73291eb01a
automatically update UEFI boot binary xen.spec - Upstream patches from Jan 51d5334e-x86-mm-Ensure-useful-progress-in-alloc_l2_table.patch 51dd155c-adjust-x86-EFI-build.patch 51e63d80-x86-cpuidle-Change-logging-for-unknown-APIC-IDs.patch 51e6540d-x86-don-t-use-destroy_xen_mappings-for-vunmap.patch 51e7963f-x86-time-Update-wallclock-in-shared-info-when-altering-domain-time-offset.patch 51ffd577-fix-off-by-one-mistakes-in-vm_alloc.patch 51ffd5fd-x86-refine-FPU-selector-handling-code-for-XSAVEOPT.patch 520114bb-Nested-VMX-Flush-TLBs-and-Caches-if-paging-mode-changed.patch 520a5504-VMX-add-boot-parameter-to-enable-disable-APIC-v-dynamically.patch 520a24f6-x86-AMD-Fix-nested-svm-crash-due-to-assertion-in-__virt_to_maddr.patch 520a2570-x86-AMD-Inject-GP-instead-of-UD-when-unable-to-map-vmcb.patch 520b4b60-VT-d-protect-against-bogus-information-coming-from-BIOS.patch 520b4bda-x86-MTRR-fix-range-check-in-mtrr_add_page.patch 520cb8b6-x86-time-fix-check-for-negative-time-in-__update_vcpu_system_time.patch 520d417d-xen-Add-stdbool.h-workaround-for-BSD.patch OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=266
42 lines
1.3 KiB
Diff
42 lines
1.3 KiB
Diff
# Commit 68caac7f6f4687241a24e804a9fca19aa26fe183
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# Date 2013-07-17 10:21:33 +0200
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# Author Jan Beulich <jbeulich@suse.com>
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# Committer Jan Beulich <jbeulich@suse.com>
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x86: don't use destroy_xen_mappings() for vunmap()
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Its attempt to tear down intermediate page table levels may race with
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map_pages_to_xen() establishing them, and now that
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map_domain_page_global() is backed by vmap() this teardown is also
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wasteful (as it's very likely to need the same address space populated
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again within foreseeable time).
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Signed-off-by: Jan Beulich <jbeulich@suse.com>
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Acked-by: Keir Fraser <keir@xen.org>
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--- a/xen/common/vmap.c
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+++ b/xen/common/vmap.c
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@@ -196,9 +196,13 @@ void *vmap(const unsigned long *mfn, uns
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void vunmap(const void *va)
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{
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+#ifndef _PAGE_NONE
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unsigned long addr = (unsigned long)va;
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destroy_xen_mappings(addr, addr + PAGE_SIZE * vm_size(va));
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+#else /* Avoid tearing down intermediate page tables. */
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+ map_pages_to_xen((unsigned long)va, 0, vm_size(va), _PAGE_NONE);
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+#endif
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vm_free(va);
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}
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#endif
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--- a/xen/include/asm-x86/page.h
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+++ b/xen/include/asm-x86/page.h
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@@ -288,6 +288,7 @@ extern l1_pgentry_t l1_identmap[L1_PAGET
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void paging_init(void);
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#endif /* !defined(__ASSEMBLY__) */
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+#define _PAGE_NONE _AC(0x000,U)
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#define _PAGE_PRESENT _AC(0x001,U)
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#define _PAGE_RW _AC(0x002,U)
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#define _PAGE_USER _AC(0x004,U)
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