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a5d5f328b0
linux/arch/x86/xen
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Juergen Gross a5d5f328b0 xen: allocate page for shared info page from low memory 
In a HVM guest the kernel allocates the page for mapping the shared
info structure via extend_brk() today. This will lead to a drop of
performance as the underlying EPT entry will have to be split up into
4kB entries as the single shared info page is located in hypervisor
memory.

The issue has been detected by using the libmicro munmap test:
unmapping 8kB of memory was faster by nearly a factor of two when no
pv interfaces were active in the HVM guest.

So instead of taking a page from memory which might be mapped via
large EPT entries use a page which is already mapped via a 4kB EPT
entry: we can take a page from the first 1MB of memory as the video
memory at 640kB disallows using larger EPT entries.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
2017-06-25 13:11:27 +02:00
..
apic.c x86/xen: Fix APIC id mismatch warning on Intel 2017-01-29 18:59:16 -05:00
debugfs.c x86/xen: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:59 +02:00
debugfs.h debugfs: Add support to print u32 array in debugfs 2012-04-17 00:18:36 -04:00
efi.c xen: Implement EFI reset_system callback 2017-05-02 12:06:50 +02:00
enlighten_hvm.c xen: allocate page for shared info page from low memory 2017-06-25 13:11:27 +02:00
enlighten_pv.c xen: allocate page for shared info page from low memory 2017-06-25 13:11:27 +02:00
enlighten_pvh.c xen/pvh: Do not fill kernel's e820 map in init_pvh_bootparams() 2017-05-02 11:17:39 +02:00
enlighten.c xen/vcpu: Handle xen_vcpu_setup() failure in hotplug 2017-06-13 16:10:55 +02:00
grant-table.c xen/grant-table: Use kmalloc_array() in arch_gnttab_valloc() 2016-08-26 10:44:22 +01:00
irq.c x86/xen: use xen_vcpu_id mapping for HYPERVISOR_vcpu_op 2016-07-25 13:32:34 +01:00
Kconfig x86/xen: enable PVHVM-only builds 2017-05-02 11:10:16 +02:00
Makefile x86/xen: enable PVHVM-only builds 2017-05-02 11:10:16 +02:00
mmu_hvm.c x86/xen: split off mmu_hvm.c 2017-05-02 11:05:10 +02:00
mmu_pv.c xen: cleanup pvh leftovers from pv-only sources 2017-05-19 08:04:20 +02:00
mmu.c xen: make xen_flush_tlb_all() static 2017-05-19 08:04:25 +02:00
mmu.h x86/xen: Change __xen_pgd_walk() and xen_cleanmfnmap() to support p4d 2017-03-27 08:56:49 +02:00
multicalls.c x86: Replace __get_cpu_var uses 2014-08-26 13:45:49 -04:00
multicalls.h xen: use this_cpu_xxx replace percpu_xxx funcs 2012-01-24 12:20:24 -05:00
p2m.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
pci-swiotlb-xen.c treewide: Constify most dma_map_ops structures 2017-01-24 12:23:35 -05:00
platform-pci-unplug.c xen/pvh: PVH guests always have PV devices 2017-02-07 08:07:01 -05:00
pmu.c xen: Make VPMU init message look less scary 2016-08-24 18:45:38 +01:00
pmu.h x86/xen: put setup.c, pmu.c and apic.c under CONFIG_XEN_PV 2017-05-02 11:09:28 +02:00
setup.c xen/x86: Remove PVH support 2017-02-07 08:07:01 -05:00
smp_hvm.c xen/vcpu: Handle xen_vcpu_setup() failure at boot 2017-06-13 16:10:58 +02:00
smp_pv.c xen/vcpu: Handle xen_vcpu_setup() failure at boot 2017-06-13 16:10:58 +02:00
smp.c xen/vcpu: Handle xen_vcpu_setup() failure at boot 2017-06-13 16:10:58 +02:00
smp.h xen/vcpu: Handle xen_vcpu_setup() failure at boot 2017-06-13 16:10:58 +02:00
spinlock.c locking/spinlocks/x86, paravirt: Remove paravirt_ticketlocks_enabled 2017-01-14 09:33:46 +01:00
suspend_hvm.c xen/pvh*: Support > 32 VCPUs at domain restore 2017-06-13 16:05:17 +02:00
suspend_pv.c x86/xen: split suspend.c for PV and PVHVM guests 2017-05-02 11:09:17 +02:00
suspend.c x86/xen: split suspend.c for PV and PVHVM guests 2017-05-02 11:09:17 +02:00
time.c xen/x86: Do not call xen_init_time_ops() until shared_info is initialized 2017-05-05 10:43:15 +02:00
trace.c xen: use generated hypervisor symbols in arch/x86/xen/trace.c 2015-03-16 14:49:13 +00:00
vdso.h
vga.c xen/vga: add the xen EFI video mode support 2012-09-24 09:28:57 -04:00
xen-asm_32.S x86/paravirt: Remove the unused irq_enable_sysexit pv op 2015-11-23 10:48:16 +01:00
xen-asm_64.S x86/asm/xen: Set ELF function type for xen_adjust_exception_frame() 2016-02-24 08:35:41 +01:00
xen-asm.h
xen-asm.S x86/asm/xen: Create stack frames in xen-asm.S 2016-02-24 08:35:42 +01:00
xen-head.S x86/xen: define startup_xen for XEN PV only 2017-05-02 11:09:37 +02:00
xen-ops.h xen/vcpu: Handle xen_vcpu_setup() failure in hotplug 2017-06-13 16:10:55 +02:00
xen-pvh.S xen/pvh: Bootstrap PVH guest 2017-02-07 08:07:01 -05:00