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author | Ingo Molnar <mingo@elte.hu> | 2008-06-25 12:30:33 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-06-25 12:30:33 +0200 |
commit | 48cf937f48f68bd1e61f37c6357dbff5adb95532 (patch) | |
tree | d9e2368a419adc2c11691be2842c66213bec5a42 /drivers/lguest/x86/core.c | |
parent | fce39665abb71d01d74ac74eb13dd69a799dfc2f (diff) | |
parent | 543cf4cb3fe6f6cae3651ba918b9c56200b257d0 (diff) | |
download | op-kernel-dev-48cf937f48f68bd1e61f37c6357dbff5adb95532.zip op-kernel-dev-48cf937f48f68bd1e61f37c6357dbff5adb95532.tar.gz |
Merge branch 'linus' into x86/i8259
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 5126d5d..2e554a4 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. |