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Thu, 2 Apr 2020 19:06:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585854415; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5nHVcHcfWe51+/F45Sy6N9CFUeM4/arakR0i0s8GPLo=; b=MLk1pIlvCRo9Ti5x9gPTeRWoxe0A6tdVAQErka2M6Hf+Ki9Gmh3XKLZXKQ1Rnb/CFQiuRU zdO1NY7UkKbnfj7p22wFxXJN3GXJAQLH3O/2gU2kmHBDzW7vsn5GY0UWyJc8FcTH+bXMAe NdAvnPkfwC8kgxyJiqcBSShIL98QQSc= X-MC-Unique: tRmVu9sEPqSjiFsQbK0i2Q-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 09/15] i386: hvf: Reset IRQ inhibition after moving RIP Date: Thu, 2 Apr 2020 15:06:34 -0400 Message-Id: <20200402190640.1693-10-pbonzini@redhat.com> In-Reply-To: <20200402190640.1693-1-pbonzini@redhat.com> References: <20200402190640.1693-1-pbonzini@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: Roman Bolshakov , Cameron Esfahani Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Roman Bolshakov The sequence of instructions exposes an issue: sti hlt Interrupts cannot be delivered to hvf after hlt instruction cpu because HF_INHIBIT_IRQ_MASK is set just before hlt is handled and never reset after moving instruction pointer beyond hlt. So, after hvf_vcpu_exec() returns, CPU thread gets locked up forever in qemu_wait_io_event() (cpu_thread_is_idle() evaluates inhibition flag and considers the CPU idle if the flag is set). Cc: Cameron Esfahani Signed-off-by: Roman Bolshakov Message-Id: <20200328174411.51491-1-r.bolshakov@yadro.com> Signed-off-by: Paolo Bonzini --- target/i386/hvf/vmx.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/target/i386/hvf/vmx.h b/target/i386/hvf/vmx.h index 03d2c79b9c..ce2a1532d5 100644 --- a/target/i386/hvf/vmx.h +++ b/target/i386/hvf/vmx.h @@ -167,6 +167,8 @@ static inline void macvm_set_cr4(hv_vcpuid_t vcpu, uint= 64_t cr4) =20 static inline void macvm_set_rip(CPUState *cpu, uint64_t rip) { + X86CPU *x86_cpu =3D X86_CPU(cpu); + CPUX86State *env =3D &x86_cpu->env; uint64_t val; =20 /* BUG, should take considering overlap.. */ @@ -176,6 +178,7 @@ static inline void macvm_set_rip(CPUState *cpu, uint64_= t rip) val =3D rvmcs(cpu->hvf_fd, VMCS_GUEST_INTERRUPTIBILITY); if (val & (VMCS_INTERRUPTIBILITY_STI_BLOCKING | VMCS_INTERRUPTIBILITY_MOVSS_BLOCKING)) { + env->hflags &=3D ~HF_INHIBIT_IRQ_MASK; wvmcs(cpu->hvf_fd, VMCS_GUEST_INTERRUPTIBILITY, val & ~(VMCS_INTERRUPTIBILITY_STI_BLOCKING | VMCS_INTERRUPTIBILITY_MOVSS_BLOCKING)); --=20 2.18.2