfo(&cc_mask); cc_set_mask(cc_mask); /*