From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34894) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1etvFz-0003dP-5O for qemu-devel@nongnu.org; Thu, 08 Mar 2018 08:06:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1etvFy-000602-3b for qemu-devel@nongnu.org; Thu, 08 Mar 2018 08:06:51 -0500 From: Peter Maydell Date: Thu, 8 Mar 2018 13:06:20 +0000 Message-Id: <20180308130626.12393-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PATCH v3 0/6] arm: support -cpu max (and gic-version=max) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: patches@linaro.org, Igor Mammedov , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Alex=20Benn=C3=A9e?= This patchset adds support for '-cpu max' to Arm, along the lines of the existing support we have for x86 targets: * under KVM, -cpu max is the same as -cpu host * under TCG, -cpu max means "emulate with as many features as possible" -cpu max is supported for both usermode and system emulation, again following the x86 line. NB that cross-QEMU-version migration is not supported for -cpu max: in future the definition of "maximum set of features" will change as we add more emulation features. The patchset also adds support to the virt board for the "max" option to -machine gic-version, requesting "best available interrupt controller", with the same semantics as -cpu max. Together these should assist users like libguestfs that just want to be able to run code without having to figure out what the right command line arguments for this particular host system are. The patches make 'any' a synonym for 'max', using the approach of putting a compat hack into arm_cpu_class_by_name() that Igor suggested. For the moment, we don't enable any of the CPU feature bits in 'max' that aren't in the a15/a57 if we're doing system emulation mode. This is a combination of: * some of those bits are currently only implemented sufficiently for user-only mode, not for system emulation * we would also need to update ID register bits to advertise the extra features We should certainly do that, but I'd like to get basic -cpu max support into 2.12, and the softfreeze deadline is rapidly approaching, so I've opted to postpone that to post 2.12. If people have the time to review this series this week I'd really appreciate it. Changes since v1: * the "check CPU realize succeeded in virt board" patch is in master * the "target/arm: Make 'any' CPU just an alias for 'max'" is new, and unifies 'any' with 'max' as suggested in review of v1 * the other patches are essentially unchanged Changes since v2: * fixed the silly error in patch 4 that made user-only mode always use "max" rather than only if the user asked for "any"... thanks -- PMM Peter Maydell (6): target/arm: Query host CPU features on-demand at instance init target/arm: Move definition of 'host' cpu type into cpu.c target/arm: Add "-cpu max" support target/arm: Make 'any' CPU just an alias for 'max' hw/arm/virt: Add "max" to the list of CPU types "virt" supports hw/arm/virt: Support -machine gic-version=max target/arm/cpu-qom.h | 2 ++ target/arm/cpu.h | 5 +++ target/arm/kvm_arm.h | 35 +++++++++++++------ hw/arm/virt.c | 30 ++++++++++------ target/arm/cpu.c | 97 +++++++++++++++++++++++++++++++++++++++++++--------- target/arm/cpu64.c | 66 ++++++++++++++++++++++------------- target/arm/kvm.c | 53 ++++++++++------------------ target/arm/kvm32.c | 8 ++--- target/arm/kvm64.c | 8 ++--- 9 files changed, 200 insertions(+), 104 deletions(-) -- 2.16.2