From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 9DD8A36C9D5; Wed, 20 May 2026 08:50:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779267054; cv=none; b=WT9DbFRcPBL4QFo0W8GO0dVvFKrruwPS2V073QrmexGHi0duYMji+G80OjeVVdjXcf3GndSMHiYEJBd/iIdQPoTb5iB0HlCWbZzR3MV4s7kHAPYnplO97GmMJwZ1rugXjCbOLTDNPEcADbJXB2dwgX4KBABjCU//aMLxEvoEwB8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779267054; c=relaxed/simple; bh=c5kdWl+y4beGFsESYmy3xO397Dj/KsMvn5975JH+kxw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Mm01RNvzcMV5D05Dcj8CDE076wbftZjWCfR5hrBuQRMlpAGKbkMSnZ5iK0xS5or/T6ivRSpvfMJJUv0d+ke3rFJVwef5l4NJsdrZsARLkNmkobyo41Ngg7YfGjwG0h1BH890/GFeKye7gjppSBJHYsbvQybDLvuBQwchWVC/sqQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lyr7vTrz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lyr7vTrz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4526C1F00893; Wed, 20 May 2026 08:50:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779267053; bh=dUGv8oIgE91WwfwK6ezX3xvVxWVU55LwkhTCXk2cXTo=; h=From:To:Cc:Subject:Date; b=lyr7vTrzuEUPWYUQ1jyu+OJJxxIVAGUJcGTeWIUwu3vddGICaHXpzg9T3BiSnU50T MtXziZRZWx/SPAc9D9F42VyHthyOkdUPnbEdaao+2R3OBi2iP0tcTcAfs3bQ474Ikn Viy48D6BATML9M42plqZn1GdvEKAYSKYYDMTGY/XyjiuSP+Y6WSGo5DHzyib7g6g7x c0QMunuEebH8hZTdwnD5tnJPbFe6oIIQxlHCyDFDvyjhMQaIc5v1PmKra8jdDcQk+u UOPjDQQoapoIBC+yVngONgJO7ebB/H3UxH9nivfUvZ9toMLdAEbTyqSlfKXdRRxzd6 L23gHqJDnDclA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wPcdf-00000004Hno-0fBo; Wed, 20 May 2026 08:50:51 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Steffen Eiden , Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Mark Rutland , Will Deacon , Fuad Tabba Subject: [PATCH v2 0/2] KVM: arm64: nv: Reduce FP/SVE overhead on exception/exception return Date: Wed, 20 May 2026 09:50:34 +0100 Message-ID: <20260520085036.541666-1-maz@kernel.org> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, seiden@linux.ibm.com, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, mark.rutland@arm.com, will@kernel.org, tabba@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false This is the second version of this short series optimising away a lot of unnecessary FPSIMD/SVE context switch with NV. * From v1 [1]: - New commit message on patch #2 (Mark) - Additional comments and WARN_ON_ONCE() (Mark) If nobody screams, I'll stick that into -next. Thanks, M. [1] https://lore.kernel.org/r/20260512140755.3676306-1-maz@kernel.org Marc Zyngier (2): KVM: arm64: nv: Track L2 to L1 exception emulation KVM: arm64: nv: Don't save/restore FP register during a nested ERET or exception arch/arm64/include/asm/kvm_host.h | 3 ++- arch/arm64/kvm/emulate-nested.c | 4 ++++ arch/arm64/kvm/fpsimd.c | 23 +++++++++++++++++++++++ 3 files changed, 29 insertions(+), 1 deletion(-) -- 2.47.3