From mboxrd@z Thu Jan 1 00:00:00 1970 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 15B0BC5516F for ; Fri, 31 Jul 2026 14:36:39 +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-Type:Cc:To:From: Subject:Message-ID:References:Mime-Version:In-Reply-To:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Aq7OL9INhErui4mdU1lyC65L9SJ7juDhRrdFW2tdhO4=; b=cmqh9CzXFnltYmqfM8AK8bme8M HEHuWkzrx8iMXu87u4y2oZl7n8htzWWDm2+ucJEqpV6p6NPypYeAtkyYB893fboJZmC/u2M20ceDu JqEUQvS84KkZHD1IJVOPun2LwxFbFQ3wpN9V9ol5JKmgMMArlsx6nbF8ruttQQ1H29npUpQObGHn8 m1HFiMA3od2FYNWEJF0slBPr3PFiAWjYsWE84gQ+HLF2EKRdPcsNL0cUCahJInletj7jI0Aku3rO9 U7XhDHH1R9YW6Yhvgk6dK050h8QX2RwVEyvL95nPn8EmtV/pWbYVx2p8b8U/0iVimlXxf03WbgAuS U4z0RjLQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wpoLY-0000000Cjfn-3et0; Fri, 31 Jul 2026 14:36:24 +0000 Received: from mail-ed1-x547.google.com ([2a00:1450:4864:20::547]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wpoLF-0000000CjU7-2IYr for linux-arm-kernel@lists.infradead.org; Fri, 31 Jul 2026 14:36:07 +0000 Received: by mail-ed1-x547.google.com with SMTP id 4fb4d7f45d1cf-69e3aaf5ea3so1316317a12.2 for ; Fri, 31 Jul 2026 07:36:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785508563; x=1786113363; darn=lists.infradead.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=Aq7OL9INhErui4mdU1lyC65L9SJ7juDhRrdFW2tdhO4=; b=L1UU9rfaZ/IXmmpuK9eQCTloVSdqqiZYmBuHgIasSNjTPv7OqBUZ2Cd9/RF5LG0pAu r/To8pqFmCGmqIb0ojW/suokVgC5wJOgQ7oyk+o3W0NoZblcWoM/CjHiN8xzfd0V2S/K eYcQGDAGUxqw27UTCVr4/ylYvxFb1dNg19OMkO7QgIPOjJlooJHpidUorFCPAJf6z/BZ PuxqculDry8syyK/0sbPE1cIDrFiZ+ZoVnztZtUeqeGLfOdIavYYtaKGrNOWsq5aFs35 XXm4jEJG6ta62q9F5p3Fq0eUkjpsPBnOtf4Gy3V4IN6ctoLufEKtfrSrLjP332fezH/z NcyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785508563; x=1786113363; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Aq7OL9INhErui4mdU1lyC65L9SJ7juDhRrdFW2tdhO4=; b=FuWux3C/z+raHIHc4r+fAId6ZiScIJJLjT8St1WDO1Yb4BAC3txHXhiwSO/OjvDd0O OC+mzjAQOzo0Rgiesu44f+fbAEX920ALfapx2719xbxnARjLG23C22lTMX4kBW6Cnxys RGR50SOwqjxSbZvlCdwMga7ApjtDs9lj9OZHFYQ9G0325WOYXN68hJKCIf1PX/CP4MCy 9I/Vs/gnK8xkHIG6TU12xvd43K3jHUIHOuaLwX4WjG9pXzSiO90sU8GybPjOs1y6vX5l MEaquCplhfjUkbZoKUSmbNpWepv6LZAe4yMAy0t1qcBKM7ok1LVpeMyPJBR1JcrqrZGx mUzg== X-Forwarded-Encrypted: i=1; AHgh+RqHF7kndtjjjukpdmUFn8sGkSUxzyzlQkVTU3VwGaCa4RxoK3S5vaWBMUBVl5ant4ywOyTUGA/A1zxw9ITJEjA7@lists.infradead.org X-Gm-Message-State: AOJu0YyTcVVoNxrb/f70uNj/2zjY276QLcjqV2jrAYVrO8albNUlV/qW 85xe42v9sKqITs3dHqGrveVAtIGwKGjUg4S4q64Aao2Bv3r7eZ7HD2jlvrAsOVO7idz7hikwAdu ByM6aG4e/mq53GN9eaVzEZg== X-Received: from wmdv2.prod.google.com ([2002:a05:600c:12c2:b0:493:c481:d8e9]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6402:4316:b0:698:ac05:5b2f with SMTP id 4fb4d7f45d1cf-6a098c9da58mr1450065a12.4.1785508562624; Fri, 31 Jul 2026 07:36:02 -0700 (PDT) Date: Fri, 31 Jul 2026 15:35:31 +0100 In-Reply-To: <20260731143541.956291-1-vdonnefort@google.com> Mime-Version: 1.0 References: <20260731143541.956291-1-vdonnefort@google.com> X-Mailer: git-send-email 2.55.0.508.g3f0d502094-goog Message-ID: <20260731143541.956291-8-vdonnefort@google.com> Subject: [PATCH v4 07/17] KVM: arm64: Add PKVM_HYP_REQ_HYP_ALLOC request From: Vincent Donnefort To: maz@kernel.org, oupton@kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, kernel-team@android.com, fuad.tabba@linux.dev, qperret@google.com, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260731_073605_621508_546BE3DF X-CRM114-Status: GOOD ( 14.86 ) 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 Introduce a new pkvm_hyp_request type asking the host to top up the pKVM heap allocator. Tested-by: Fuad Tabba Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 043495f7fc78..b77acfd7d1c8 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -89,6 +89,7 @@ enum __kvm_host_smccc_func { __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_vmcr_aprs, __KVM_HOST_SMCCC_FUNC___vgic_v5_save_apr, __KVM_HOST_SMCCC_FUNC___vgic_v5_restore_vmcr_apr, + __KVM_HOST_SMCCC_FUNC___pkvm_hyp_topup, MARKER(__KVM_HOST_SMCCC_FUNC_PKVM_ONLY), diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h index 6c2497047f8d..99daa985856f 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -17,6 +17,10 @@ #define HYP_MEMBLOCK_REGIONS 128 +enum pkvm_topup_id { + PKVM_TOPUP_HYP_ALLOC, +}; + int pkvm_init_host_vm(struct kvm *kvm, unsigned long type); int pkvm_create_hyp_vm(struct kvm *kvm); bool pkvm_hyp_vm_is_created(struct kvm *kvm); @@ -201,6 +205,7 @@ struct pkvm_mapping { enum pkvm_hyp_req_type { PKVM_HYP_NO_REQ = 0, + PKVM_HYP_REQ_HYP_ALLOC, __PKVM_HYP_REQ_TYPE_MAX, }; @@ -222,9 +227,13 @@ struct pkvm_hyp_req { static inline size_t pkvm_hyp_req_arg_size(u8 type) { + struct pkvm_hyp_req *req; + switch (type) { case PKVM_HYP_NO_REQ: return 0; + case PKVM_HYP_REQ_HYP_ALLOC: + return sizeof(req->mem); default: WARN_ON(1); } diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index d3c69de698f4..439b91fc8aec 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -15,6 +15,7 @@ #include #include +#include #include #include #include @@ -632,6 +633,30 @@ static void handle___pkvm_finalize_teardown_vm(struct kvm_cpu_context *host_ctxt cpu_reg(host_ctxt, 1) = __pkvm_finalize_teardown_vm(handle); } +static void handle___pkvm_hyp_topup(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(enum pkvm_topup_id, id, host_ctxt, 1); + DECLARE_REG(phys_addr_t, head, host_ctxt, 2); + DECLARE_REG(unsigned long, nr_pages, host_ctxt, 3); + struct kvm_hyp_memcache host_mc = { + .head = head, + .nr_pages = nr_pages, + }; + int ret; + + switch (id) { + case PKVM_TOPUP_HYP_ALLOC: + ret = hyp_alloc_topup(&host_mc); + break; + default: + ret = -EINVAL; + } + + cpu_reg(host_ctxt, 1) = ret; + cpu_reg(host_ctxt, 2) = host_mc.head; + cpu_reg(host_ctxt, 3) = host_mc.nr_pages; +} + static void handle___tracing_load(struct kvm_cpu_context *host_ctxt) { DECLARE_REG(unsigned long, desc_hva, host_ctxt, 1); @@ -740,6 +765,7 @@ static const hcall_t host_hcall[] = { HANDLE_FUNC(__vgic_v3_restore_vmcr_aprs), HANDLE_FUNC(__vgic_v5_save_apr), HANDLE_FUNC(__vgic_v5_restore_vmcr_apr), + HANDLE_FUNC(__pkvm_hyp_topup), HANDLE_FUNC(__pkvm_host_share_hyp), HANDLE_FUNC(__pkvm_host_unshare_hyp), diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index a626978dc91f..d26e7435d34d 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -88,6 +88,33 @@ void __init kvm_hyp_reserve(void) hyp_mem_base); } +static int pkvm_hyp_topup(enum pkvm_topup_id id, unsigned long nr_pages) +{ + struct kvm_hyp_memcache mc; + struct arm_smccc_res res; + int ret; + + init_hyp_memcache(&mc); + ret = topup_hyp_memcache(&mc, nr_pages); + if (ret) + goto err; + + arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__pkvm_hyp_topup), id, mc.head, + mc.nr_pages, &res); + if (WARN_ON_ONCE(res.a0 != SMCCC_RET_SUCCESS)) { + ret = -EINVAL; + goto err; + } + + ret = res.a1; + mc.head = res.a2; + mc.nr_pages = res.a3; + +err: + free_hyp_memcache(&mc); + return ret; +} + static void __pkvm_destroy_hyp_vm(struct kvm *kvm) { if (pkvm_hyp_vm_is_created(kvm)) { @@ -599,6 +626,9 @@ static int pkvm_handle_hyp_req(struct pkvm_hyp_req *req) int ret = -EINVAL; switch (req->type) { + case PKVM_HYP_REQ_HYP_ALLOC: + ret = pkvm_hyp_topup(PKVM_TOPUP_HYP_ALLOC, req->mem.nr_pages); + break; } trace_kvm_handle_pkvm_hyp_req(req, ret); diff --git a/arch/arm64/kvm/trace_pkvm.h b/arch/arm64/kvm/trace_pkvm.h index 3966c111e3ad..493225e3282d 100644 --- a/arch/arm64/kvm/trace_pkvm.h +++ b/arch/arm64/kvm/trace_pkvm.h @@ -9,9 +9,11 @@ #define TRACE_SYSTEM kvm TRACE_DEFINE_ENUM(PKVM_HYP_NO_REQ); +TRACE_DEFINE_ENUM(PKVM_HYP_REQ_HYP_ALLOC); -#define PKVM_HYP_REQ_TYPES \ - { PKVM_HYP_NO_REQ, "NO_REQ" } +#define PKVM_HYP_REQ_TYPES \ + { PKVM_HYP_NO_REQ, "NO_REQ" }, \ + { PKVM_HYP_REQ_HYP_ALLOC, "HYP_ALLOC" } TRACE_EVENT(kvm_handle_pkvm_hyp_req, TP_PROTO(struct pkvm_hyp_req *req, int ret), -- 2.55.0.508.g3f0d502094-goog