search for: hypervisor_update_descriptor

...ting with my (still in progress!) Linux LDT test suite. First interface quirk came up. It looks like Xen wants to return errors from hypercalls: +static inline int install_ldt_entry (__u32 *lp, __u32 entry_1, __u32 entry_2) +{ + unsigned long mach_lp = arbitrary_virt_to_machine(lp); + + return HYPERVISOR_update_descriptor(mach_lp, entry_1, entry_2); +} While this is fine here, this could be problematic in terms of forcing error checking in lots of situations where there used to be no error checking in regular Linux - i.e. GDT updates which fail really are fatal to the guest, and we don't want to pepper the b...

...ting with my (still in progress!) Linux LDT test suite. First interface quirk came up. It looks like Xen wants to return errors from hypercalls: +static inline int install_ldt_entry (__u32 *lp, __u32 entry_1, __u32 entry_2) +{ + unsigned long mach_lp = arbitrary_virt_to_machine(lp); + + return HYPERVISOR_update_descriptor(mach_lp, entry_1, entry_2); +} While this is fine here, this could be problematic in terms of forcing error checking in lots of situations where there used to be no error checking in regular Linux - i.e. GDT updates which fail really are fatal to the guest, and we don't want to pepper the b...

...>context.pinned) { + spin_lock(&mm_unpinned_lock); + list_del(&mm->context.unpinned); + spin_unlock(&mm_unpinned_lock); + } +} + +static inline int install_ldt_entry (__u32 *lp, __u32 entry_1, __u32 entry_2) +{ + unsigned long mach_lp = arbitrary_virt_to_machine(lp); + + return HYPERVISOR_update_descriptor(mach_lp, entry_1, entry_2); +} + +#endif /* __ASM_HYPERVISOR_HOOKS_H */

...>context.pinned) { + spin_lock(&mm_unpinned_lock); + list_del(&mm->context.unpinned); + spin_unlock(&mm_unpinned_lock); + } +} + +static inline int install_ldt_entry (__u32 *lp, __u32 entry_1, __u32 entry_2) +{ + unsigned long mach_lp = arbitrary_virt_to_machine(lp); + + return HYPERVISOR_update_descriptor(mach_lp, entry_1, entry_2); +} + +#endif /* __ASM_HYPERVISOR_HOOKS_H */

...mach_desc.h 2005-08-08 21:19:43.000000000 -0700 @@ -0,0 +1,11 @@ +#ifndef __MACH_DESC_H +#define __MACH_DESC_H + +static inline void write_ldt_entry (struct desc_struct *ldt, int entry, __u32 entry_1, __u32 entry_2) +{ + unsigned long mach_lp = arbitrary_virt_to_machine(&ldt[entry]); + + return HYPERVISOR_update_descriptor(mach_lp, entry_1, entry_2); +} + +#endif

...mach_desc.h 2005-08-08 21:19:43.000000000 -0700 @@ -0,0 +1,11 @@ +#ifndef __MACH_DESC_H +#define __MACH_DESC_H + +static inline void write_ldt_entry (struct desc_struct *ldt, int entry, __u32 entry_1, __u32 entry_2) +{ + unsigned long mach_lp = arbitrary_virt_to_machine(&ldt[entry]); + + return HYPERVISOR_update_descriptor(mach_lp, entry_1, entry_2); +} + +#endif

Hi, Anyone has this working? Looks like there is a chicken-and-egg issue with pda setup: * xen_load_gdt() uses multicalls, thus depends on cpu-specific variables (per-cpu mc buffer) which in turn requires pda being setup already. * pda setup can't be done before xen_load_gdt() ... Next question while looking at xen_load_gdt(): why does it use multicalls in the first place?

Hi, Anyone has this working? Looks like there is a chicken-and-egg issue with pda setup: * xen_load_gdt() uses multicalls, thus depends on cpu-specific variables (per-cpu mc buffer) which in turn requires pda being setup already. * pda setup can't be done before xen_load_gdt() ... Next question while looking at xen_load_gdt(): why does it use multicalls in the first place?

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 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

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) *