[Xen-changelog] [xen stable-4.4] x86/tboot: invalidate FIX_TBOOT_MAP_ADDRESS mapping after use

[patchbot@xxxxxxx]

commit b9654f9dcbd4bc5bcc61251dc1a2a20fed7867a2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Mar 12 14:20:52 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Mar 12 14:20:52 2015 +0100

    x86/tboot: invalidate FIX_TBOOT_MAP_ADDRESS mapping after use
    
    In order for commit cbeeaa7d ("x86/nmi: fix shootdown of pcpus
    running in VMX non-root mode")'s re-use of that fixmap entry to not
    cause undesirable (in crash context) cross-CPU TLB flushes, invalidate
    the fixmap entry right after use.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 375a09cffacff820e025c65d0cdfbd403ecb30cc
    master date: 2015-03-04 09:59:47 +0100
---
 xen/arch/x86/tboot.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/tboot.c b/xen/arch/x86/tboot.c
index ccde4a0..9fb3f19 100644
--- a/xen/arch/x86/tboot.c
+++ b/xen/arch/x86/tboot.c
@@ -140,6 +140,7 @@ void __init tboot_probe(void)
                       TXT_PUB_CONFIG_REGS_BASE + TXTCR_SINIT_BASE);
     tboot_copy_memory((unsigned char *)&sinit_size, sizeof(sinit_size),
                       TXT_PUB_CONFIG_REGS_BASE + TXTCR_SINIT_SIZE);
+    __set_fixmap(FIX_TBOOT_MAP_ADDRESS, 0, 0);
 }
 
 /* definitions from xen/drivers/passthrough/vtd/iommu.h
@@ -477,6 +478,8 @@ int __init tboot_parse_dmar_table(acpi_table_handler 
dmar_handler)
     dmar_table_raw = xmalloc_array(unsigned char, dmar_table_length);
     tboot_copy_memory(dmar_table_raw, dmar_table_length, pa);
     dmar_table = (struct acpi_table_header *)dmar_table_raw;
+    __set_fixmap(FIX_TBOOT_MAP_ADDRESS, 0, 0);
+
     rc = dmar_handler(dmar_table);
     xfree(dmar_table_raw);
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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