From patchwork Thu Dec 12 15:55:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13905584 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 33E6BE7717F for ; Thu, 12 Dec 2024 16:29:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Vdan9Fo+CpysdhBvj0DZKjDqP0kdPlRPOWfMDU5KpnY=; b=YGHrrk4owji/JESQUX9yh2JQZH mhatjiZlWQeLjs13JNYhy8l1ZQsxTMljN4tx3u706KfVhPRBRWvdbxWM0P5tVa0ZTQbkREoIW7FzY CFkVYzm/QRnW72TrZ2DIn+s+9jD/PBejUBXAjxpTCinHBxv2I3UMxgFtXTR4Uamjov4sT0FVg7Jh+ JToe0eD2obOUH5C5M2mQXsUqbJ8O2dInRd7HFm+pu63/ArF2JLXblGzAW3AXJ79XEvCSEKZpMTLwY 0Nipo9BEFvzjaa/EoYTydl4slpzy+oYhjC68U0qVjkArwkGVS1CSPHZyIyr+DXoNkcXzyawhxl833 vpKgLoDQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tLm3t-00000000yiE-0Onp; Thu, 12 Dec 2024 16:29:13 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tLlZI-00000000r2X-2TlP for linux-arm-kernel@lists.infradead.org; Thu, 12 Dec 2024 15:57:37 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 47C501764; Thu, 12 Dec 2024 07:58:04 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.39.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 07C1D3F720; Thu, 12 Dec 2024 07:57:32 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" Subject: [PATCH v6 15/43] KVM: arm64: Support timers in realm RECs Date: Thu, 12 Dec 2024 15:55:40 +0000 Message-ID: <20241212155610.76522-16-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241212155610.76522-1-steven.price@arm.com> References: <20241212155610.76522-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241212_075736_713926_80A7D1CC X-CRM114-Status: GOOD ( 18.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The RMM keeps track of the timer while the realm REC is running, but on exit to the normal world KVM is responsible for handling the timers. A later patch adds the support for propagating the timer values from the exit data structure and calling kvm_realm_timers_update(). Signed-off-by: Steven Price --- arch/arm64/kvm/arch_timer.c | 45 ++++++++++++++++++++++++++++++++---- include/kvm/arm_arch_timer.h | 2 ++ 2 files changed, 43 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c index 1215df590418..46fa903ed7ab 100644 --- a/arch/arm64/kvm/arch_timer.c +++ b/arch/arm64/kvm/arch_timer.c @@ -162,6 +162,13 @@ static void timer_set_cval(struct arch_timer_context *ctxt, u64 cval) static void timer_set_offset(struct arch_timer_context *ctxt, u64 offset) { + struct kvm_vcpu *vcpu = ctxt->vcpu; + + if (kvm_is_realm(vcpu->kvm)) { + WARN_ON(offset); + return; + } + if (!ctxt->offset.vm_offset) { WARN(offset, "timer %ld\n", arch_timer_ctx_index(ctxt)); return; @@ -459,6 +466,21 @@ static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level, } } +void kvm_realm_timers_update(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *arch_timer = &vcpu->arch.timer_cpu; + int i; + + for (i = 0; i < NR_KVM_EL0_TIMERS; i++) { + struct arch_timer_context *timer = &arch_timer->timers[i]; + bool status = timer_get_ctl(timer) & ARCH_TIMER_CTRL_IT_STAT; + bool level = kvm_timer_irq_can_fire(timer) && status; + + if (level != timer->irq.level) + kvm_timer_update_irq(vcpu, level, timer); + } +} + /* Only called for a fully emulated timer */ static void timer_emulate(struct arch_timer_context *ctx) { @@ -830,6 +852,8 @@ void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu) if (unlikely(!timer->enabled)) return; + kvm_timer_unblocking(vcpu); + get_timer_map(vcpu, &map); if (static_branch_likely(&has_gic_active_state)) { @@ -843,8 +867,6 @@ void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu) kvm_timer_vcpu_load_nogic(vcpu); } - kvm_timer_unblocking(vcpu); - timer_restore_state(map.direct_vtimer); if (map.direct_ptimer) timer_restore_state(map.direct_ptimer); @@ -987,7 +1009,9 @@ static void timer_context_init(struct kvm_vcpu *vcpu, int timerid) ctxt->vcpu = vcpu; - if (timerid == TIMER_VTIMER) + if (kvm_is_realm(vcpu->kvm)) + ctxt->offset.vm_offset = NULL; + else if (timerid == TIMER_VTIMER) ctxt->offset.vm_offset = &kvm->arch.timer_data.voffset; else ctxt->offset.vm_offset = &kvm->arch.timer_data.poffset; @@ -1010,13 +1034,19 @@ static void timer_context_init(struct kvm_vcpu *vcpu, int timerid) void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu) { struct arch_timer_cpu *timer = vcpu_timer(vcpu); + u64 cntvoff; for (int i = 0; i < NR_KVM_TIMERS; i++) timer_context_init(vcpu, i); + if (kvm_is_realm(vcpu->kvm)) + cntvoff = 0; + else + cntvoff = kvm_phys_timer_read(); + /* Synchronize offsets across timers of a VM if not already provided */ if (!test_bit(KVM_ARCH_FLAG_VM_COUNTER_OFFSET, &vcpu->kvm->arch.flags)) { - timer_set_offset(vcpu_vtimer(vcpu), kvm_phys_timer_read()); + timer_set_offset(vcpu_vtimer(vcpu), cntvoff); timer_set_offset(vcpu_ptimer(vcpu), 0); } @@ -1524,6 +1554,13 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu) return -EINVAL; } + /* + * We don't use mapped IRQs for Realms because the RMI doesn't allow + * us setting the LR.HW bit in the VGIC. + */ + if (vcpu_is_rec(vcpu)) + return 0; + get_timer_map(vcpu, &map); ret = kvm_vgic_map_phys_irq(vcpu, diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h index fd650a8789b9..21297643e529 100644 --- a/include/kvm/arm_arch_timer.h +++ b/include/kvm/arm_arch_timer.h @@ -112,6 +112,8 @@ int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr); +void kvm_realm_timers_update(struct kvm_vcpu *vcpu); + u64 kvm_phys_timer_read(void); void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);