search for: pgd_ctor

Hi, I have buit Xen (32 bit) with PAE and can start multiple Paraguests with 4 gig memory, but cannot launch a single VM with more than 4 gb memory. I would like to launch 1 VM with 30GB or so memory. Are there any config paramters like kernel,/inittrd that need to be changed. I have the ramdisk set to the initrd I used to boot xen with PAE. Thanks - padma

...a initrd issue. First 4.6 domU: kernel BUG at arch/i386/mm/pgtable-xen.c:306! invalid operand: 0000 [#1] SMP Modules linked in: md5 ipv6 sunrpc dm_mirror dm_mod xennet ext3 jbd xenblk CPU: 0 EIP: 0061:[<c011163a>] Not tainted VLI EFLAGS: 00010282 (2.6.9-55.0.12.ELxenU) EIP is at pgd_ctor+0x1d/0x26 eax: fffffff4 ebx: 00000000 ecx: f5392000 edx: 00000000 esi: c19fdd80 edi: e8f6a700 ebp: 00000001 esp: e0e45de4 ds: 007b es: 007b ss: 0068 Process crond (pid: 32004, threadinfo=e0e45000 task=eb4443f0) Stack: c0141bbd cc57b000 c19fdd80 00000001 cc57b000 e8f6a700 c19fdd80 c...

...a initrd issue. First 4.6 domU: kernel BUG at arch/i386/mm/pgtable-xen.c:306! invalid operand: 0000 [#1] SMP Modules linked in: md5 ipv6 sunrpc dm_mirror dm_mod xennet ext3 jbd xenblk CPU: 0 EIP: 0061:[<c011163a>] Not tainted VLI EFLAGS: 00010282 (2.6.9-55.0.12.ELxenU) EIP is at pgd_ctor+0x1d/0x26 eax: fffffff4 ebx: 00000000 ecx: f5392000 edx: 00000000 esi: c19fdd80 edi: e8f6a700 ebp: 00000001 esp: e0e45de4 ds: 007b es: 007b ss: 0068 Process crond (pid: 32004, threadinfo=e0e45000 task=eb4443f0) Stack: c0141bbd cc57b000 c19fdd80 00000001 cc57b000 e8f6a700 c19fdd80 c...

...; } Index: linux-2.6.13/arch/i386/mm/pgtable.c =================================================================== --- linux-2.6.13.orig/arch/i386/mm/pgtable.c 2005-08-24 09:31:05.000000000 -0700 +++ linux-2.6.13/arch/i386/mm/pgtable.c 2005-08-24 09:40:22.000000000 -0700 @@ -209,6 +209,7 @@ void pgd_ctor(void *pgd, kmem_cache_t *c if (PTRS_PER_PMD == 1) { memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); + SetPagePDE(virt_to_page(pgd)); spin_lock_irqsave(&pgd_lock, flags); } @@ -227,6 +228,7 @@ void pgd_dtor(void *pgd, kmem_cache_t *c { unsigned long flags; /* can be called fro...

...; } Index: linux-2.6.13/arch/i386/mm/pgtable.c =================================================================== --- linux-2.6.13.orig/arch/i386/mm/pgtable.c 2005-08-24 09:31:05.000000000 -0700 +++ linux-2.6.13/arch/i386/mm/pgtable.c 2005-08-24 09:40:22.000000000 -0700 @@ -209,6 +209,7 @@ void pgd_ctor(void *pgd, kmem_cache_t *c if (PTRS_PER_PMD == 1) { memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); + SetPagePDE(virt_to_page(pgd)); spin_lock_irqsave(&pgd_lock, flags); } @@ -227,6 +228,7 @@ void pgd_dtor(void *pgd, kmem_cache_t *c { unsigned long flags; /* can be called fro...

...to the list when splitting or rejoining large pages. Signed-off-by: Zachary Amsden <zach@vmware.com> diff -r 2247ff2c3fdb arch/i386/mm/pgtable.c --- a/arch/i386/mm/pgtable.c Thu Apr 05 17:29:15 2007 -0700 +++ b/arch/i386/mm/pgtable.c Thu Apr 05 17:40:02 2007 -0700 @@ -241,18 +241,16 @@ void pgd_ctor(void *pgd, struct kmem_cac /* !PAE, no pagetable sharing */ memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); + spin_lock_irqsave(&pgd_lock, flags); + + /* must happen under lock */ clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, KERNEL_PGD_P...

...to the list when splitting or rejoining large pages. Signed-off-by: Zachary Amsden <zach@vmware.com> diff -r 2247ff2c3fdb arch/i386/mm/pgtable.c --- a/arch/i386/mm/pgtable.c Thu Apr 05 17:29:15 2007 -0700 +++ b/arch/i386/mm/pgtable.c Thu Apr 05 17:40:02 2007 -0700 @@ -241,18 +241,16 @@ void pgd_ctor(void *pgd, struct kmem_cac /* !PAE, no pagetable sharing */ memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); + spin_lock_irqsave(&pgd_lock, flags); + + /* must happen under lock */ clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, KERNEL_PGD_P...

