From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (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 8367E4642C for ; Mon, 8 Jan 2024 22:40:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="mzV24T3j" Date: Mon, 8 Jan 2024 22:40:11 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1704753617; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=sV+PpIDToi7juVBDElOBpigRJdTXhJIcPy3cI7W3KLY=; b=mzV24T3jxM9f7x1Ksg5iexqXQFZQxzkJhGxqXGgeAkvRL6AtmpfhjQ78c26hln0HLBvGNj 2/yGqbygekB/+NfAIGNmFS21gtJ7CAUwQNnR6jsRqpMX30bVp8dqjarlXD3sanZnp57X50 ebG+sBYil1Q+scejX79uKEZRdiZi5JY= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Oliver Upton To: Zenghui Yu Cc: Eric Auger , kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, Mark Brown , Jing Zhang , Suzuki K Poulose , James Morse , Marc Zyngier , Paolo Bonzini , Adrian Hunter , Ian Rogers , Namhyung Kim , Jiri Olsa , Alexander Shishkin , Mark Rutland , Arnaldo Carvalho de Melo , Ingo Molnar , Peter Zijlstra Subject: Re: [PATCH v3 5/5] KVM: arm64: selftests: Test for setting ID register from usersapce Message-ID: References: <20231011195740.3349631-1-oliver.upton@linux.dev> <20231011195740.3349631-6-oliver.upton@linux.dev> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT Hi Zenghui, On Fri, Jan 05, 2024 at 05:07:08PM +0800, Zenghui Yu wrote: > On 2023/10/19 16:38, Eric Auger wrote: > > > > +static const struct reg_ftr_bits ftr_id_aa64dfr0_el1[] = { > > > + S_REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64DFR0_EL1, PMUVer, 0), > > > > Strictly speaking this is not always safe to have a lower value. For > > instance: From Armv8.1, if FEAT_PMUv3 is implemented, the value 0b0001 > > is not permitted. But I guess this consistency is to be taken into > > account by the user space. But may be wort a comment. Here and below > > > > You may at least clarify what does mean 'safe' > > > > > + REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64DFR0_EL1, DebugVer, 0), > > I've seen the following failure on Cortex A72 where > ID_AA64DFR0_EL1.DebugVer is 6. Ah, yes, the test is wrong. KVM enforces a minimum value of 0x6 on this field, yet get_safe_value() returns 0x5 for the field. Jing, do you have time to check this test for similar failures and send out a fix for Zenghui's observations? > # ./aarch64/set_id_regs > TAP version 13 > 1..79 > ok 1 ID_AA64DFR0_EL1_PMUVer > ==== Test Assertion Failure ==== > include/kvm_util_base.h:553: !ret > pid=2288505 tid=2288505 errno=22 - Invalid argument > 1 0x0000000000402787: vcpu_set_reg at kvm_util_base.h:553 > (discriminator 6) > 2 (inlined by) test_reg_set_success at set_id_regs.c:342 > (discriminator 6) > 3 (inlined by) test_user_set_reg at set_id_regs.c:413 (discriminator > 6) > 4 0x0000000000401943: main at set_id_regs.c:475 > 5 0x0000ffffbdd5d03b: ?? ??:0 > 6 0x0000ffffbdd5d113: ?? ??:0 > 7 0x0000000000401a2f: _start at ??:? > KVM_SET_ONE_REG failed, rc: -1 errno: 22 (Invalid argument) -- Thanks, Oliver