From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6091F3101B2 for ; Thu, 13 Nov 2025 18:52:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763059926; cv=none; b=ppffdnmkiZUF5ZUhLS2xzBOkgoK9R9ugsOCn6D12wJIm4LIrANNPdWC0sxBFPo6gQ4xzPXSXhceOH88emBk2cKZEGq1vTrGAuW6PF04ye705lhDUutRWChFfLbP+KJm/cjRzjl9zsirqzoF/xD7xJUpjideDBg5H+havemHJY4w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763059926; c=relaxed/simple; bh=1I81ZMh2flMGmGHT9awFaIU8CTiz5EtPfzZ60BaJIQg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=eU7GvzYZtW6r68GIMzfTJ3eg7dmtBjQCtVU5QAgi5xccobSx3BoWL+Bqn1jMGW7IR99NgqKm4Fv8gsmhQ7aUSH0ICw1TfzwchLJ1SH02P1rO1r37PdpOH/LXMCwE8nGikbRJi0E2nF6svrC6NgkFsD3G5i6AUXjtXatbRdeHLG4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=rGYOArWL; arc=none smtp.client-ip=209.85.214.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="rGYOArWL" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2982b47ce35so13173535ad.2 for ; Thu, 13 Nov 2025 10:52:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1763059925; x=1763664725; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=cIVgrZy+vZcCrxI7QYJ8hXcnFmjFjPoiu79u6DzwfMA=; b=rGYOArWLBoU/z7s2/0AFUplNEZJlfgGZoFD0CPngpcrsVtURCpOHU5T8W1uWSDnD72 i3QCs2ESzUzudtmienyD0J/nc2O1Hr2cBHB8R/hFhTOKyDmFrcJz4uT5vPE0DXjGAXSB wREraRFWzCZDCHB+BPFQ4rFo/+DXMm8tsocoX0sGhLP417QhH+NWf2oY46zCW2m7HX5C tLqjkfLLECu3yBngKAbDa5img1EVRvDarrs64s5HBy+qaqWDDv7hNdTDBAzmDOwJ8c4z zWp3HwaXx0wecl8fQRwf8zp0yjLf3nRFP4hOjSCUfXD+C5wvSD+gx6itbQTBKAnirHdH kcGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763059925; x=1763664725; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=cIVgrZy+vZcCrxI7QYJ8hXcnFmjFjPoiu79u6DzwfMA=; b=ezr4w978Bpsuzb1N85t2iQVA93SJEznllreUIlsVeZXok02O/HW5SqeL5tGtqEypOz BOOa2pC/3N9aLrXGqcHWahrMnrdp8pLD9lhL2hFFXCCnyf6Ch5QcrkzAO/oEr9JTZiKV OqVTsh1TWXgqpPkQkjNIu9yNsgmGPxnPK9I1UsBE81ikzJNQDwmSwyh5z3pya++2sPk4 RukTFVDC3jCn5NzAuRgN65kiZqSouohpTb1IxHX4PMPbIBbHQs/c+AciB5jIafjTIdn4 gEahUNk4V8NolgiI3jVN9EBBEYCdMMXUOZBWQwx5754CWL3okDsu2QHx/b001HmlgPAN 4/VA== X-Forwarded-Encrypted: i=1; AJvYcCUTkWZavJlcXIwnqyOUO6VV8FkCFSGcA+RXqtkRwmB8BfE6SSFDK5NQktI+r7c/nXvVRbOmYZML+OSxwNk=@vger.kernel.org X-Gm-Message-State: AOJu0Yyi2Zup1IFrKBSkcoQVFaAkZdafGOM8TFvoPY66/JCLSYcHCQvA NOLPaeKXFzQZR07IDjxMmP0BBeOo5uF2uddYMzhX4eL3AgS7rLJnDq6d19L14yDNO8PgTRXjHuc 6/rS8Wg== X-Google-Smtp-Source: AGHT+IELLdvnYt/gi3DBJs5U+itYxHk4SoCPsQR2iLQbi7s7Ha6OS3ZSPCJ4OFt28AA30gan8pj0zZ6ieKk= X-Received: from plbkp5.prod.google.com ([2002:a17:903:2805:b0:297:fd8b:fe1e]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:ecc7:b0:297:db6a:a82f with SMTP id d9443c01a7336-2986a6d27fcmr422445ad.24.1763059924664; Thu, 13 Nov 2025 10:52:04 -0800 (PST) Date: Thu, 13 Nov 2025 10:52:03 -0800 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: Message-ID: Subject: Re: [PATCH v4 2/4] crypto: ccp - Add an API to return the supported SEV-SNP policy bits From: Sean Christopherson To: Tom Lendacky Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-crypto@vger.kernel.org, Paolo Bonzini , Borislav Petkov , Dave Hansen , Ingo Molnar , Thomas Gleixner , Michael Roth , Ashish Kalra , Herbert Xu , David Miller Content-Type: text/plain; charset="us-ascii" On Mon, Oct 27, 2025, Tom Lendacky wrote: > Supported policy bits are dependent on the level of SEV firmware that is > currently running. Create an API to return the supported policy bits for > the current level of firmware. > > Signed-off-by: Tom Lendacky > --- ... > @@ -1014,6 +1031,7 @@ void *snp_alloc_firmware_page(gfp_t mask); > void snp_free_firmware_page(void *addr); > void sev_platform_shutdown(void); > bool sev_is_snp_ciphertext_hiding_supported(void); > +u64 sev_get_snp_policy_bits(void); > > #else /* !CONFIG_CRYPTO_DEV_SP_PSP */ > > @@ -1052,6 +1070,8 @@ static inline void sev_platform_shutdown(void) { } > > static inline bool sev_is_snp_ciphertext_hiding_supported(void) { return false; } > > +static inline u64 sev_get_snp_policy_bits(void) { return 0; } As called out in the RFC[*], this stub is unnecesary. [*] https://lore.kernel.org/all/aMHP5EO-ucJGdHXz@google.com