From patchwork Tue Aug 20 13:17:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13770096 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 447F8C3DA4A for ; Tue, 20 Aug 2024 13:21:09 +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-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=vbzza0xht3HzzpvQjIL1Q/FmbuTwdvu0auIiInyQ0Fw=; b=Gz90SE+/ARGrUqqDQTVT0bLJ0Z VqoKTdOAu9l4sxK+dME3qH4UOnTrliwhGpZwrFvzZWGLQ0+c3lkfkPN/B7bTVCuNljS/YF6Jp5Yqy +YUgN1B0JfWKINc2I8ThlHfRFLjjXFih/XokIDks2+RoeR0eW+xtDkNq+2XmUakX+y+76w0c4hZz5 /b/CrLBFfL2QlqQsynTXG8DVOJk7k6xfS9YWnUqm9aUWkbS0ZveqfgPqU3IC/j1roh7piqK9JSYLE Hg09lkRRcau2vSjHrJgFqqdILO/pNu2ieIBMC9f0meacHglBGCih8D0sTSO+HE68pnoYTKJvNrkk7 6N3a7iaQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgOnB-00000005KV8-1I18; Tue, 20 Aug 2024 13:20:57 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgOkT-00000005Jhb-3doz for linux-arm-kernel@lists.infradead.org; Tue, 20 Aug 2024 13:18:12 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id ECB0A60C87; Tue, 20 Aug 2024 13:18:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9AA96C4AF15; Tue, 20 Aug 2024 13:18:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724159888; bh=ylseVtY/pFsGoRuZ5WCChTIFVOMphVkrvy0UVfUuz4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PvDp7Zpvayxs9ybj1+ApH9bth57A5Dha79eruofDcnkPKyMjvFJ5PMVOoCmvOX5d1 umuT1e0hFl5OraP0ZV/i2U/6KHVTKLE1JeOURa2Li3Q6Q3F8eU93JGPo91+1X5fYLG PajcHef49BdmpBFmE1wHDh+PaTv9Zt2tdqdYZVVxU2pC4BzllZC4X+O+YMBat7mFbC Q+G7O38DVjDxmWs/MUwwzKyBQoQeAOHAG4y/p9K5jTNoRu9OCo+tEbk2Crz6PxWXX2 Byo1XFA1MAFNEhdNcP9yvvG/WNg2IatRIODrK2JVuToNiWYCiXhQow7LwVDk2q9WQw ObR9DdvtsQAIg== 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 4.95) (envelope-from ) id 1sgOkQ-005HMQ-Pn; Tue, 20 Aug 2024 14:18:06 +0100 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Fuad Tabba , Joey Gouly , Mark Brown Subject: [PATCH v4 4/8] KVM: arm64: Add save/restore support for FPMR Date: Tue, 20 Aug 2024 14:17:58 +0100 Message-Id: <20240820131802.3547589-5-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240820131802.3547589-1-maz@kernel.org> References: <20240820131802.3547589-1-maz@kernel.org> MIME-Version: 1.0 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, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com, tabba@google.com, joey.gouly@arm.com, broonie@kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240820_061810_073288_74A0BA48 X-CRM114-Status: GOOD ( 18.72 ) 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 Just like the rest of the FP/SIMD state, FPMR needs to be context switched. The only interesting thing here is that we need to treat the pKVM part a bit differently, as the host FP state is never written back to the vcpu thread, but instead stored locally and eagerly restored. