linux-kernel - [PATCH v4 06/27] KVM: arm64: Pay attention to FFR parameter in SVE save and load

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: <20250214-kvm-arm64-sme-v4-6-d64a681adcc2@kernel.org>
Date: Fri, 14 Feb 2025 01:57:49 +0000
From: Mark Brown <broonie@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
 Joey Gouly <joey.gouly@....com>, Catalin Marinas <catalin.marinas@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, Will Deacon <will@...nel.org>, 
 Paolo Bonzini <pbonzini@...hat.com>, Jonathan Corbet <corbet@....net>, 
 Shuah Khan <shuah@...nel.org>
Cc: Dave Martin <Dave.Martin@....com>, Fuad Tabba <tabba@...gle.com>, 
 Mark Rutland <mark.rutland@....com>, linux-arm-kernel@...ts.infradead.org, 
 kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH v4 06/27] KVM: arm64: Pay attention to FFR parameter in SVE
 save and load

The hypervisor copies of the SVE save and load functions are prototyped
with third arguments specifying FFR should be accessed but the assembly
functions overwrite whatever is supplied to unconditionally access FFR.
Remove this and use the supplied parameter.

This has no effect currently since FFR is always present for SVE but will
be important for SME.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 arch/arm64/kvm/hyp/fpsimd.S | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S
index e950875e31cee4df58d041519b7584356463c91b..6e16cbfc5df27e63732655dffea60d7039c37332 100644
--- a/arch/arm64/kvm/hyp/fpsimd.S
+++ b/arch/arm64/kvm/hyp/fpsimd.S
@@ -21,13 +21,11 @@ SYM_FUNC_START(__fpsimd_restore_state)
 SYM_FUNC_END(__fpsimd_restore_state)
 
 SYM_FUNC_START(__sve_restore_state)
-	mov	x2, #1
 	sve_load 0, x1, x2, 3
 	ret
 SYM_FUNC_END(__sve_restore_state)
 
 SYM_FUNC_START(__sve_save_state)
-	mov	x2, #1
 	sve_save 0, x1, x2, 3
 	ret
 SYM_FUNC_END(__sve_save_state)

-- 
2.39.5