linux-kernel - Re: [RFC] AMD VM crashing on deferred memory error injection

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Message-ID: <20260209173619.GCaYobE1nME_z-1z2U@fat_crate.local>
Date: Mon, 9 Feb 2026 18:36:19 +0100
From: Borislav Petkov <bp@...en8.de>
To: William Roche <william.roche@...cle.com>
Cc: "Ghannam, Yazen" <Yazen.Ghannam@....com>,
	Tony Luck <tony.luck@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
	"Allen, John" <John.Allen@....com>, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jane Chu <jane.chu@...cle.com>
Subject: Re: [RFC] AMD VM crashing on deferred memory error injection

On Mon, Feb 09, 2026 at 05:36:32PM +0100, William Roche wrote:
> An AMD Qemu VM running this kernel is no longer able to deal with the
> injection of a deferred memory error, and crashes with:
> 
> [  333.420854] mce: MSR access error: WRMSR to 0xc0002098 (tried to write
> 0x0000000000000000) at rIP: 0xffffffff8229894d (mce_wrmsrq+0x1d/0x60)
> [  333.428105] Call Trace:

Works as advertized - KVM is not allowing the MSR write.

This enablement is not meant for VM use. Why do we care about injecting hw
errors in a guest?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette