From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) (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 BDC757602D for ; Fri, 2 Aug 2024 20:29:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722630586; cv=none; b=aFgdjRgNk+8WLc4qhJWnSwRPCRgmjpCVJt+KBtQLVZAnVOpj92fGstiNbnSzALuagTBcVdrKJNWxIqYBbBmnHqOu5eixbeBFhdHXV0ZJgmwOGROm4CbAyDTw6o6hG5vrwa0PEp7vyS3BD3lKBbwnr6qjRv2eKHer5mAISyvW7gk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722630586; c=relaxed/simple; bh=l2pw4PqSYTqENlQeojQEIlKcrxUVCty1cPi4OYAbveA=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=dkQFxjX3RG8gDUymaP6yLhTRfq6Cv6Hyzb8lN5IDxzWsKJ4nV/NQkDkCQ+wRNWXpwBOg+1BtqFSKX2ojW4rgbKKMKPi1ORboNlwdo9EfbK7bno0QaGQU66pbkGts9T4dRmsFl6MqcNTDr3TcTrG/GhVTPrNL1EEBAMuIkPNKUOU= 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=rC8AP7hD; arc=none smtp.client-ip=209.85.219.201 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="rC8AP7hD" Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-e0bd2d4cea6so3393775276.3 for ; Fri, 02 Aug 2024 13:29:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1722630584; x=1723235384; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:reply-to:from:to:cc :subject:date:message-id:reply-to; bh=OpWX4VZCbnXKP6XhT+I6JbMrTYPhaOiN05VsWUmHsfs=; b=rC8AP7hD+o2iSJ0uU8ZgNHScyu0RVA9Z2FwHRlh8bSiGePRgJfRDf/+xVXy6LFEetx jNn2TtIw+Cmwz2xQKeJQGxMnlA95O7tuCdNhKWTfTdUdsXtu14hmMWwdjDpAk61qPdW0 jKVzz7bxkwMfzehgsUKj0ronf7qfBs/pz26F+30cjXYj/u+9CCMTfLWuBqYu16c4G99D FRxUBzLNlG831h3cJvL6fH2KZpaX43mPrMSaAwGH9OAVeXlStRJp/3q7P2aSuj7Zjrk0 FpPr61J8f8hZB5pf/0UAlf8aP5lKK1ROqKphk9HSugxyY0G6Ms+2M4klnKBdgwOcNqnW cH5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722630584; x=1723235384; h=cc:to:from:subject:message-id:mime-version:date:reply-to :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=OpWX4VZCbnXKP6XhT+I6JbMrTYPhaOiN05VsWUmHsfs=; b=Jk2aPzh/0qWM/6mkRjfFCZnNu6Hz4sKO2bC8DIFY97gweOkHfc3ANZ+P4Oj41rwP9V Sd/pBJzXTdGgW6a1GH4o1gNHx0wEZHi3j39WtXBwZ5VYvyFm2CLcTYk5grv+kCw4ar0O flX+vtwSLEvjiGoINNqWyE/kC4IFNfu4ITOC3I3v02sc6rCRGfwLl5o3M5lTyHDWXikM 6iNxIkW/lDY3U6Bkfkm+eQo3i32/drfW3DYu4Frrqu2f5PiB0wZ7nW9j99iWkPkM1iZP uwar9bkYI+Bzq57AKr5Zv1/ZFBTxdfqOnzhYispFllL0Iep5o3PREPqYDRzkbdYwvaBA oP3Q== X-Forwarded-Encrypted: i=1; AJvYcCV7SmwRKyS440Uvji7QwXfWfdChyZ0xkKGFYO294iSV4LWzG2Ey32U3enlpk9WxCJG4bY1szhFknbhVEOunwTWMdKP7b1TZkiWtqhR1 X-Gm-Message-State: AOJu0YwEB7VPrOUQr6OsPvQuk4PTy7G07Gw7eIPOg19adddrl+sNIlrq MfdJW6Ahq9uVRw4pI4mNvemdoQyXirH8pU9cSDB2lEImxmHNA31nQW180oqlZ80CFrvSs9drnc6 jhw== X-Google-Smtp-Source: AGHT+IGgFlKdqMHR7BL18rAEWzUIwmbuzm/DOyuEivSn1SzJj5+EN1uFdD7r0ZBjP/F0caZ+UNRhm2lPg9o= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6902:2b84:b0:e0b:bafe:a7ff with SMTP id 3f1490d57ef6-e0bde264493mr8422276.6.1722630583760; Fri, 02 Aug 2024 13:29:43 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 2 Aug 2024 13:29:39 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.46.0.rc2.264.g509ed76dc8-goog Message-ID: <20240802202941.344889-1-seanjc@google.com> Subject: [PATCH 0/2] KVM: x86: Disallow changing x2APIC ID via userspace From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Michal Luczaj , Haoyu Wu , syzbot+545f1326f405db4e1c3e@syzkaller.appspotmail.com Content-Type: text/plain; charset="UTF-8" Silently ignore userspace attempts to change the x2APIC ID via KVM_SET_LAPIC. I've been hunting for this series since January[*], and *finally* stumbled across it while tidying up my (too) many git trees. [*] https://lore.kernel.org/all/ZbPkHvuJv0EdJhVN@google.com Michal Luczaj (1): KVM: selftests: Add a testcase to verify x2APIC is fully readonly Sean Christopherson (1): KVM: x86: Make x2APIC ID 100% readonly arch/x86/kvm/lapic.c | 18 +++++++++--- .../selftests/kvm/x86_64/xapic_state_test.c | 28 +++++++++++++++++++ 2 files changed, 42 insertions(+), 4 deletions(-) base-commit: 332d2c1d713e232e163386c35a3ba0c1b90df83f -- 2.46.0.rc2.264.g509ed76dc8-goog