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Thu, 2 Apr 2020 14:54:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585839270; 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; bh=pAWLrBkCg471xZMC4vYlRsSQX3KPz345VQNtx7UC/ns=; b=H+WeZ85uNQW6AKdpNSAMBmbJABA9XDtQfw6CdMrCStTWHE/MJua0vAX04mYTGctKXPHT22 BEgDo+l6SwYeAcyQ18l3ltene5gBZXaiK7K6FBHHoC/a6pfzKVmnaQAtQs+vxr0BIBruOT NE1NdHWAO06NbCdEvJ4YDq97nUTWexM= X-MC-Unique: H4YGWISwPP2iFwxJrcAaNg-1 From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH for-5.0 v2] xen: fixup RAM memory region initialization Date: Thu, 2 Apr 2020 10:54:18 -0400 Message-Id: <20200402145418.5139-1-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 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: 207.211.31.81 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: peter.maydell@linaro.org, ehabkost@redhat.com, mst@redhat.com, anthony.perard@citrix.com, pbonzini@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Since bd457782b3b0 ("x86/pc: use memdev for RAM") Xen machine fails to start with: qemu-system-i386: xen: failed to populate ram at 0 The reason is that xen_ram_alloc() which is called by memory_region_init_ram(), compares memory region with statically allocated 'global' ram_memory memory region that it uses for RAM, and does nothing in case it matches. While it's possible feed machine->ram to xen_ram_alloc() in the same manner to keep that hack working, I'd prefer not to keep that circular dependency and try to untangle that. However it doesn't look trivial to fix, so as temporary fixup opt out Xen machine from memdev based RAM allocation, and let xen_ram_alloc() do its trick for now. Reported-by: Anthony PERARD Signed-off-by: Igor Mammedov --- v2: * make it work with -M pc,accel=3Dxen --- hw/xen/xen-common.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/xen/xen-common.c b/hw/xen/xen-common.c index 15650d7f6a..a15070f7f6 100644 --- a/hw/xen/xen-common.c +++ b/hw/xen/xen-common.c @@ -19,6 +19,7 @@ #include "sysemu/runstate.h" #include "migration/misc.h" #include "migration/global_state.h" +#include "hw/boards.h" =20 //#define DEBUG_XEN =20 @@ -151,6 +152,8 @@ static void xen_setup_post(MachineState *ms, AccelState= *accel) =20 static int xen_init(MachineState *ms) { + MachineClass *mc =3D MACHINE_GET_CLASS(ms); + xen_xc =3D xc_interface_open(0, 0, 0); if (xen_xc =3D=3D NULL) { xen_pv_printf(NULL, 0, "can't open xen interface\n"); @@ -170,6 +173,10 @@ static int xen_init(MachineState *ms) return -1; } qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); + /* + * opt out of system RAM being allocated by generic code + */ + mc->default_ram_id =3D NULL; return 0; } =20 --=20 2.18.1