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_host.h | 10 ++++++++++ arch/arm64/kvm/fpsimd.c | 1 + arch/arm64/kvm/hyp/include/hyp/switch.h | 3 +++ arch/arm64/kvm/hyp/nvhe/hyp-main.c | 9 +++++++++ arch/arm64/kvm/hyp/nvhe/switch.c | 9 +++++++++ arch/arm64/kvm/hyp/vhe/switch.c | 3 +++ 6 files changed, 35 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 021f7a1845f2..a6b684c08fe7 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -599,6 +599,16 @@ struct kvm_host_data { struct cpu_sve_state *sve_state; }; + union { + /* HYP VA pointer to the host storage for FPMR */ + u64 *fpmr_ptr; + /* + * Used by pKVM only, as it needs to provide storage + * for the host + */ + u64 fpmr; + }; + /* Ownership of the FP regs */ enum { FP_STATE_FREE, diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c index 4cb8ad5d69a8..ea5484ce1f3b 100644 --- a/arch/arm64/kvm/fpsimd.c +++ b/arch/arm64/kvm/fpsimd.c @@ -63,6 +63,7 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) */ *host_data_ptr(fp_owner) = FP_STATE_HOST_OWNED; *host_data_ptr(fpsimd_state) = kern_hyp_va(¤t->thread.uw.fpsimd_state); + *host_data_ptr(fpmr_ptr) = kern_hyp_va(¤t->thread.uw.fpmr); vcpu_clear_flag(vcpu, HOST_SVE_ENABLED); if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN) diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index f59ccfe11ab9..84a135ba21a9 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -404,6 +404,9 @@ static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code) else __fpsimd_restore_state(&vcpu->arch.ctxt.fp_regs); + if (kvm_has_fpmr(kern_hyp_va(vcpu->kvm))) + write_sysreg_s(__vcpu_sys_reg(vcpu, FPMR), SYS_FPMR); + /* Skip restoring fpexc32 for AArch64 guests */ if (!(read_sysreg(hcr_el2) & HCR_RW)) write_sysreg(__vcpu_sys_reg(vcpu, FPEXC32_EL2), fpexc32_el2); diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index f43d845f3c4e..87692b566d90 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -62,6 +62,8 @@ static void fpsimd_sve_flush(void) static void fpsimd_sve_sync(struct kvm_vcpu *vcpu) { + bool has_fpmr; + if (!guest_owns_fp_regs()) return; @@ -73,11 +75,18 @@ static void fpsimd_sve_sync(struct kvm_vcpu *vcpu) else __fpsimd_save_state(&vcpu->arch.ctxt.fp_regs); + has_fpmr = kvm_has_fpmr(kern_hyp_va(vcpu->kvm)); + if (has_fpmr) + __vcpu_sys_reg(vcpu, FPMR) = read_sysreg_s(SYS_FPMR); + if (system_supports_sve()) __hyp_sve_restore_host(); else __fpsimd_restore_state(*host_data_ptr(fpsimd_state)); + if (has_fpmr) + write_sysreg_s(*host_data_ptr(fpmr), SYS_FPMR); + *host_data_ptr(fp_owner) = FP_STATE_HOST_OWNED; } diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c index 6af179c6356d..c0832ca0285b 100644 --- a/arch/arm64/kvm/hyp/nvhe/switch.c +++ b/arch/arm64/kvm/hyp/nvhe/switch.c @@ -198,6 +198,15 @@ static void kvm_hyp_save_fpsimd_host(struct kvm_vcpu *vcpu) } else { __fpsimd_save_state(*host_data_ptr(fpsimd_state)); } + + if (kvm_has_fpmr(kern_hyp_va(vcpu->kvm))) { + u64 val = read_sysreg_s(SYS_FPMR); + + if (unlikely(is_protected_kvm_enabled())) + *host_data_ptr(fpmr) = val; + else + **host_data_ptr(fpmr_ptr) = val; + } } static const exit_handler_fn hyp_exit_handlers[] = { diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c index 77010b76c150..80581b1c3995 100644 --- a/arch/arm64/kvm/hyp/vhe/switch.c +++ b/arch/arm64/kvm/hyp/vhe/switch.c @@ -312,6 +312,9 @@ static bool kvm_hyp_handle_eret(struct kvm_vcpu *vcpu, u64 *exit_code) static void kvm_hyp_save_fpsimd_host(struct kvm_vcpu *vcpu) { __fpsimd_save_state(*host_data_ptr(fpsimd_state)); + + if (kvm_has_fpmr(vcpu->kvm)) + **host_data_ptr(fpmr_ptr) = read_sysreg_s(SYS_FPMR); } static bool kvm_hyp_handle_tlbi_el2(struct kvm_vcpu *vcpu, u64 *exit_code)