...ge); + paravirt_release_pt(page_to_pfn(kpte_page)); list_add(&kpte_page->lru, &df_list); revert_page(kpte_page, address); } =================================================================== --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -245,8 +245,14 @@ void pgd_ctor(void *pgd, kmem_cache_t *c clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, KERNEL_PGD_PTRS); + if (PTRS_PER_PMD > 1) return; + + /* must happen under lock */ + paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT, + __pa(swapper_pg_dir) &gt...

...ge); + paravirt_release_pt(page_to_pfn(kpte_page)); list_add(&kpte_page->lru, &df_list); revert_page(kpte_page, address); } =================================================================== --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -245,8 +245,14 @@ void pgd_ctor(void *pgd, kmem_cache_t *c clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, KERNEL_PGD_PTRS); + if (PTRS_PER_PMD > 1) return; + + /* must happen under lock */ + paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT, + __pa(swapper_pg_dir) &gt...

...ge); + paravirt_release_pt(page_to_pfn(kpte_page)); list_add(&kpte_page->lru, &df_list); revert_page(kpte_page, address); } =================================================================== --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -245,8 +245,14 @@ void pgd_ctor(void *pgd, kmem_cache_t *c clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, KERNEL_PGD_PTRS); + if (PTRS_PER_PMD > 1) return; + + /* must happen under lock */ + paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT, + __pa(swapper_pg_dir) &gt...

...ge); + paravirt_release_pt(page_to_pfn(kpte_page)); list_add(&kpte_page->lru, &df_list); revert_page(kpte_page, address); } =================================================================== --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -245,8 +245,14 @@ void pgd_ctor(void *pgd, kmem_cache_t *c clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, KERNEL_PGD_PTRS); + if (PTRS_PER_PMD > 1) return; + + /* must happen under lock */ + paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT, + __pa(swapper_pg_dir) &gt...

Is there any real use in having a ctor/dtor for the pgd cache? Given that all pgd allocation happens via pgd_alloc/pgd_free, why not just fold the [cd]tor in? I'm asking because Xen wants pgd[3] to be unshared in the PAE case, and it looks to me like the easiest way to handle that is by making pgd_alloc/free pv-ops and doing the appropriate thing in the Xen code. Would need to sort out the

Is there any real use in having a ctor/dtor for the pgd cache? Given that all pgd allocation happens via pgd_alloc/pgd_free, why not just fold the [cd]tor in? I'm asking because Xen wants pgd[3] to be unshared in the PAE case, and it looks to me like the easiest way to handle that is by making pgd_alloc/free pv-ops and doing the appropriate thing in the Xen code. Would need to sort out the

.../arch/i386/mm/pgtable.c --- pristine-linux-2.6.12/arch/i386/mm/pgtable.c 2005-06-17 21:48:29.000000000 +0200 -+++ linux-2.6.12-xen/arch/i386/mm/pgtable.c 2006-02-17 00:45:18.267516262 +0100 ++++ linux-2.6.12-xen/arch/i386/mm/pgtable.c 2006-02-25 00:12:33.824986259 +0100 @@ -199,19 +199,20 @@ void pgd_ctor(void *pgd, kmem_cache_t *c { unsigned long flags; @@ -2290,7 +2290,7 @@ * Make a PAL call using the stacked registers calling convention. diff -Nurp pristine-linux-2.6.12/arch/ia64/kernel/ptrace.c linux-2.6.12-xen/arch/ia64/kernel/ptrace.c --- pristine-linux-2.6.12/arch/ia64/kernel/ptrace...

This patch series implements the Linux Xen guest in terms of the paravirt-ops interface. The features in implemented this patch series are: * domU only * UP only (most code is SMP-safe, but there's no way to create a new vcpu) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes * xen console * virtual block

This patch series implements the Linux Xen guest in terms of the paravirt-ops interface. The features in implemented this patch series are: * domU only * UP only (most code is SMP-safe, but there's no way to create a new vcpu) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes * xen console * virtual block

This patch series implements the Linux Xen guest in terms of the paravirt-ops interface. The features in implemented this patch series are: * domU only * UP only (most code is SMP-safe, but there's no way to create a new vcpu) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes * xen console * virtual block

Hi Andi, This series of patches updates paravirt_ops in various ways. Some of the changes are plain cleanups and improvements, and some add some interfaces necessary for Xen. The brief overview: add-MAINTAINERS.patch - obvious remove-CONFIG_DEBUG_PARAVIRT.patch - no longer needed paravirt-nop.patch - mark nop operations consistently paravirt-pte-accessors.patch - operations to pack/unpack

Hi Andi, This series of patches updates paravirt_ops in various ways. Some of the changes are plain cleanups and improvements, and some add some interfaces necessary for Xen. The brief overview: add-MAINTAINERS.patch - obvious remove-CONFIG_DEBUG_PARAVIRT.patch - no longer needed paravirt-nop.patch - mark nop operations consistently paravirt-pte-accessors.patch - operations to pack/unpack

Hi Andi, This patch series implements the Linux Xen guest in terms of the paravirt-ops interface. The features in implemented this patch series are: * domU only * UP only (most code is SMP-safe, but there's no way to create a new vcpu) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes * xen console * virtual