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SUSE:SLE-12:Update
xen
5b21825d-1-x86-support-fully-eager-FPU-context-...
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File 5b21825d-1-x86-support-fully-eager-FPU-context-switching.patch of Package xen
# Commit 146dfe9277c2b4a8c399b229e00d819065e3167b # Date 2018-06-13 21:45:17 +0100 # Author Andrew Cooper <andrew.cooper3@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> x86: Support fully eager FPU context switching This is controlled on a per-vcpu bases for flexibility. This is part of XSA-267 / CVE-2018-3665 Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/i387.c +++ b/xen/arch/x86/i387.c @@ -215,8 +215,25 @@ void vcpu_restore_fpu_eager(struct vcpu { ASSERT(!is_idle_vcpu(v)); + if ( v->arch.fully_eager_fpu ) + { + /* Avoid recursion */ + clts(); + + if ( cpu_has_xsave ) + fpu_xrstor(v, XSTATE_ALL); + else + fpu_fxrstor(v); + + v->fpu_initialised = 1; + v->fpu_dirtied = 1; + + /* Xen doesn't need TS set, but the guest might. */ + if ( is_pv_vcpu(v) && (v->arch.pv_vcpu.ctrlreg[0] & X86_CR0_TS) ) + stts(); + } /* save the nonlazy extended state which is not tracked by CR0.TS bit */ - if ( v->arch.nonlazy_xstate_used ) + else if ( v->arch.nonlazy_xstate_used ) { /* Avoid recursion */ clts(); @@ -238,6 +255,8 @@ void vcpu_restore_fpu_lazy(struct vcpu * if ( v->fpu_dirtied ) return; + ASSERT(!v->arch.fully_eager_fpu); + if ( cpu_has_xsave ) fpu_xrstor(v, XSTATE_LAZY); else --- a/xen/include/asm-x86/domain.h +++ b/xen/include/asm-x86/domain.h @@ -505,6 +505,9 @@ struct arch_vcpu * and thus should be saved/restored. */ bool_t nonlazy_xstate_used; + /* Restore all FPU state (lazy and non-lazy state) on context switch? */ + bool_t fully_eager_fpu; + struct vmce vmce; struct paging_vcpu paging;
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