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[109.243.71.38]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b80464e01d9sm1306260566b.42.2025.12.23.09.02.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Dec 2025 09:02:08 -0800 (PST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 1e775447-e021-11f0-b15b-2bf370ae4941 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1766509329; x=1767114129; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=S95KJYi4jIB1ArhFJq9VOfQamAB3y8b+WB2+NeoNQsg=; b=D6aw+pG0j8x6elEPVh0rp33t/TZUqrCSxRj86XqkkIYlrqAdFnaMH1pUXBY0NdJbpI JrsRKDmOvnezLRUOS0rXwwMhzBgs2ZYZ4Z1RMDCmgPsCxIuAiw0pQob+q9DS6c+aEqBW patnWSGf0fCr9d1i+MigsVMKOPLilUrqQQNTJnKqm/Ti8yYhkynb/pvljcfSHXMGVfZq aX+VW3mc2XDtavEx4eA/v3aZQPW+6ftCFlK85VueuEqwCysEtnXT9G4Vu69Y7yF20r8Y 6P5oSjL3h3seDDMy8CH9ss6uyQomjhnK2HF4oAfZZ12Is0CS+EgkyxNf+AAwulFzDTwN e/5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766509329; x=1767114129; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=S95KJYi4jIB1ArhFJq9VOfQamAB3y8b+WB2+NeoNQsg=; b=qZ0hpZkdjT0MwjGG/S0BeXRRpfNeEN+GC1Fl5PKwqkbjQzIcZQRUnBt5TWlTCzWhk5 0mJsE71TOwyGU0XCHnPRbMT/XWscvgzggeqVS76dqCCO3KIKzoEr7Hn+HTKDJYOmsGJj Jj0bmqxfxrI1qkrwehZnU6+btlHLN4lxBGooTFEES5PANeBFAk4jAPuF9AuteNe+0VvE vTCqv/uosqkcQ1fiN/4Zg91pg3M+CVT9IBAc+tjwwYrKld3S+I1TBBB9OPXs/7IRYYew 7hNtFr/D9/o+3AcQlvReAnS2XXiAfc6sxw+bxV4qu8Sulbvth2zcxlICohPstqShPxCN ss0g== X-Gm-Message-State: AOJu0YzDMvTgOfYay8YEVPaL+Zk3a88/BUQ3p6Pj/sCXyoIvnoktlZQa fkQApRPh41tDOXcmsIO1bfxoa8KT2f5J5P8KfPZoSj2zZx58K6EkHxh1DXLjRA== X-Gm-Gg: AY/fxX7fbSLpqhSP84TBON2f4viCFwcTLR2gXXhDddxUytczqVhNIsWwwA2v0SpWChc F5Bh5Qmirjplhe0HznRA9hKBp7iHyLvczEPZPagBU9YLFKxFIx4A4C7M9Fc7GCe7QY5oFiVHKZZ TKcsiZiy5Je2gVjCnFdqBcqUOqOTxpGVQ1XygSjrYrPomJKGXXB/4ZWm+HeudNMnzLYanYL2fWX aulvFQIh8YUoAu/tRc0IPA6qL/5Mi0Aqnt5ySjN4tin6npzqwtBOnq6JRCODLkrFlzNlPPn7JAf LfV+e3Or4ePDADBxSFf0+GksS6ZYD7ycVonGtw70J3ZA2WXLBBdJv1hXeAtf1Acl5XmNHmSHT0Q NX74hlVRlw81/E9ScSsqsWXxTJUv84yS/WGKWT4zsENMyoy5NbfjRhce8KRG7CYbWOHKHrykiED JOqaz2ZdVu89iuZ31oDk/6tbYWwjcUkvLM27OoWZ7QBeUaBCQw52Uk+PM= X-Google-Smtp-Source: AGHT+IGpGaRAzqQ1l6lcLkd3EgAivjDFotE6e8nL5bz+/5hixOWejp5H7cVVzYJVmdmv5kDkCCMIsw== X-Received: by 2002:a17:907:70d7:b0:b80:1403:764c with SMTP id a640c23a62f3a-b80205e6bd3mr1400852366b.24.1766509329133; Tue, 23 Dec 2025 09:02:09 -0800 (PST) From: Oleksii Kurochko To: xen-devel@lists.xenproject.org Cc: Oleksii Kurochko , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk , Andrew Cooper Subject: [PATCH v4 2/4] xen/arm: optimize the size of struct vcpu Date: Tue, 23 