From: Jan Beulich <jbeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: "Luca Fancellu" <luca.fancellu@arm.com>,
"Roger Pau Monné" <roger.pau@citrix.com>,
Xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH] x86/IDT: Fix IDT generation for INT $0x80
Date: Wed, 12 Mar 2025 09:49:22 +0100 [thread overview]
Message-ID: <cb7f086a-8a6d-4284-b85a-be88749757e0@suse.com> (raw)
In-Reply-To: <cdae37d8-a01d-412c-a48b-f4e27d7d898e@citrix.com>
On 11.03.2025 22:27, Andrew Cooper wrote:
> On 11/03/2025 9:22 pm, Andrew Cooper wrote:
>> When PV is enabled, entry_int80 needs to be DPL3, not DPL0.
>>
>> This causes the XSA-259 PoC to fail with:
>>
>> --- Xen Test Framework ---
>> Environment: PV 64bit (Long mode 4 levels)
>> XSA-259 PoC
>> Error: Unexpected fault 0x800d0802, #GP[IDT[256]]
>> Test result: ERROR
>>
>> (Clearly I have a bug in XTF's rendering of the error code too.)
>
> Fixes: 3da2149cf4dc ("x86/IDT: Generate bsp_idt[] at build time")
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Jan
next prev parent reply other threads:[~2025-03-12 8:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-11 21:22 [PATCH] x86/IDT: Fix IDT generation for INT $0x80 Andrew Cooper
2025-03-11 21:27 ` Andrew Cooper
2025-03-11 23:36 ` Andrew Cooper
2025-03-12 0:09 ` Andrew Cooper
2025-03-12 8:49 ` Jan Beulich [this message]
2025-03-11 22:16 ` Luca Fancellu
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