The following commit has been merged into the x86/cleanups branch of tip:
Commit-ID: 8539d3f06710a9e91b9968fa736549d7c6b44206
Gitweb: https://git.kernel.org/tip/8539d3f06710a9e91b9968fa736549d7c6b44206
Author: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
AuthorDate: Tue, 27 Oct 2020 14:45:32 -07:00
Committer: Borislav Petkov <bp@xxxxxxx>
CommitterDate: Thu, 26 Nov 2020 12:58:56 +01:00
x86/asm: Drop unused RDPID macro
Drop the GAS-compatible RDPID macro. RDPID is unsafe in the kernel
because KVM loads guest's TSC_AUX on VM-entry and may not restore the
host's value until the CPU returns to userspace.
See
6a3ea3e68b8a ("x86/entry/64: Do not use RDPID in paranoid entry to accomodate KVM")
for details.
It can always be resurrected from git history, if needed.
[ bp: Massage commit message. ]
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/20201027214532.1792-1-sean.j.christopherson@xxxxxxxxx
---
arch/x86/include/asm/inst.h | 15 ---------------
1 file changed, 15 deletions(-)
diff --git a/arch/x86/include/asm/inst.h b/arch/x86/include/asm/inst.h
index bd7f024..438ccd4 100644
--- a/arch/x86/include/asm/inst.h
+++ b/arch/x86/include/asm/inst.h
@@ -143,21 +143,6 @@
.macro MODRM mod opd1 opd2
.byte \mod | (\opd1 & 7) | ((\opd2 & 7) << 3)
.endm
-
-.macro RDPID opd
- REG_TYPE rdpid_opd_type \opd
- .if rdpid_opd_type == REG_TYPE_R64
- R64_NUM rdpid_opd \opd
- .else
- R32_NUM rdpid_opd \opd
- .endif
- .byte 0xf3
- .if rdpid_opd > 7
- PFX_REX rdpid_opd 0
- .endif
- .byte 0x0f, 0xc7
- MODRM 0xc0 rdpid_opd 0x7
-.endm
#endif
#endif
|