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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-10-28 00:45:32 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-11-26 14:58:56 +0300 |
| commit | 8539d3f06710a9e91b9968fa736549d7c6b44206 (patch) | |
| tree | 85ca153b73501c4d0ab36f0a616232b5952c35af | |
| parent | ab09b58e4bdfdbcec425e54ebeaf6e209a96318f (diff) | |
| download | linux-8539d3f06710a9e91b9968fa736549d7c6b44206.tar.xz | |
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
| -rw-r--r-- | arch/x86/include/asm/inst.h | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/x86/include/asm/inst.h b/arch/x86/include/asm/inst.h index bd7f02480ca1..438ccd4f3cc4 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 |