From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 815E67260F for ; Fri, 12 Jun 2026 23:01:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781305279; cv=none; b=oIblpA91dqqaHuA2vjrujuSyxydZSEsBPyFmZJxrtW/Op2JeR1Qif7av7GoRUGkvSQpF4l78TVBh0kvDNUYHJpTw9p3Vj/0neHfQmb7qAYlOs4eGe6uvgBijpHIpF3sDsyYGS2brODZ3W1ccjGP4KlRyRD2C17w04wJf/ibAkR4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781305279; c=relaxed/simple; bh=5T3lFHzG4vHWWZUkIh/IujOLCVxo/GayI1T5Pa4LwYk=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=H4tHEa05maUVw64wH4UvZdQKqCJ/+hh9GVMXFA3dUgamXl2FHJzPuK81fLoBu20HBEok3sf8Bfnh2Gg3Fz8C0cTxIF8uYO5HWxNEd6Ux4uHiJvXgVav+izi7z7Zj1mzN/DvbkDNrB+SvdIcInFbcZn8mW7wsJwugdI4d/aP6zOY= 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=p88wkZ9d; arc=none smtp.client-ip=209.85.215.202 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="p88wkZ9d" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-c85a2c305d0so721119a12.1 for ; Fri, 12 Jun 2026 16:01:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781305277; x=1781910077; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:from:subject:message-id :mime-version:date:reply-to:from:to:cc:subject:date:message-id :reply-to; bh=1J7obFawRf3HSMfap2O0RxTpizypIrwgc7yPCSjiETc=; b=p88wkZ9d2ele2MizXMRlMEGJXBO4HdSLdrCVtVHv3YsUtJV+27X57pNh4meijrECx0 K1BbGFjjh+OmEeXynwKEJJg4GZn/1R2Bi2/RrmnO5C1Lq+oK+STOjM+9YPhPB9WK9ypx YMfTPEBmbh/gXRhbFrlH2nLyvRkxS3GPHiyqghppHe8UEtmkTwI/gIXk+QSKjgUKyqo7 Qsl5R+R3goJCbjLle22lFO9jovbazfYoLdYyeD4SW+4u40sqpp3Bq7qLH8RHpQA686AV 9gQm01GCr8S3RLDvC4E2yz8eLilB55B7mzun/0Y3rfUnpbrLgPPwV4DFvYt9aaj3yeij 25rQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781305277; x=1781910077; h=content-transfer-encoding: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=1J7obFawRf3HSMfap2O0RxTpizypIrwgc7yPCSjiETc=; b=PaehX956ncO2vxf+mjEiSd+jw/9Z9fw1Xmj2XwJaqd9Q2tz8mHmV+45lz04JW5xWc9 jzvY9dGVFZvGg5zbKQAhs+SG6J0t49O9Vc54DaArTcEbOfYypwGcumxnvkgHaqZqlxLC i00hsawxkJiQQnURyCWMR2umyXgdWT3ANACzVli6KTMy8YAMqOwQ3Rc7th7NL7cujNLN LCt1AI03wsa4x/j/aGfVoS3s9S0KnR7IZF6vHuntlanXxHyFwm9jAikEMrcN1hTSOHty C8/5erUgw9x2j/RtEcUjMFVLPCZv7FWruLh3M/FP383Qe1RrYFkLOR8mGBLOprw7l8XQ YJcA== X-Forwarded-Encrypted: i=1; AFNElJ/hkVvq2AsOs1lygYBeNAk7ojl1ZGQ42qWH2S2Rerk/o2hpqwnlXLx9jnz0eojajD1OFPa9iPy2HTEXi8E=@vger.kernel.org X-Gm-Message-State: AOJu0YyOvCYO3BVJHmmObzxXi/dbrSD+TltPvOeC6yL6q1Asnz7zqThq RBdyn00OQ6T8ae5+/gcf+4yxA+br322V+WDHpqrcOr9NHUure19Mc4fiOZWrCkstz5U63iU5QtR xZts/PA== X-Received: from pgwb7.prod.google.com ([2002:a65:6687:0:b0:c79:39f0:12f2]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:6d8f:b0:3b4:6cae:4a51 with SMTP id adf61e73a8af0-3b783b5ffdcmr5394175637.11.1781305276624; Fri, 12 Jun 2026 16:01:16 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 12 Jun 2026 16:01:05 -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 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260612230113.684301-1-seanjc@google.com> Subject: [PATCH v3 0/8] KVM: x86: Fix emulated MOV DR{4,5} #GP bugs From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, "=?UTF-8?q?Carlos=20L=C3=B3pez?=" , "Maciej W . Rozycki" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Carlos' fix for a bug where KVM fails to signal #GP on emulated MOV DR to DR4 or DR5, plus a pile of follow-up fixes priority goofs (#UD versus #GP, #GP vs #DB, and #GP versus #VMEXIT on SVM). The rest are opportunistic cleanups. v3: - Fix a #UD vs #GP due to CPL>0 bug. - Prioritize DR7.GD=3D1 #DB over CPL>0 #GP on Intel. v2: https://lore.kernel.org/all/20260603230718.1733483-1-seanjc@google.com v1: https://lore.kernel.org/all/20260601133320.91479-2-clopez@suse.de Carlos L=C3=B3pez (1): KVM: x86: Treat any non-zero return from set_dr() as a faulting condition Sean Christopherson (7): KVM: x86: Prioritize DR7.GD #DB over #GP due to illegal DR6/7 value KVM: x86: Manually check DR4/5 write values to fix SVM intercept priority KVM: x86: Prioritize #UD on MOV DR over #GP due to non-zero CPL KVM: VMX: Prioritize DR7.GD=3D1 #DB over CPL>0 #GP on Intel KVM: x86: Use kvm_dr{6,7}_valid() to check DR{4,5,6,7} write values in emulator KVM: x86: WARN if MOV DR emulation hits a "too late" #GP KVM: x86: Read CR4.DE in emulator if and only if accessing DR4 or DR5 arch/x86/kvm/emulate.c | 49 +++++++++++++++++++++++++++++++----------- arch/x86/kvm/vmx/vmx.c | 6 +++--- 2 files changed, 40 insertions(+), 15 deletions(-) base-commit: c1f7303302927f9cbf4efedf70f0512cde168c65 --=20 2.54.0.1136.gdb2ca164c4-goog