[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] x86emul: respect NSCB
commit 87a20c98d9f0f422727fe9b4b9e22c2c43a5cd9c Author: Jan Beulich <jbeulich@xxxxxxxx> AuthorDate: Tue Oct 11 14:30:41 2022 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Tue Oct 11 14:30:41 2022 +0200 x86emul: respect NSCB protmode_load_seg() would better adhere to that "feature" of clearing base (and limit) during NULL selector loads. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Release-acked-by: Henry Wang <Henry.Wang@xxxxxxx> --- xen/arch/x86/x86_emulate/x86_emulate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c b/xen/arch/x86/x86_emulate/x86_emulate.c index f6778dd493..e38f98b547 100644 --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -1970,6 +1970,7 @@ amd_like(const struct x86_emulate_ctxt *ctxt) #define vcpu_has_tbm() (ctxt->cpuid->extd.tbm) #define vcpu_has_clzero() (ctxt->cpuid->extd.clzero) #define vcpu_has_wbnoinvd() (ctxt->cpuid->extd.wbnoinvd) +#define vcpu_has_nscb() (ctxt->cpuid->extd.nscb) #define vcpu_has_bmi1() (ctxt->cpuid->feat.bmi1) #define vcpu_has_hle() (ctxt->cpuid->feat.hle) @@ -2102,7 +2103,7 @@ protmode_load_seg( case x86_seg_tr: goto raise_exn; } - if ( !_amd_like(cp) || !ops->read_segment || + if ( !_amd_like(cp) || vcpu_has_nscb() || !ops->read_segment || ops->read_segment(seg, sreg, ctxt) != X86EMUL_OKAY ) memset(sreg, 0, sizeof(*sreg)); else -- generated by git-patchbot for /home/xen/git/xen.git#staging
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