similar to: [PATCH v2 2/2] m2p_find_override: use list_for_each_entry_safe

(This is a continuation of "[PATCH v9] xen/grant-table: Avoid m2p_override during mapping") The grant mapping API does m2p_override unnecessarily: only gntdev needs it, for blkback and future netback patches it just cause a lock contention, as those pages never go to userspace. Therefore this series does the following: - the bulk of the original function (everything after the mapping

(This is a continuation of "[PATCH v9] xen/grant-table: Avoid m2p_override during mapping") The grant mapping API does m2p_override unnecessarily: only gntdev needs it, for blkback and future netback patches it just cause a lock contention, as those pages never go to userspace. Therefore this series does the following: - the bulk of the original function (everything after the mapping

This patch is a significant performance improvement for the m2p_override: about 6% using the gntdev device. Each m2p_add/remove_override call issues a MULTI_grant_table_op and a __flush_tlb_single if kmap_op != NULL. Batching all the calls together is a great performance benefit because it means issuing one hypercall total rather than two hypercall per page. If paravirt_lazy_mode is set

Hey, Linus released this Saturday v3.5 and there were quite a few of interesting components/fixes/features that went in! Going to go down the list of what shortlog provided: - Less MSR traps when using AMD machines - so better performance. [andre] - The APIC IPI interface works - which means that ''perf'' in the initial domain works. So no more lockups. Also with some

From: Matt Wilson <msw@amazon.com> Commit f62805f1 introduced a bug where lazy MMU mode isn''t exited if a m2p_add/remove_override call fails. Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Anthony

Replace list_for_each_entry() by list_for_each_entry_safe() in __btrfs_close_devices() list_for_each_entry() { list_replace_rcu(); call_rcu(); <-- We may free the device, if we get next device by the current one, the page fault may happen. } Signed-off-by: Azat Khuzhin

On 27/02/14 15:55, Zoltan Kiss wrote: > (This is a continuation of "[PATCH v9] xen/grant-table: Avoid m2p_override > during mapping") > > The grant mapping API does m2p_override unnecessarily: only gntdev needs it, > for blkback and future netback patches it just cause a lock contention, as > those pages never go to userspace. Therefore this series does the following:

> # HG changeset patch > # User George Dunlap <george.dunlap@eu.citrix.com> > # Date 1340815812 -3600 > # Node ID ea827c449088a1017b6e5a9564eb33df70f8a9c6 > # Parent b4e1fec1c98f6cbad666a972f473854518c25500 > xen,pod: Zero-check recently populated pages (checklast) > > When demand-populating pages due to guest accesses, check recently > populated > pages to see

The VMID field is 8 bits. Rather than allowing only up to 256 VMs per host reboot before things start "acting strange" instead maintain a simple bitmap of used VMIDs and allocate them statically to guests upon creation. This limits us to 256 concurrent VMs which is a reasonable improvement. Eventually we will want a proper scheme to allocate VMIDs on context switch. The existing code

Add hypercall (shadow op: enable/disable and clean/peek dirtied page bitmap). It consists of two parts: dirty page detecting and saving. For detecting, we setup the guest p2m''s leaf PTE read-only and whenever the guest tries to write something, permission fault happens and traps into xen. The permission-faulted GPA should be saved for the toolstack (when it wants to see which pages

Commit 90805dc (c/s 26387:4056e5a3d815) ("EPT: Make ept data stucture or operations neutral") makes nested p2m tables be unlinked from the host p2m table before their destruction (in p2m_teardown_nestedp2m). However, by this time the host p2m table has already been torn down, leading to a possible race condition where another allocation between the two kinds of table being torn down can

Hi, Olaf we have tested the xenpaging feature and found some problems. (1) the test case like this : when we start a VM with POD enable, the xenpaging is started at the same time. this case will cause many problems ,finally, we fixed the BUG, the patch is attached below. (2) there is a very serious problem. we have observed many VM crash examples, the error code is not always the same.

Since when we are using the m2p_override it is not true anymore that the mmap''ed area doesn''t have corresponsing struct pages. Removing the VM_PFNMAP flag makes get_user_pages work on the mmap''ed user vma. An example test case would be using a Xen userspace block backend (QDISK) on a file on NFS using O_DIRECT. The patch should be backported back to 2.6.38.

We would the full P2M top directory from 0->MAX_DOMAIN_PAGES (inclusive). Which meant that if the kernel was compiled with MAX_DOMAIN_PAGES=512 we would try to use the 512th entry. Fortunately for us the p2m_top_index has a check for this: BUG_ON(pfn >= MAX_P2M_PFN); which we hit and saw this: (XEN) domain_crash_sync called from entry.S (XEN) Domain 0 (vcpu#0) crashed on cpu#0: (XEN)

Yang, Fred wrote: > Dan, > >> From Xen summit, isn''t it to be more P2M liked approach due to > consideration on driver domain and domain0 needs to get P2M for > VBD/VNIF? > > Don''t remember there is decision on taking Hypercall only approach and > dropped P2M table lookup. Any justification here? To me having an array like x86 xenlinux is much

Not just dom0. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> --- xen/arch/arm/domain.c | 3 +++ xen/arch/arm/domain_build.c | 3 --- xen/arch/arm/p2m.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c index 5702399..4b38790 100644 --- a/xen/arch/arm/domain.c +++ b/xen/arch/arm/domain.c @@

This fixes a bug in changeset 22526:7a5ee3800417, where the wrong value is read when deciding whether to flush the VTd tables. The effect is minor: in situations where the p2m entry is changed but the mfn is the same, the VTd tables will be unnecessarily flushed. old_entry is left untouched in the second case, since having a present old_entry will cause the an unnecessary check to be taken at

CC''ing Tim and xen-devel On Mon, 18 Jul 2011, Jiageng Yu wrote: > 2011/7/16 Stefano Stabellini <stefano.stabellini@eu.citrix.com>: > > On Fri, 15 Jul 2011, Jiageng Yu wrote: > >> 2011/7/15 Jiageng Yu <yujiageng734@gmail.com>: > >> > 2011/7/15 Stefano Stabellini <stefano.stabellini@eu.citrix.com>: > >> >> On Fri, 15 Jul 2011,

[PATCH 6/8] HVM save restore: guest memory handling Signed-off-by: Zhai Edwin <edwin.zhai@intel.com> add support for save/restore HVM guest memory diff -r bb1c450b2739 tools/libxc/xc_hvm_restore.c --- a/tools/libxc/xc_hvm_restore.c Thu Jan 11 21:03:11 2007 +0800 +++ b/tools/libxc/xc_hvm_restore.c Thu Jan 11 21:05:45 2007 +0800 @@ -31,6 +31,40 @@ #include <xen/hvm/ioreq.h>

Hi all, Here I am sending as attachments patches enabling kexec/kdump support in Xen PV domU. Only x84_64 architecture is supported. There is no support for i386 but some code could be easily reused. Here is a description of patches: - kexec-tools-2.0.3_20120522.patch: patch for kexec-tools which cleanly applies to version 2.0.3, - kexec-kernel-only_20120522.patch: main kexec/kdump kernel