search for: gnttab_end_foreign_access

.../mm.h> #include <linux/seqlock.h> +#include <linux/timer.h> #include <xen/interface/xen.h> #include <xen/gnttab.h> #include <asm/pgtable.h> @@ -183,35 +184,119 @@ int gnttab_query_foreign_access(grant_re } EXPORT_SYMBOL_GPL(gnttab_query_foreign_access); -int gnttab_end_foreign_access_ref(grant_ref_t ref) +static inline int _gnttab_end_foreign_access_ref(grant_ref_t ref) { u16 flags, nflags; nflags = shared[ref].flags; do { - if ((flags = nflags) & (GTF_reading|GTF_writing)) { - printk(KERN_DEBUG "WARNING: g.e. still in use!\n"); + if ((flags = nflags)...

...;jbeulich@suse.com> --- drivers/xen/grant-table.c | 106 +++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 96 insertions(+), 10 deletions(-) --- 3.4-rc1/drivers/xen/grant-table.c +++ 3.4-rc1-xen-gnttab-deferred-end-access/drivers/xen/grant-table.c @@ -426,10 +426,8 @@ static int gnttab_end_foreign_access_ref nflags = *pflags; do { flags = nflags; - if (flags & (GTF_reading|GTF_writing)) { - printk(KERN_ALERT "WARNING: g.e. still in use!\n"); + if (flags & (GTF_reading|GTF_writing)) return 0; - } } while ((nflags = sync_cmpxchg(pflags, flags, 0)) != flags); re...

...grant maps for xen blk drivers" from Oct 24, 2012, leads to the following warning: drivers/block/xen-blkfront.c:807 blkif_free() warn: 'persistent_gnt' was already freed. 807 llist_for_each_entry(persistent_gnt, all_gnts, node) { 808 gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); 809 __free_page(pfn_to_page(persistent_gnt->pfn)); 810 kfree(persistent_gnt); ^^^^^^^^^^^^^^ We dereference this to find the next element in the list. It will work if...

...grant maps for xen blk drivers" from Oct 24, 2012, leads to the following warning: drivers/block/xen-blkfront.c:807 blkif_free() warn: 'persistent_gnt' was already freed. 807 llist_for_each_entry(persistent_gnt, all_gnts, node) { 808 gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); 809 __free_page(pfn_to_page(persistent_gnt->pfn)); 810 kfree(persistent_gnt); ^^^^^^^^^^^^^^ We dereference this to find the next element in the list. It will work if...

...info->connected = suspend ? @@ -698,16 +704,19 @@ static void blkif_free(struct blkfront_info *info, int suspend) flush_work_sync(&info->work); /* Free resources associated with old device channel. */ - if (info->ring_ref != GRANT_INVALID_REF) { - gnttab_end_foreign_access(info->ring_ref, 0, - (unsigned long)info->ring.sring); - info->ring_ref = GRANT_INVALID_REF; - info->ring.sring = NULL; + for (i = 0; i < (1 << info->ring_order); i++) { + if (info->ri...

...info->connected = suspend ? @@ -698,16 +704,19 @@ static void blkif_free(struct blkfront_info *info, int suspend) flush_work_sync(&info->work); /* Free resources associated with old device channel. */ - if (info->ring_ref != GRANT_INVALID_REF) { - gnttab_end_foreign_access(info->ring_ref, 0, - (unsigned long)info->ring.sring); - info->ring_ref = GRANT_INVALID_REF; - info->ring.sring = NULL; + for (i = 0; i < (1 << info->ring_order); i++) { + if (info->ri...

...info->connected = suspend ? @@ -698,16 +704,19 @@ static void blkif_free(struct blkfront_info *info, int suspend) flush_work_sync(&info->work); /* Free resources associated with old device channel. */ - if (info->ring_ref != GRANT_INVALID_REF) { - gnttab_end_foreign_access(info->ring_ref, 0, - (unsigned long)info->ring.sring); - info->ring_ref = GRANT_INVALID_REF; - info->ring.sring = NULL; + for (i = 0; i < (1 << info->ring_order); i++) { + if (info->ri...

...nfo *info, int suspend) /* No more blkif_request(). */ if (info->rq) blk_stop_queue(info->rq); + + /* Remove all persistent grants */ + while (info->persistent_grants_front) { + pers_gnt = info->persistent_grants_front; + info->persistent_grants_front = pers_gnt->tail; + gnttab_end_foreign_access(pers_gnt->gref, 0, 0UL); + kfree(pers_gnt); + } + /* No more gnttab callback work. */ gnttab_cancel_free_callback(&info->callback); spin_unlock_irq(&info->io_lock); @@ -734,13 +818,44 @@ static void blkif_free(struct blkfront_info *info, int suspend) } -static void blki...

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. 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 hvc console (console=hvc0) *

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. 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 hvc console (console=hvc0) *

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. 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 hvc console (console=hvc0) *

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

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

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

Unlike full virtualization in which the virtual machine provides the same platform interface as running natively on the hardware, paravirtualization requires modification to the guest operating system to work with the platform interface provided by the hypervisor. Xen was designed with performance in mind. Calls to the hypervisor are minimized, batched if necessary, and non-critical codepaths

Unlike full virtualization in which the virtual machine provides the same platform interface as running natively on the hardware, paravirtualization requires modification to the guest operating system to work with the platform interface provided by the hypervisor. Xen was designed with performance in mind. Calls to the hypervisor are minimized, batched if necessary, and non-critical codepaths

Hi Andi, This series of patches implements the Xen paravirt-ops interface. It applies to 2.6.21-rc7 + your patches + the last batch of pv_ops patches I posted. This patch generally restricts itself to Xen-specific parts of the tree, though it does make a few small changes elsewhere. These patches include: - some helper routines for allocating address space and walking pagetables - Xen

Hi Andi, This series of patches implements the Xen paravirt-ops interface. It applies to 2.6.21-rc7 + your patches + the last batch of pv_ops patches I posted. This patch generally restricts itself to Xen-specific parts of the tree, though it does make a few small changes elsewhere. These patches include: - some helper routines for allocating address space and walking pagetables - Xen

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. 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 hvc console (console=hvc0) *

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. 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 hvc console (console=hvc0) *