From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44981) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eIE4N-0001aY-R1 for qemu-devel@nongnu.org; Fri, 24 Nov 2017 08:31:04 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eIE4K-0001qe-JW for qemu-devel@nongnu.org; Fri, 24 Nov 2017 08:31:03 -0500 From: Eric Auger Date: Fri, 24 Nov 2017 14:30:36 +0100 Message-Id: <1511530238-18318-3-git-send-email-eric.auger@redhat.com> In-Reply-To: <1511530238-18318-1-git-send-email-eric.auger@redhat.com> References: <1511530238-18318-1-git-send-email-eric.auger@redhat.com> Subject: [Qemu-devel] [PATCH v4 2/4] hw/intc/arm_gicv3_its: Implement a minimalist reset List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: eric.auger.pro@gmail.com, eric.auger@redhat.com, peter.maydell@linaro.org, qemu-arm@nongnu.org, qemu-devel@nongnu.org, wanghaibin.wang@huawei.com Cc: vijay.kilari@gmail.com, drjones@redhat.com, wei@redhat.com, quintela@redhat.com, dgilbert@redhat.com, christoffer.dall@linaro.org, wu.wubin@huawei.com At the moment the ITS is not properly reset and this causes various bugs on save/restore. We implement a minimalist reset through individual register writes but for kernel versions before v4.15 this fails voiding the vITS cache. We cannot claim we have a comprehensive reset (hence the error message) but that's better than nothing. Signed-off-by: Eric Auger --- v2 -> v3: - individual register writes performed in kvm_arm_its_reset - check KVM_DEV_ARM_VGIC_GRP_ITS_REGS support --- hw/intc/arm_gicv3_its_kvm.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/hw/intc/arm_gicv3_its_kvm.c b/hw/intc/arm_gicv3_its_kvm.c index b1b322b..83e5268 100644 --- a/hw/intc/arm_gicv3_its_kvm.c +++ b/hw/intc/arm_gicv3_its_kvm.c @@ -28,6 +28,16 @@ #define TYPE_KVM_ARM_ITS "arm-its-kvm" #define KVM_ARM_ITS(obj) OBJECT_CHECK(GICv3ITSState, (obj), TYPE_KVM_ARM_ITS) +#define KVM_ARM_ITS_CLASS(klass) \ + OBJECT_CLASS_CHECK(KVMARMITSClass, (klass), TYPE_KVM_ARM_ITS) +#define KVM_ARM_ITS_GET_CLASS(obj) \ + OBJECT_GET_CLASS(KVMARMITSClass, (obj), TYPE_KVM_ARM_ITS) + +typedef struct KVMARMITSClass { + GICv3ITSCommonClass parent_class; + void (*parent_reset)(DeviceState *dev); +} KVMARMITSClass; + static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid) { @@ -186,6 +196,34 @@ static void kvm_arm_its_post_load(GICv3ITSState *s) GITS_CTLR, &s->ctlr, true, &error_abort); } +static void kvm_arm_its_reset(DeviceState *dev) +{ + GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev); + KVMARMITSClass *c = KVM_ARM_ITS_GET_CLASS(s); + int i; + + c->parent_reset(dev); + + error_report("ITS KVM: full reset is not supported by the host kernel"); + + if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, + GITS_CTLR)) { + return; + } + + kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, + GITS_CTLR, &s->ctlr, true, &error_abort); + + kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, + GITS_CBASER, &s->cbaser, true, &error_abort); + + for (i = 0; i < 8; i++) { + kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS, + GITS_BASER + i * 8, &s->baser[i], true, + &error_abort); + } +} + static Property kvm_arm_its_props[] = { DEFINE_PROP_LINK("parent-gicv3", GICv3ITSState, gicv3, "kvm-arm-gicv3", GICv3State *), @@ -196,12 +234,15 @@ static void kvm_arm_its_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass); + KVMARMITSClass *ic = KVM_ARM_ITS_CLASS(klass); dc->realize = kvm_arm_its_realize; dc->props = kvm_arm_its_props; + ic->parent_reset = dc->reset; icc->send_msi = kvm_its_send_msi; icc->pre_save = kvm_arm_its_pre_save; icc->post_load = kvm_arm_its_post_load; + dc->reset = kvm_arm_its_reset; } static const TypeInfo kvm_arm_its_info = { -- 2.5.5