Messages in this thread Patch in this message | | | Date | Thu, 26 Nov 2020 12:14:42 -0000 | From | "tip-bot2 for Sean Christopherson" <> | Subject | [tip: x86/cleanups] x86/asm: Drop unused RDPID macro |
| |
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@intel.com> AuthorDate: Tue, 27 Oct 2020 14:45:32 -07:00 Committer: Borislav Petkov <bp@suse.de> 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@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20201027214532.1792-1-sean.j.christopherson@intel.com --- 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
| |