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 <jbeul...@suse.com>
--- a/xen/arch/x86/tboot.c
+++ b/xen/arch/x86/tboot.c
@@ -138,6 +138,7 @@ 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
@@ -476,6 +477,8 @@ int __init tboot_parse_dmar_table(acpi_t
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);
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 <jbeul...@suse.com>
--- a/xen/arch/x86/tboot.c
+++ b/xen/arch/x86/tboot.c
@@ -138,6 +138,7 @@ 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
@@ -476,6 +477,8 @@ int __init tboot_parse_dmar_table(acpi_t
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);
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