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| author | David Woodhouse <David.Woodhouse@intel.com> | 2008-07-11 14:36:25 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2008-07-11 14:36:25 +0100 |
| commit | a8931ef380c92d121ae74ecfb03b2d63f72eea6f (patch) | |
| tree | 980fb6b019e11e6cb1ece55b7faff184721a8053 /drivers/lguest/x86/core.c | |
| parent | 90574d0a4d4b73308ae54a2a57a4f3f1fa98e984 (diff) | |
| parent | e5a5816f7875207cb0a0a7032e39a4686c5e10a4 (diff) | |
| download | olio-linux-3.10-a8931ef380c92d121ae74ecfb03b2d63f72eea6f.tar.xz olio-linux-3.10-a8931ef380c92d121ae74ecfb03b2d63f72eea6f.zip | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'drivers/lguest/x86/core.c')
| -rw-r--r-- | drivers/lguest/x86/core.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 5126d5d9ea0..2e554a4ab33 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -176,7 +176,7 @@ void lguest_arch_run_guest(struct lg_cpu *cpu) * we set it now, so we can trap and pass that trap to the Guest if it * uses the FPU. */ if (cpu->ts) - lguest_set_ts(); + unlazy_fpu(current); /* 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 @@ -196,6 +196,10 @@ void lguest_arch_run_guest(struct lg_cpu *cpu) * trap made the switcher code come back, and an error code which some * traps set. */ + /* Restore SYSENTER if it's supposed to be on. */ + if (boot_cpu_has(X86_FEATURE_SEP)) + wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0); + /* 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 * re-enable interrupts an interrupt could fault and thus overwrite @@ -203,13 +207,12 @@ void lguest_arch_run_guest(struct lg_cpu *cpu) if (cpu->regs->trapnum == 14) cpu->arch.last_pagefault = read_cr2(); /* Similarly, if we took a trap because the Guest used the FPU, - * we have to restore the FPU it expects to see. */ + * we have to restore the FPU it expects to see. + * math_state_restore() may sleep and we may even move off to + * a different CPU. So all the critical stuff should be done + * before this. */ else if (cpu->regs->trapnum == 7) math_state_restore(); - - /* Restore SYSENTER if it's supposed to be on. */ - if (boot_cpu_has(X86_FEATURE_SEP)) - wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0); } /*H:130 Now we've examined the hypercall code; our Guest can make requests. |