Dec 2025 18:01:56 +0100 Message-ID: <0756ee97dd47f6acdefe593694b743eb6bfefacb.1766504313.git.oleksii.kurochko@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1766509364429158500 Content-Type: text/plain; charset="utf-8" When CONFIG_NEW_VGIC=3Dy and CONFIG_ARM_64=3Dy, the size of struct vcpu exceeds one page, which requires allocating two pages and led to the introduction of MAX_PAGES_PER_VCPU. To remove the need for MAX_PAGES_PER_VCPU in a follow-up patch, the vgic member of NEW_VGIC's struct vgic_vcpu member private_irq is changed to a pointer to struct vgic_irq. As a result, the size of struct vcpu for Arm64 is reduced to 2176 bytes, compared to 3840 bytes (without these changes and with CONFIG_ARM_64=3Dy) and 4736 bytes (without these changes and with both CONFIG_ARM_64=3Dy and CONFIG_NEW_VGIC=3Dy). Since the private_irqs member is now a pointer, vcpu_vgic_init() and vcpu_vgic_free() are updated to allocate and free private_irqs instance. Suggested-by: Andrew Cooper Signed-off-by: Oleksii Kurochko Reviewed-by: Andrew Cooper Acked-by: Michal Orzel --- Change in v4: - Add Reviewed-by: Andrew Cooper . --- Changes in v3: - Make private_irqs member as pointer to vgic_irq in struct vgic_cpu of new_vgic instead of vgic member of arch_vcpu. --- Changes in v2: - New patch. --- xen/arch/arm/include/asm/new_vgic.h | 2 +- xen/arch/arm/vgic/vgic-init.c | 7 +++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/include/asm/new_vgic.h b/xen/arch/arm/include/asm= /new_vgic.h index 1e762138939f..6f7af0e02b2b 100644 --- a/xen/arch/arm/include/asm/new_vgic.h +++ b/xen/arch/arm/include/asm/new_vgic.h @@ -155,7 +155,7 @@ struct vgic_dist { }; =20 struct vgic_cpu { - struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS]; + struct vgic_irq *private_irqs; =20 struct list_head ap_list_head; spinlock_t ap_list_lock; /* Protects the ap_list */ diff --git a/xen/arch/arm/vgic/vgic-init.c b/xen/arch/arm/vgic/vgic-init.c index aef526f2e717..4eb49d922492 100644 --- a/xen/arch/arm/vgic/vgic-init.c +++ b/xen/arch/arm/vgic/vgic-init.c @@ -202,6 +202,11 @@ int vcpu_vgic_init(struct vcpu *v) { int ret =3D 0; =20 + v->arch.vgic.private_irqs =3D + xzalloc_array(struct vgic_irq, VGIC_NR_PRIVATE_IRQS); + if ( !v->arch.vgic.private_irqs ) + return -ENOMEM; + vgic_vcpu_early_init(v); =20 if ( gic_hw_version() =3D=3D GIC_V2 ) @@ -244,6 +249,8 @@ void vcpu_vgic_free(struct vcpu *v) struct vgic_cpu *vgic_cpu =3D &v->arch.vgic; =20 INIT_LIST_HEAD(&vgic_cpu->ap_list_head); + + XFREE(v->arch.vgic.private_irqs); } =20 /* --=20 2.52.0