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x86: Allow forward compatibility mode for FPU

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At the moment we refuse to restore if CPU mismatch
at FPU related features. Strictly speaking this is
not required.

We can allow to restore on the node with xsave capability
even if the node was created on cpu which has fxsave
capability only.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov
2014-01-31 13:05:43 +04:00
committed by Pavel Emelyanov
parent eee9ad2b44
commit ad0f698055
1 changed files with 9 additions and 7 deletions
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16
arch/x86/crtools.c
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@@ -317,12 +317,8 @@ static bool valid_xsave_frame(CoreEntry *core)
}
if (cpu_has_feature(X86_FEATURE_XSAVE)) {
if (!core->thread_info->fpregs->xsave) {
pr_err("FPU xsave area is missing, "
"but host cpu requires it\n");
return false;
}
if (core->thread_info->fpregs->xsave->n_ymmh_space < ARRAY_SIZE(x->ymmh.ymmh_space)) {
if (core->thread_info->fpregs->xsave &&
core->thread_info->fpregs->xsave->n_ymmh_space < ARRAY_SIZE(x->ymmh.ymmh_space)) {
pr_err("Corruption in FPU ymmh_space area "
"(got %li but %li expected)\n",
(long)core->thread_info->fpregs->xsave->n_ymmh_space,
@@ -402,7 +398,13 @@ int restore_fpu(struct rt_sigframe *sigframe, CoreEntry *core)
void *magic2;
x->xsave_hdr.xstate_bv = XSTATE_FP | XSTATE_SSE | XSTATE_YMM;
assign_array(x->ymmh, core->thread_info->fpregs->xsave, ymmh_space);
/*
* fpregs->xsave pointer might not present on image so we
* simply clear out all ymm registers.
*/
if (core->thread_info->fpregs->xsave)
assign_array(x->ymmh, core->thread_info->fpregs->xsave, ymmh_space);
fpx_sw->magic1 = FP_XSTATE_MAGIC1;
fpx_sw->xstate_bv = XSTATE_FP | XSTATE_SSE | XSTATE_YMM;