diff options
| author | Andy Lutomirski <luto@kernel.org> | 2016-10-31 15:18:46 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-11-01 07:47:54 +0100 |
| commit | cd95ea81f25608c403052d0508ee5c9b32e2bc7d (patch) | |
| tree | b5901aa76a2882cf4e722faa33b430945455d1dc /drivers | |
| parent | 04ac88abaf758bd76edcc3be5549003a017e7963 (diff) | |
x86/fpu, lguest: Remove CR0.TS support
Now that Linux never sets CR0.TS, lguest doesn't need to support it.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm list <kvm@vger.kernel.org>
Link: http://lkml.kernel.org/r/8a7bf2c11231c082258fd67705d0f275639b8475.1477951965.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/lguest/hypercalls.c | 4 | ||||
| -rw-r--r-- | drivers/lguest/lg.h | 1 | ||||
| -rw-r--r-- | drivers/lguest/x86/core.c | 19 |
3 files changed, 1 insertions, 23 deletions
diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 19a32280731d..601f81c04873 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -109,10 +109,6 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) case LHCALL_SET_CLOCKEVENT: guest_set_clockevent(cpu, args->arg1); break; - case LHCALL_TS: - /* This sets the TS flag, as we saw used in run_guest(). */ - cpu->ts = args->arg1; - break; case LHCALL_HALT: /* Similarly, this sets the halted flag for run_guest(). */ cpu->halted = 1; diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 69b3814afd2f..2356a2318034 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -43,7 +43,6 @@ struct lg_cpu { struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ u32 cr2; - int ts; u32 esp1; u16 ss1; diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 6e9042e3d2a9..743253fc638f 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -247,14 +247,6 @@ unsigned long *lguest_arch_regptr(struct lg_cpu *cpu, size_t reg_off, bool any) void lguest_arch_run_guest(struct lg_cpu *cpu) { /* - * Remember the awfully-named TS bit? If the Guest has asked to set it - * we set it now, so we can trap and pass that trap to the Guest if it - * uses the FPU. - */ - if (cpu->ts && fpregs_active()) - stts(); - - /* * SYSENTER is an optimized way of doing system calls. We can't allow * it because it always jumps to privilege level 0. A normal Guest * won't try it because we don't advertise it in CPUID, but a malicious @@ -282,10 +274,6 @@ void lguest_arch_run_guest(struct lg_cpu *cpu) if (boot_cpu_has(X86_FEATURE_SEP)) wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0); - /* Clear the host TS bit if it was set above. */ - if (cpu->ts && fpregs_active()) - clts(); - /* * If the Guest page faulted, then the cr2 register will tell us the * bad virtual address. We have to grab this now, because once we @@ -421,12 +409,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) kill_guest(cpu, "Writing cr2"); break; case 7: /* We've intercepted a Device Not Available fault. */ - /* - * If the Guest doesn't want to know, we already restored the - * Floating Point Unit, so we just continue without telling it. - */ - if (!cpu->ts) - return; + /* No special handling is needed here. */ break; case 32 ... 255: /* This might be a syscall. */ |