From patchwork Sun Jun 9 15:49:37 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: 13691277 Received: from smtp-fw-33001.amazon.com (smtp-fw-33001.amazon.com [207.171.190.10]) (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 58ECB4436C; Sun, 9 Jun 2024 15:55:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=207.171.190.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717948528; cv=none; b=ci9uEsCAovYIM8SnOVLzxw68AnbqKhtn5yIt8dBSFRkIruWnf6vtztuNweDgtROz5ubyGDkvgCK0w3PVYGb4br6+VxrbpHF+lBv0jMXPhjRrYobh2Piipkn2i4Ev2RTS15oM0QOwarDy9kCEI7K6ashQQIbXEXB9nYgDl6wpz8w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717948528; c=relaxed/simple; bh=DqvLUFFsM4kKgd1oMzVjqszyKJwGL5RQYsMX7F6kX0k=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XMDx6vLF7AWmm9Eu+uYFxT/pfVgzjusiIcLVAuMHm8EogKw0D9Y/UE3zQxAS2MN39WGV6bNF9Bt/2zT4inUParRekdOQCTlC3vnhSG7R1P/LsaMjckXjvY6IXkdT2ro10hFHbiZojgHlc5bU/gFCtdEhjAHyT6aQT7quvlHqjSM= 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=ro4HUwWu; arc=none smtp.client-ip=207.171.190.10 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="ro4HUwWu" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1717948527; x=1749484527; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nTqojU/JXT3fYm8Yq++n3olx+D224pV1FluFfxEsmp8=; b=ro4HUwWuP0OAH0Cjayg4FsiaDRws1ubvoEbn+wQzkmcmqS4ZId1dbIZd itp1tVEye5uK8jH9rVaBZ+uhTqaaLCe1hDuv/hXAl7EG2aFNkFDIExiK5 LvZKwuNoCDkKHNavKKEcWwJOUQwQMnjK6kXC5YKIDYbu6LSp5bireczXM U=; X-IronPort-AV: E=Sophos;i="6.08,225,1712620800"; d="scan'208";a="349362166" 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-33001.sea14.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jun 2024 15:55:24 +0000 Received: from EX19MTAEUC002.ant.amazon.com [10.0.43.254:49558] by smtpin.naws.eu-west-1.prod.farcaster.email.amazon.dev [10.0.10.214:2525] with esmtp (Farcaster) id c7591299-d521-4ea1-9828-a09e4088386b; Sun, 9 Jun 2024 15:55:21 +0000 (UTC) X-Farcaster-Flow-ID: c7591299-d521-4ea1-9828-a09e4088386b Received: from EX19D004EUC001.ant.amazon.com (10.252.51.190) by EX19MTAEUC002.ant.amazon.com (10.252.51.245) 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 15:55:21 +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 15:55:15 +0000 From: Nicolas Saenz Julienne To: , CC: , , , , , , , , , , , , , , , , , , , , Subject: [PATCH 08/18] KVM: x86: hyper-v: Exit on StartVirtualProcessor and GetVpIndexFromApicId hcalls Date: Sun, 9 Jun 2024 15:49:37 +0000 Message-ID: <20240609154945.55332-9-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: EX19D045UWA002.ant.amazon.com (10.13.139.12) To EX19D004EUC001.ant.amazon.com (10.252.51.190) Both HvCallStartVirtualProcessor and GetVpIndexFromApicId are used as part of the Hyper-V VSM CPU bootstrap process, and requires VTL awareness, as such handle the hypercall in user-space. Also, expose the ad-hoc CPUID bit. Note that these hypercalls aren't necessary on Hyper-V guests that don't enable VSM. Signed-off-by: Nicolas Saenz Julienne --- Documentation/virt/kvm/api.rst | 11 +++++++++++ arch/x86/kvm/hyperv.c | 7 +++++++ include/asm-generic/hyperv-tlfs.h | 1 + 3 files changed, 19 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 05b01b00a395c..161a772c23c6a 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -8941,3 +8941,14 @@ This CPUID indicates that KVM supports HvGetVpRegisters and HvSetVpRegisters. Currently, it is only used in conjunction with HV_ACCESS_VSM, and immediately exits to userspace with KVM_EXIT_HYPERV_HCALL as the reason. Userspace is expected to complete the hypercall before resuming execution. + +10.3 HV_START_VIRTUAL_PROCESSOR +------------------------------- + +:Location: CPUID.40000003H:EBX[bit 21] + +This CPUID indicates that KVM supports HvCallStartVirtualProcessor and +HvCallGetVpIndexFromApicId. Currently, it is only used in conjunction with +HV_ACCESS_VSM, and immediately exits to userspace with KVM_EXIT_HYPERV_HCALL as +the reason. Userspace is expected to complete the hypercall before resuming +execution. diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index cbe2aca52514b..dd64f41dc835d 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2556,6 +2556,10 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code) case HVCALL_SET_VP_REGISTERS: return hv_vcpu->cpuid_cache.features_ebx & HV_ACCESS_VP_REGISTERS; + case HVCALL_START_VP: + case HVCALL_GET_VP_ID_FROM_APIC_ID: + return hv_vcpu->cpuid_cache.features_ebx & + HV_START_VIRTUAL_PROCESSOR; case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX: case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX: if (!(hv_vcpu->cpuid_cache.enlightenments_eax & @@ -2743,6 +2747,8 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu) case HVCALL_GET_VP_REGISTERS: case HVCALL_SET_VP_REGISTERS: case HVCALL_TRANSLATE_VIRTUAL_ADDRESS: + case HVCALL_START_VP: + case HVCALL_GET_VP_ID_FROM_APIC_ID: goto hypercall_userspace_exit; default: ret = HV_STATUS_INVALID_HYPERCALL_CODE; @@ -2916,6 +2922,7 @@ int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, ent->ebx |= HV_SIGNAL_EVENTS; ent->ebx |= HV_ENABLE_EXTENDED_HYPERCALLS; ent->ebx |= HV_ACCESS_VP_REGISTERS; + ent->ebx |= HV_START_VIRTUAL_PROCESSOR; ent->edx |= HV_X64_HYPERCALL_XMM_INPUT_AVAILABLE; ent->edx |= HV_X64_HYPERCALL_XMM_OUTPUT_AVAILABLE; diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index 57c791c555861..e24b88ec4ec00 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -92,6 +92,7 @@ #define HV_ACCESS_VSM BIT(16) #define HV_ACCESS_VP_REGISTERS BIT(17) #define HV_ENABLE_EXTENDED_HYPERCALLS BIT(20) +#define HV_START_VIRTUAL_PROCESSOR BIT(21) #define HV_ISOLATION BIT(22) /*