search for: gnttab_query_foreign_access

...sionally get a panic at the dev_kfree_skb_irq(skb); line. This is the same panic as reported in http://lists.xensource.com/archives/html/xen-devel/2006-05/msg00919.html The trace indicates that the skb is bad and it looks like the skb is an id. Investigating further, the condition occurs if the gnttab_query_foreign_access returns non zero on a second or latter iteration through the for loop. If it return non zero, the the code takes the ''goto out'' which by passes fixing up np->tx.rsp_cons. Then the next time in network_tx_buf_gc we reuse np->tx.rsp_cons which is at the location of a previ...

...| _raw_spin_unlock(); 1) | handle_irq_event_percpu() { 1) | xennet_interrupt() { 1) 0.125 us | _raw_spin_lock_irqsave(); 1) | xennet_tx_buf_gc() { 1) 0.079 us | gnttab_query_foreign_access(); 1) 0.050 us | gnttab_end_foreign_access_ref(); 1) 0.069 us | gnttab_release_grant_reference(); 1) | dev_kfree_skb_irq() { 1) 0.055 us | raise_softirq_irqoff(); 1) 0.472 us |...

.../drivers/xen/core/gnttab.c @@ -35,6 +35,7 @@ #include <linux/sched.h> #include <linux/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...

...SOFTWARE. */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include <linux/module.h> #include <linux/kernel.h> #include <linux/netdevice.h> @@ -385,9 +387,8 @@ static void xennet_tx_buf_gc(struct net_device *dev) skb = np->tx_skbs[id].skb; if (unlikely(gnttab_query_foreign_access( np->grant_tx_ref[id]) != 0)) { - printk(KERN_ALERT "xennet_tx_buf_gc: warning " - "-- grant still in use by backend " - "domain.\n"); + pr_alert("%s: warning -- grant still in use by backend domain\n", + __func__);...

...SOFTWARE. */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include <linux/module.h> #include <linux/kernel.h> #include <linux/netdevice.h> @@ -385,9 +387,8 @@ static void xennet_tx_buf_gc(struct net_device *dev) skb = np->tx_skbs[id].skb; if (unlikely(gnttab_query_foreign_access( np->grant_tx_ref[id]) != 0)) { - printk(KERN_ALERT "xennet_tx_buf_gc: warning " - "-- grant still in use by backend " - "domain.\n"); + pr_alert("%s: warning -- grant still in use by backend domain\n", + __func__);...

...SOFTWARE. */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include <linux/module.h> #include <linux/kernel.h> #include <linux/netdevice.h> @@ -385,9 +387,8 @@ static void xennet_tx_buf_gc(struct net_device *dev) skb = np->tx_skbs[id].skb; if (unlikely(gnttab_query_foreign_access( np->grant_tx_ref[id]) != 0)) { - printk(KERN_ALERT "xennet_tx_buf_gc: warning " - "-- grant still in use by backend " - "domain.\n"); + pr_alert("%s: warning -- grant still in use by backend domain\n", + __func__);...

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) *

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 series of patches implements the Xen paravirt-ops interface. It applies to 2.6.21-git13 + patches-2.6.21-git7-070507-1.tar.gz (I think "unwinder" is the only patch which doesn't apply to git13, and the sched-clock patches are the only ones which this series actually needs). Changes since the last posting: - More netfront review and cleanup - Added ability to