From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Subject: [PATCH 0/2] vapic: confine the VAPIC region to 0xc0000..0xe0000
Date: Wed, 26 Aug 2026 20:15:48 +0200 [thread overview]
Message-ID: <20260826181552.848617-1-pbonzini@redhat.com> (raw)
The VAPIC region is mapped as writable RAM, at very high priority,
above existing memory. If the guest is allowed to map it everywhere,
it can overlap PCI BARs or even SMRAM. Ensure that the whole
region first in the 128K of low memory that are reserved to
option ROMs.
Patch 1 is a separate bugfix that I noticed while working on
this area, while patch 2 is the actual fix.
Paolo Bonzini (2):
i386/vapic: unref MemoryRegion if vapic_map_rom_writable fails
vapic: confine the VAPIC region to 0xc0000..0xe0000
hw/i386/vapic.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
--
2.55.0
next reply other threads:[~2026-08-26 18:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-26 18:15 Paolo Bonzini [this message]
2026-08-26 18:15 ` [PATCH 1/2] i386/vapic: unref MemoryRegion if vapic_map_rom_writable fails Paolo Bonzini
2026-08-27 9:05 ` Philippe Mathieu-Daudé
2026-08-26 18:15 ` [PATCH 2/2] vapic: confine the VAPIC region to 0xc0000..0xe0000 Paolo Bonzini
2026-08-26 18:58 ` Philippe Mathieu-Daudé
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