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| author | Jan Beulich <jbeulich@suse.com> | 2013-10-11 09:30:31 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2013-10-11 09:30:31 +0200 |
| commit | 4b46e7be783df641b2889e514e85643febd378c2 (patch) | |
| tree | 27b7a86cad841a488a8b6f1aaea3fc695efcd859 /xen/arch/x86/Rules.mk | |
| parent | d06a0d715ec1423b6c42141ab1b0ff69a3effb56 (diff) | |
| download | xen-4b46e7be783df641b2889e514e85643febd378c2.tar.gz xen-4b46e7be783df641b2889e514e85643febd378c2.tar.bz2 xen-4b46e7be783df641b2889e514e85643febd378c2.zip | |
x86: use {rd,wr}{fs,gs}base when available
... as being intended to be faster than MSR reads/writes.
In the case of emulate_privileged_op() also use these in favor of the
cached (but possibly stale) addresses from arch.pv_vcpu. This allows
entirely removing the code that was the subject of XSA-67.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/arch/x86/Rules.mk')
| -rw-r--r-- | xen/arch/x86/Rules.mk | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/xen/arch/x86/Rules.mk b/xen/arch/x86/Rules.mk index c93d2affd3..576985e710 100644 --- a/xen/arch/x86/Rules.mk +++ b/xen/arch/x86/Rules.mk @@ -31,6 +31,7 @@ $(call cc-options-add,CFLAGS,CC,$(EMBEDDED_EXTRA_CFLAGS)) $(call cc-option-add,CFLAGS,CC,-Wnested-externs) $(call as-insn-check,CFLAGS,CC,"vmcall",-DHAVE_GAS_VMX) $(call as-insn-check,CFLAGS,CC,"invept (%rax)$$(comma)%rax",-DHAVE_GAS_EPT) +$(call as-insn-check,CFLAGS,CC,"rdfsbase %rax",-DHAVE_GAS_FSGSBASE) ifeq ($(supervisor_mode_kernel),y) CFLAGS += -DCONFIG_X86_SUPERVISOR_MODE_KERNEL=1 |