From patchwork Sun Jun 9 15:49:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 13691273 Received: from smtp-fw-52003.amazon.com (smtp-fw-52003.amazon.com [52.119.213.152]) (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 66DF145BF1; Sun, 9 Jun 2024 15:52:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=52.119.213.152 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717948366; cv=none; b=dN27R75wFSZHluGqaYuwvV1kOj7cEgDip+fSmBBiueKE9cE5pPIBvTEJ1OvU6wW4zIUzGSNtbhsNMbLZYwfEDZbe5KrMvOo4ib2JBSlHFDjLkAlZRF1qqOxzeEC7XWkrv+RxjvLpUQD0f1y0lKSHSL2kEp7VFYZuTRNRxtjsBGQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717948366; c=relaxed/simple; bh=O57QZSKQXPGZrBKQ3RZKVtUEiqpL95hz4AvhMAmm7MY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IC8JWCyOjFglKBiZAvbptMwKBzbntdkg0amDv7zWvjbiPn3XWzHovC0kXDaAX2b8b20y+55mb2aLov8BTTDxRMYVzqNjayS+hm54rsYiLPui45+u7MWYTTLTstk4E5iRpNohPikF+23MSbiyJ77MakEM5JAYenWLkAn3CQY4b5I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.es; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b=vDSwP40q; arc=none smtp.client-ip=52.119.213.152 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.es Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="vDSwP40q" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1717948365; x=1749484365; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=mVP6aPqw1csbFkoDM3jiyC1IOI7STtntA93lIEw6LCQ=; b=vDSwP40qfWKBjwjiCnyJqOo+Eq6EvP/AR6/jjra9Y/ndcceoi1BbVoUZ oBwGeZihrPF+YQdRx6OJEx2vr3o0m50jSUx3FErSl2HSp6+todFfUfBw4 v2V9ekt+hMuHBoX01kZPIfP7aSRhXpbSFmp6VkH2PwePZ/tCcRn4BAC6i E=; X-IronPort-AV: E=Sophos;i="6.08,225,1712620800"; d="scan'208";a="3828056" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.43.8.6]) by smtp-border-fw-52003.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jun 2024 15:52:41 +0000 Received: from EX19MTAEUB001.ant.amazon.com [10.0.17.79:56310] by smtpin.naws.eu-west-1.prod.farcaster.email.amazon.dev [10.0.10.214:2525] with esmtp (Farcaster) id 2c750468-da6e-4b39-9ee5-571566531d31; Sun, 9 Jun 2024 15:52:39 +0000 (UTC) X-Farcaster-Flow-ID: 2c750468-da6e-4b39-9ee5-571566531d31 Received: from EX19D004EUC001.ant.amazon.com (10.252.51.190) by EX19MTAEUB001.ant.amazon.com (10.252.51.28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Sun, 9 Jun 2024 15:52:38 +0000 Received: from dev-dsk-nsaenz-1b-189b39ae.eu-west-1.amazon.com (10.13.235.138) by EX19D004EUC001.ant.amazon.com (10.252.51.190) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Sun, 9 Jun 2024 15:52:32 +0000 From: Nicolas Saenz Julienne To: , CC: , , , , , , , , , , , , , , , , , , , , Subject: [PATCH 04/18] KVM: x86: hyper-v: Introduce VTL awareness to Hyper-V's PV-IPIs Date: Sun, 9 Jun 2024 15:49:32 +0000 Message-ID: <20240609154945.55332-5-nsaenz@amazon.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240609154945.55332-1-nsaenz@amazon.com> References: <20240609154945.55332-1-nsaenz@amazon.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: EX19D031UWA001.ant.amazon.com (10.13.139.88) To EX19D004EUC001.ant.amazon.com (10.252.51.190) HvCallSendSyntheticClusterIpi and HvCallSendSyntheticClusterIpiEx allow sending VTL-aware IPIs. Honour the hcall by exiting to user-space upon receiving a request with a valid VTL target. This behaviour is only available if the VSM CPUID flag is available and exposed to the guest. It doesn't introduce a behaviour change otherwise. User-space is accountable for the correct processing of the PV-IPI before resuming execution. Signed-off-by: Nicolas Saenz Julienne --- arch/x86/kvm/hyperv.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 42f44546fe79c..d00baf3ffb165 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2217,16 +2217,20 @@ static void kvm_hv_send_ipi_to_many(struct kvm *kvm, u32 vector, static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) { + bool vsm_enabled = kvm_hv_cpuid_vsm_enabled(vcpu); struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); u64 *sparse_banks = hv_vcpu->sparse_banks; struct kvm *kvm = vcpu->kvm; struct hv_send_ipi_ex send_ipi_ex; struct hv_send_ipi send_ipi; + union hv_input_vtl *in_vtl; u64 valid_bank_mask; + int rsvd_shift; u32 vector; bool all_cpus; if (hc->code == HVCALL_SEND_IPI) { + in_vtl = &send_ipi.in_vtl; if (!hc->fast) { if (unlikely(kvm_read_guest(kvm, hc->ingpa, &send_ipi, sizeof(send_ipi)))) @@ -2235,16 +2239,22 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) vector = send_ipi.vector; } else { /* 'reserved' part of hv_send_ipi should be 0 */ - if (unlikely(hc->ingpa >> 32 != 0)) + rsvd_shift = vsm_enabled ? 40 : 32; + if (unlikely(hc->ingpa >> rsvd_shift != 0)) return HV_STATUS_INVALID_HYPERCALL_INPUT; + in_vtl->as_uint8 = (u8)(hc->ingpa >> 32); sparse_banks[0] = hc->outgpa; vector = (u32)hc->ingpa; } all_cpus = false; valid_bank_mask = BIT_ULL(0); + if (in_vtl->use_target_vtl) + return -ENODEV; + trace_kvm_hv_send_ipi(vector, sparse_banks[0]); } else { + in_vtl = &send_ipi_ex.in_vtl; if (!hc->fast) { if (unlikely(kvm_read_guest(kvm, hc->ingpa, &send_ipi_ex, sizeof(send_ipi_ex)))) @@ -2253,8 +2263,12 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) send_ipi_ex.vector = (u32)hc->ingpa; send_ipi_ex.vp_set.format = hc->outgpa; send_ipi_ex.vp_set.valid_bank_mask = sse128_lo(hc->xmm[0]); + in_vtl->as_uint8 = (u8)(hc->ingpa >> 32); } + if (vsm_enabled && in_vtl->use_target_vtl) + return -ENODEV; + trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector, send_ipi_ex.vp_set.format, send_ipi_ex.vp_set.valid_bank_mask); @@ -2682,6 +2696,9 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu) break; } ret = kvm_hv_send_ipi(vcpu, &hc); + /* VTL-enabled ipi, let user-space handle it */ + if (ret == -ENODEV) + goto hypercall_userspace_exit; break; case HVCALL_POST_DEBUG_DATA: case HVCALL_RETRIEVE_DEBUG_DATA: