search for: physmap

Greetings, Currently, as I understand PV memory allocation, the Guest''s pfn -> mfn physmap will get populated on-demand as the guest uses more an more of its memory reservation. Is it possible to also make this go in the reverse direction? For example: let''s say we have a guest that is mostly idle and has a great deal of free memory and we decide to balloon down the domain. In...

I have two dell servers running arch linux and xen 4.3 One of them had after installing lates xen 4.3 had been showing this error message" failed to add gnttab to physmap " I reverted back to git pull from 02/17/13 and virtual machines start fine. Can sommone point me in righ direction what could be causing the error message _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users

On Tue, Jun 23, 2020 at 12:51:03PM +0100, Andrew Cooper wrote: > There are cases which are definitely non-recoverable. > > For both ES and SNP, a malicious hypervisor can mess with the guest > physmap to make the the NMI, #VC and #DF stacks all alias. > > For ES, this had better result in the #DF handler deciding that crashing > is the way out, whereas for SNP, this had better escalate to Shutdown. > Crashing out hard if the hypervisor is misbehaving is acceptable. Then I'm th...

...int64_t)0, ~(uint64_t)0}, means invalid + (pfn, gmfn) and the corresponding page has zero. There might + exist invalid (pfn, gmfn)''s at the end part of this array. This section must exist when the domain is non auto translated physmap mode. Currently x86 paravirtualized domain. @@ -94,6 +97,9 @@ Currently the following sections are def The size of arrays is stored in xch_nr_pages member of header note descriptor in .note.Xen note section. The entries are stored in ascending or...

...with auto translated mode enabled (i.e. on ia64) because - bus address space(dma_addr_t) is different from machine address space(maddr_t). With the terminology in xen/include/public/mm.h, dma_addr_t is maddr and maddr_t is gmaddr. So they should be handled differently with auto translated physmap mode enabled. - dma address conversion depends on dma api implementation and its paravirtualization. "pfn_valid(mfn_to_local_pfn(maddr >> PAGE_SHIFT)" check in gnttab_dma_map_page() doesn''t make sense with auto translate physmap mode enabled. To address those is...

...9;': ''1'', ''cpu/0/availability'': ''online'', ''image/features/pae-pgdir-above-4gb'': ''1'', ''image/features/writable-page-tables'': ''1'', ''image/features/auto-translated-physmap'': ''1'', ''name'': ''VM1'', ''domid'': ''6'', ''image/xen-version'': ''xen-3.0'', ''store/port'': ''1''} [2007-06-06 12:49:44 32539] DEBUG (__ini...

...39;', ''image'': "(linux (kernel /boot/vmlinuz-xen) (ramdisk /boot/initrd-xen) (args ''root=/dev/sda2 ro ip=10.0.27.2:1.2.3.4::255.254.0.0::eth0:off xencons=tty1 3'') (notes (FEATURES ''writable_page_tables|writable_descriptor_tables|auto_translated_physmap |pae_pgdir_above_4gb|supervisor_mode_kernel'') (VIRT_BASE -2147483648) (GUEST_VERSION 2.6) (PADDR_OFFSET -2147483648) (GUEST_OS linux) (HYPERCALL_PAGE -2145361920) (LOADER generic) (SUSPEND_CANCEL 1) (ENTRY -2145386496) (XEN_VERSION xen-3.0)))", ''name'': ''xen0...

...9;: ''online'', ''image/features/pae-pgdir-above-4 gb'': ''1'', ''image/features/writable-page-tables'': ''1'', ''console/type'': ''xenconsoled'', ''image/features/auto-translated-physmap'': ''1'', ''name'': ''tpccExpt-remus'', ''domid'': ''6'', ''image/xen-version'': ''xen-3.0'', ''store/port'': ''1''} [2010-09-06 21:38:16 2392] DE...

On Tue, Jun 23, 2020 at 01:07:06PM +0200, Peter Zijlstra wrote: > On Tue, Apr 28, 2020 at 09:55:12AM +0200, Joerg Roedel wrote: > So what happens if this #VC triggers on the first access to the #VC > stack, because the malicious host has craftily mucked with only the #VC > IST stack page? > > Or on the NMI IST stack, then we get #VC in NMI before the NMI can fix > you up.

...ory size may be set by the kernel environment variable * hw.physmem or the compile-time define MAXMEM. - * - * XXX first should be vm_paddr_t. */ static void getmemsize(int first) @@ -1433,8 +1426,8 @@ u_int basemem, extmem; struct vm86frame vmf; struct vm86context vmc; - vm_paddr_t pa, physmap[PHYSMAP_SIZE]; - pt_entry_t *pte; + vm_offset_t pa, physmap[PHYSMAP_SIZE]; + pt_entry_t pte; const char *cp; struct { u_int64_t base; @@ -1490,7 +1483,7 @@ */ for (pa = trunc_page(basemem * 1024); pa < ISA_HOLE_START; pa += PAGE_SIZE) { - pte = vtopte(pa + KERNBASE); + pte =...

...could be generic however I do not know it will be useful for others. If this function would be accepted by mm/memory_hotplug.c maintainers we could move it there. I removed from original add_memory funtion resource allocation (and deallocation after error), which must be done before XENMEM_populate_physmap in Xen. xen_add_memory is called after physmap is fully populated. If you have a questions please drop me a line. Daniel Signed-off-by: Daniel Kiper <dkiper@net-space.pl> --- arch/x86/Kconfig | 2 +- drivers/base/memory.c | 23 --- drivers/xen/Kconfig...

...;: ''1'', ''cpu/0/availability'': ''online'', ''image/features/pae-pgdir-above-4gb'': ''1'', ''image/features/writable-page-tables'': ''1'', ''image/features/auto-translated-physmap'': ''1'', ''name'': ''migrating-Etch'', ''domid'': ''1'', ''image/xen-version'': ''xen-3.0'', ''store/port'': ''1''} [2007-08-13 16:53:18 3247]...

...ny PERARD (2): xen mapcache: check if memory region has moved. xen: do not allocate RAM during INMIGRATE runstate Stefano Stabellini (4): cirrus_vga: do not reset videoram Introduce "xen-save-devices-state" Set runstate to INMIGRATE earlier xen: record physmap changes to xenstore docs/xen-save-devices-state.txt | 34 +++++++++++++ hw/cirrus_vga.c | 4 -- qapi-schema.json | 19 +++++++ qmp-commands.hx | 27 ++++++++++ savevm.c | 71 ++++++++++++++++++++++++++ vl.c...

...yet with this patch-set. When it gets enabled a stack > recursion check in the #VC handler is needed which panics the VM. That > also fixes the #VC-in-early-NMI problem. There are cases which are definitely non-recoverable. For both ES and SNP, a malicious hypervisor can mess with the guest physmap to make the the NMI, #VC and #DF stacks all alias. For ES, this had better result in the #DF handler deciding that crashing is the way out, whereas for SNP, this had better escalate to Shutdown. What matters here is the security model in SNP.? The hypervisor is relied upon for availability (beca...

...0000000000000000->00000000ff000000 ENTRY ADDRESS: 0000000000100000 xc: info: PHYSICAL MEMORY ALLOCATION: 4KB PAGES: 0x0000000000000200 2MB PAGES: 0x00000000000003f7 1GB PAGES: 0x0000000000000002 xc: error: panic: xc_dom_boot.c:388: xc_dom_gnttab_hvm_seed: failed to add gnttab to physmap [errno=22] : Internal error libxl: error: libxl_dm.c:1218:device_model_spawn_outcome: domain 1 device model: spawn failed (rc=-3) libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: /etc/xen/scripts/vif-bridge add [4567] exited with error status 1 libxl: error: libxl_create.c:1116:domcrea...

As you know, HVM save/restore broke recently because restored config miss guest memsize that used by xc_hvm_restore to locate some pfn. After discussion, we decided to remove the pfn deduction logic from restore side by adding a general memory layout. I have a patch for it. But then qemu broke, because it also require the memsize to locate the share page. We can''t use the previous

Hello all Xen devels, I''m writing howto''s in brazilian portuguese language about Xen-3.3.0 stubdom, pv-grub and others configurations. Following what is written in xen-3.3.0/stubdom/README, I tried start a HVM but without success. When I start the virtual machine calling ''xm create hvmtest'' command, in a few seconds the virtual machine is dead (see

...9;: ''1'', ''image'': "(linux (kernel /boot/vmlinuz-2.6.24-22-xen) (ramdisk /boot/initrd.img-2.6.24-22-xen) (args ''root=/dev/xvda2 ro 2 console=xvc0'') (notes (FEATURES ''writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel'') (VIRT_BASE 18446744071562067968) (GUEST_VERSION 2.6) (PADDR_OFFSET 18446744071562067968) (GUEST_OS linux) (HYPERCALL_PAGE 18446744071564197888) (LOADER generic) (SUSPEND_CANCEL 1) (ENTRY 18446744071564165120) (XEN_VERSION xen-3.0)))", &...

...us'': ''1'', ''vcpu_avail'': ''1'', ''image'': "(linux (kernel /boot/vmlinuz-2.6-xen) (args ''root=/dev/hda1 '') (notes (FEATURES ''writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel'') (VIRT_BASE 18446744071562067968) (GUEST_VERSION 2.6) (PADDR_OFFSET 18446744071562067968) (GUEST_OS linux) (HYPERCALL_PAGE 18446744071564189696) (LOADER generic) (ENTRY 18446744071564165120) (XEN_VERSION xen-3.0)))", ''name'&...

...us'': ''1'', ''vcpu_avail'': ''1'', ''image'': "(linux (kernel /boot/vmlinuz-2.6-xen) (args ''root=/dev/hda1 '') (notes (FEATURES ''writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel'') (VIRT_BASE 18446744071562067968) (GUEST_VERSION 2.6) (PADDR_OFFSET 18446744071562067968) (GUEST_OS linux) (HYPERCALL_PAGE 18446744071564189696) (LOADER generic) (SUSPEND_CANCEL 1) (ENTRY 18446744071564165120) (XEN_VERSION xen-3.0)))", &...