linux-kernel - Re: [PATCH v3 03/14] KVM: selftests: Return a value from vcpu_get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <39ea24d8-9dae-447a-ae37-e65878c3806f@sirena.org.uk>
Date: Fri, 1 Nov 2024 13:07:57 +0000
From: Mark Brown <broonie@...nel.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
	Anup Patel <anup@...infault.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Andrew Jones <ajones@...tanamicro.com>,
	James Houghton <jthoughton@...gle.com>,
	David Woodhouse <dwmw@...zon.co.uk>, linux-next@...r.kernel.org
Subject: Re: [PATCH v3 03/14] KVM: selftests: Return a value from
 vcpu_get_reg() instead of using an out-param

On Wed, Oct 09, 2024 at 08:49:42AM -0700, Sean Christopherson wrote:
> Return a uint64_t from vcpu_get_reg() instead of having the caller provide
> a pointer to storage, as none of the vcpu_get_reg() usage in KVM selftests
> accesses a register larger than 64 bits, and vcpu_set_reg() only accepts a
> 64-bit value.  If a use case comes along that needs to get a register that
> is larger than 64 bits, then a utility can be added to assert success and
> take a void pointer, but until then, forcing an out param yields ugly code
> and prevents feeding the output of vcpu_get_reg() into vcpu_set_reg().

This commit, which is in today's -next as 5c6c7b71a45c9c, breaks the
build on arm64:

aarch64/psci_test.c: In function ‘host_test_system_off2’:
aarch64/psci_test.c:247:9: error: too many arguments to function ‘vcpu_get_reg’
  247 |         vcpu_get_reg(target, KVM_REG_ARM_PSCI_VERSION, &psci_version);
      |         ^~~~~~~~~~~~
In file included from aarch64/psci_test.c:18:
include/kvm_util.h:705:24: note: declared here
  705 | static inline uint64_t vcpu_get_reg(struct kvm_vcpu *vcpu, uint64_t id)
      |                        ^~~~~~~~~~~~
At top level:
cc1: note: unrecognized command-line option ‘-Wno-gnu-variable-sized-type-not-at
-end’ may have been intended to silence earlier diagnostics

since the updates done to that file did not take account of 72be5aa6be4
("KVM: selftests: Add test for PSCI SYSTEM_OFF2") which has been merged
in the kvm-arm64 tree.

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)