From mboxrd@z Thu Jan 1 00:00:00 1970 From: Olaf Hering Subject: [PATCH 09/12] xenpaging: prevent page-out of gfn 0x80 Date: Mon, 10 Jan 2011 17:43:54 +0100 Message-ID: <20110110164348.662846757@aepfle.de> References: <20110110164345.521919826@aepfle.de> Return-path: Content-Disposition: inline; filename=xen-unstable.xenpaging.realmode_gfn_0x80.patch List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Add a workaround for missing handling of paged-out pages during BIOS startup. For some reason, only gfn 0x80 is affected. (XEN) HVM3: HVM Loader (XEN) traps.c:649:d3 Bad GMFN 80 (MFN ffffffffff) to MSR 40000000 (XEN) HVM3: Detected Xen v4.1 (XEN) HVM3: HVMLoader bug at util.c:604 (XEN) hvm.c:1085:d3 Triple fault on VCPU0 - invoking HVM system reset. (XEN) HVM4: HVM Loader (XEN) traps.c:649:d4 Bad GMFN 80 (MFN ffffffffff) to MSR 40000000 (XEN) io.c:194:d4 MMIO emulation failed @ 0018:9ffff: 00 6a 10 80 c4 82 (XEN) hvm.c:1085:d4 Triple fault on VCPU0 - invoking HVM system reset. Signed-off-by: Olaf Hering --- Another part of the bugfix is the missing p2m_mem_paging_populate() call in gfn_to_mfn() tools/xenpaging/policy_default.c | 3 +++ 1 file changed, 3 insertions(+) --- xen-unstable.hg-4.1.22571.orig/tools/xenpaging/policy_default.c +++ xen-unstable.hg-4.1.22571/tools/xenpaging/policy_default.c @@ -76,6 +76,9 @@ int policy_init(xenpaging_t *paging) /* Don't page out page 0 */ set_bit(0, bitmap); + /* this is the trap page, disabled for the time being */ + set_bit(0x80, bitmap); + out: return rc; }