From patchwork Wed Nov 15 07:14:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiaoyao Li X-Patchwork-Id: 13456239 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 084703D9F for ; Wed, 15 Nov 2023 07:16:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="n5rgZ8v3" Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E14F0EB for ; Tue, 14 Nov 2023 23:16:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700032586; x=1731568586; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5oFP29/6hPQTSjt7+TkWWvWCU+lwZOG63ox2Xe0ioV4=; b=n5rgZ8v3k9d5tfks1M6gtIt3Oct+yfCT1YWYAj3x6j8gOARz0OfWu1IY 23AatTsbCVlloWDhk2n+MPrFRQ6S/BGNGONkMP3AdYtU+N3r2Q8PoiKZX M+GHr4+wqqq/fjNvHmOiOjUKfSnigumDPSpNs48BZF8Duu2m6ROnZnOcp kZ/6ymxd/1xOdAykgzBXQnxDt4sksP45L/QRvqbHxaXeqsE8uLtfrJVgt XVvTbC+vZv5W92RNxUC/1xgU9p29zDrpDDq1JMUl4ntkk79PtQB+l443d zIKK7pJwKoojLWB2IgW36kxvqwR91ltDzXPxjhK4naAu9OIzepMV7ymaO g==; X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="390622170" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="390622170" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Nov 2023 23:16:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="714796990" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="714796990" Received: from lxy-clx-4s.sh.intel.com ([10.239.48.52]) by orsmga003.jf.intel.com with ESMTP; 14 Nov 2023 23:16:08 -0800 From: Xiaoyao Li To: Paolo Bonzini , David Hildenbrand , Igor Mammedov , "Michael S . Tsirkin" , Marcel Apfelbaum , Richard Henderson , Peter Xu , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Cornelia Huck , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Eric Blake , Markus Armbruster , Marcelo Tosatti Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, xiaoyao.li@intel.com, Michael Roth , Sean Christopherson , Claudio Fontana , Gerd Hoffmann , Isaku Yamahata , Chenyi Qiang Subject: [PATCH v3 06/70] kvm: Introduce support for memory_attributes Date: Wed, 15 Nov 2023 02:14:15 -0500 Message-Id: <20231115071519.2864957-7-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231115071519.2864957-1-xiaoyao.li@intel.com> References: <20231115071519.2864957-1-xiaoyao.li@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Introduce the helper functions to set the attributes of a range of memory to private or shared. This is necessary to notify KVM the private/shared attribute of each gpa range. KVM needs the information to decide the GPA needs to be mapped at hva-based shared memory or guest_memfd based private memory. Signed-off-by: Xiaoyao Li --- accel/kvm/kvm-all.c | 42 ++++++++++++++++++++++++++++++++++++++++++ include/sysemu/kvm.h | 3 +++ 2 files changed, 45 insertions(+) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 69afeb47c9c0..76e2404d54d2 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -102,6 +102,7 @@ bool kvm_has_guest_debug; static int kvm_sstep_flags; static bool kvm_immediate_exit; static bool kvm_guest_memfd_supported; +static uint64_t kvm_supported_memory_attributes; static hwaddr kvm_max_slot_size = ~0; static const KVMCapabilityInfo kvm_required_capabilites[] = { @@ -1305,6 +1306,44 @@ void kvm_set_max_memslot_size(hwaddr max_slot_size) kvm_max_slot_size = max_slot_size; } +static int kvm_set_memory_attributes(hwaddr start, hwaddr size, uint64_t attr) +{ + struct kvm_memory_attributes attrs; + int r; + + attrs.attributes = attr; + attrs.address = start; + attrs.size = size; + attrs.flags = 0; + + r = kvm_vm_ioctl(kvm_state, KVM_SET_MEMORY_ATTRIBUTES, &attrs); + if (r) { + warn_report("%s: failed to set memory (0x%lx+%#zx) with attr 0x%lx error '%s'", + __func__, start, size, attr, strerror(errno)); + } + return r; +} + +int kvm_set_memory_attributes_private(hwaddr start, hwaddr size) +{ + if (!(kvm_supported_memory_attributes & KVM_MEMORY_ATTRIBUTE_PRIVATE)) { + error_report("KVM doesn't support PRIVATE memory attribute\n"); + return -EINVAL; + } + + return kvm_set_memory_attributes(start, size, KVM_MEMORY_ATTRIBUTE_PRIVATE); +} + +int kvm_set_memory_attributes_shared(hwaddr start, hwaddr size) +{ + if (!(kvm_supported_memory_attributes & KVM_MEMORY_ATTRIBUTE_PRIVATE)) { + error_report("KVM doesn't support PRIVATE memory attribute\n"); + return -EINVAL; + } + + return kvm_set_memory_attributes(start, size, 0); +} + /* Called with KVMMemoryListener.slots_lock held */ static void kvm_set_phys_mem(KVMMemoryListener *kml, MemoryRegionSection *section, bool add) @@ -2440,6 +2479,9 @@ static int kvm_init(MachineState *ms) kvm_guest_memfd_supported = kvm_check_extension(s, KVM_CAP_GUEST_MEMFD); + ret = kvm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES); + kvm_supported_memory_attributes = ret > 0 ? ret : 0; + if (object_property_find(OBJECT(current_machine), "kvm-type")) { g_autofree char *kvm_type = object_property_get_str(OBJECT(current_machine), "kvm-type", diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index fedc28c7d17f..0e88958190a4 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -540,4 +540,7 @@ bool kvm_dirty_ring_enabled(void); uint32_t kvm_dirty_ring_size(void); int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp); + +int kvm_set_memory_attributes_private(hwaddr start, hwaddr size); +int kvm_set_memory_attributes_shared(hwaddr start, hwaddr size); #endif