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From: Wei Liu <wei.liu@kernel.org>
To: Qiliang Yuan <odys.yuan@gmail.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
	Long Li <longli@microsoft.com>,
	linux-hyperv@vger.kernel.org
Subject: Re: [PATCH] KVM: x86: Clear CR3[63:32] on SMM entry from long mode
Date: Mon, 28 Sep 2026 10:42:43 -0700	[thread overview]
Message-ID: <20260928174243.GA3705413@liuwe-devbox-debian-v2.local> (raw)
In-Reply-To: <20260928072534.1987-1-odys.yuan@gmail.com>

Hi Qiliang

On Mon, Sep 28, 2026 at 03:25:34PM +0800, Qiliang Yuan wrote:
> +Cc Hyper-V folks and linux-hyperv, since the failure is triggered by
> Hyper-V's handling of VMRUN for a nested (L1) hypervisor, i.e. KVM
> running on WSL2.
> 
> For the Hyper-V side: the VMRUN is rejected when the guest state has
> CR0.PG=0, EFER.LMA=0 and CR3[63:32] != 0, a combination that bare-metal
> SVM does not reject.  Is that check intentional?  If it is not, a
> Hyper-V fix would help older KVM versions as well; either way the patch
> avoids creating that state in the first place.
> 
> The full patch is here:
> https://lore.kernel.org/r/20260928-kvm-smm-cr3-upper-bits-v1-1-138f52dd531e@gmail.com

Please share the Windows version from `winver`.

My colleague said that it had been fixed. Maybe the change needs to be ported.

Thanks,
Wei

> 
> Thanks,
> Qiliang

  reply	other threads:[~2026-09-28 17:42 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-28  7:05 Qiliang Yuan
2026-09-28  7:25 ` Qiliang Yuan
2026-09-28 17:42   ` Wei Liu [this message]
2026-09-28 18:19     ` Sean Christopherson
2026-09-29  0:57       ` Qiliang Yuan

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