From: Joerg Roedel <jroedel@suse.de>
To: Pu Wen <puwen@hygon.cn>
Cc: Sean Christopherson <seanjc@google.com>,
x86@kernel.org, joro@8bytes.org, thomas.lendacky@amd.com,
dave.hansen@linux.intel.com, peterz@infradead.org,
tglx@linutronix.de, mingo@redhat.com, bp@suse.de, hpa@zytor.com,
sashal@kernel.org, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] x86/sev: Check whether SEV or SME is supported first
Date: Mon, 31 May 2021 11:37:08 +0200 [thread overview]
Message-ID: <YLSuRBzM6piigP8t@suse.de> (raw)
In-Reply-To: <905ecd90-54d2-35f1-c8ab-c123d8a3d9a0@hygon.cn>
On Thu, May 27, 2021 at 11:08:32PM +0800, Pu Wen wrote:
> Reading MSR_AMD64_SEV which is not implemented on Hygon Dhyana CPU will cause
> the kernel reboot, and native_read_msr_safe() has no help.
The reason for the reboot is that there is no #GP or #DF handler set up
when this MSR is read, so its propagated to a shutdown event. But there
is an IDT already, so you can set up early and #GP handler to fix the
reboot.
Regards,
Joerg
next prev parent reply other threads:[~2021-05-31 9:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-26 7:24 [PATCH] x86/sev: Check whether SEV or SME is supported first Pu Wen
2021-05-26 17:27 ` Sean Christopherson
2021-05-27 15:08 ` Pu Wen
2021-05-31 9:37 ` Joerg Roedel [this message]
2021-05-31 14:56 ` Pu Wen
2021-06-01 14:39 ` Borislav Petkov
2021-06-01 16:14 ` Sean Christopherson
2021-06-01 16:36 ` Tom Lendacky
2021-06-01 16:59 ` Borislav Petkov
2021-06-01 17:16 ` Sean Christopherson
2021-06-01 17:48 ` Borislav Petkov
2021-06-01 18:08 ` Sean Christopherson
2021-06-01 18:24 ` Borislav Petkov
2021-06-01 17:09 ` Sean Christopherson
2021-06-01 18:30 ` Tom Lendacky
2021-06-02 6:55 ` Wen Pu
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