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Wed, 24 Jun 2020 19:01:02 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id C834D4C8A5; Wed, 24 Jun 2020 23:00:58 +0000 (UTC) Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mShg5_6uawVf; Thu, 25 Jun 2020 02:00:56 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 48D334C8A8; Thu, 25 Jun 2020 02:00:56 +0300 (MSK) Received: from localhost (172.17.204.212) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Thu, 25 Jun 2020 02:00:56 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1593039656; x=1594854057; bh=oeWDG+WWzJ1ddsNbdkQSnBzk7CCguEOTiGP 81HTc41Y=; b=Xwf9qjNIRZOlojOtE4pFELU6gZrQRyl6kxUq3a9c0WL591g7Vbe 2NywKILBe+YAM4FpHhBDkJ0jI9ECx4RPYurlKicHD3oFL/OIcZnxWXm8vGYbyPot CSmROhr9aevHwJVJ29s+Ip9a8Ney9TC4mogjhPPJ7eX+gNJ5t2drBTzo= X-Virus-Scanned: amavisd-new at yadro.com From: Roman Bolshakov To: Subject: [PATCH 1/8] i386: hvf: Set env->eip in macvm_set_rip() Date: Thu, 25 Jun 2020 01:58:44 +0300 Message-ID: <20200624225850.16982-2-r.bolshakov@yadro.com> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200624225850.16982-1-r.bolshakov@yadro.com> References: <20200624225850.16982-1-r.bolshakov@yadro.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [172.17.204.212] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=89.207.88.252; envelope-from=r.bolshakov@yadro.com; helo=mta-01.yadro.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/24 19:00:57 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , Cameron Esfahani , Roman Bolshakov , Claudio Fontana , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @yadro.com) Content-Type: text/plain; charset="utf-8" cpu_synchronize_state() is currently no-op for hvf but BIOS will hang in vAPIC option ROM when cpu_synchronize_state() is wired to hvf_cpu_synchronize_state(). cpu_synchronize_state() state is called from vapic_write() during option ROM initialization. It sets dirty flag on the cpu. macvm_set_rip() is then invoked to advance IP after the I/O write to vAPIC port. macvm_set_rip() only modifies VMCS, it doesn't change env->eip. Therefore on the next iteration of vCPU loop, vcpu_dirty flag is checked and hvf_put_registers() overwrites correct RIP in VMCS with the value of env->eip that points to the I/O write instruction. Execution of the CPU gets stuck on the instruction. The issue can be avoided if eip doesn't contain stale value when dirty flag is set on cpu. Cc: Cameron Esfahani Signed-off-by: Roman Bolshakov --- target/i386/hvf/vmx.h | 1 + 1 file changed, 1 insertion(+) diff --git a/target/i386/hvf/vmx.h b/target/i386/hvf/vmx.h index ce2a1532d5..1e8b29bf7d 100644 --- a/target/i386/hvf/vmx.h +++ b/target/i386/hvf/vmx.h @@ -173,6 +173,7 @@ static inline void macvm_set_rip(CPUState *cpu, uint64_= t rip) =20 /* BUG, should take considering overlap.. */ wreg(cpu->hvf_fd, HV_X86_RIP, rip); + env->eip =3D rip; =20 /* after moving forward in rip, we need to clean INTERRUPTABILITY */ val =3D rvmcs(cpu->hvf_fd, VMCS_GUEST_INTERRUPTIBILITY); --=20 2.26.1