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From: Oliver Upton <oupton@kernel.org>
To: Marc Zyngier <maz@kernel.org>,
	kvmarm@lists.linux.dev,
	Karl Mehltretter <kmehltretter@gmail.com>
Cc: Oliver Upton <oupton@kernel.org>,
	Joey Gouly <joey.gouly@arm.com>,
	Steffen Eiden <seiden@linux.ibm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Fuad Tabba <fuad.tabba@linux.dev>
Subject: Re: [PATCH] KVM: arm64: Fix AArch32 DBGBXVR<n> handling
Date: Sat, 19 Sep 2026 11:11:14 -0700
Message-ID: <178984145401.38162.12449211285441501967.b4-ty@kernel.org>
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On Mon, 10 Aug 2026 02:56:16 +0200, Karl Mehltretter wrote:
> The consolidation of the breakpoint and watchpoint register accessors
> switched DBGBXVR<n> from trap_bvr() to trap_dbg_wb_reg(). The latter
> selects backing storage with demux_wb_reg(), which only handles Op2 values
> 4 through 7. Since DBGBXVR<n> uses Op2 1, an AArch32 guest access hits
> KVM_BUG_ON() and marks the VM dead.
> 
> DBGBXVR<n> aliases DBGBVR<n>_EL1[63:32], and its AA32(HI) descriptor
> already selects the upper half. Map Op2 1 to dbg_bvr[] alongside Op2 4,
> restoring the pre-regression behavior.
> 
> [...]

Thanks for pinging, this slipped between the cracks.

Applied to fixes, thanks!

[1/1] KVM: arm64: Fix AArch32 DBGBXVR<n> handling
      https://git.kernel.org/kvmarm/kvmarm/c/239763bda716

--
Best,
Oliver