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x86/fpu/xstate: Add supervisor PASID state for ENQCMD 

The ENQCMD instruction reads a PASID from the IA32_PASID MSR. The
MSR is stored in the task's supervisor XSAVE* PASID state and is
context-switched by XSAVES/XRSTORS.

 [ bp: Add (in-)definite articles and massage. ]

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/1600187413-163670-6-git-send-email-fenghua.yu@intel.com
This commit is contained in:
Yu-cheng Yu 2020-09-15 09:30:09 -07:00 committed by Borislav Petkov
parent ff4f82816d
commit b454feb9ab
3 changed files with 16 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/x86/include/asm/fpu/types.h
View File

@ -114,7 +114,7 @@ enum xfeature {
XFEATURE_Hi16_ZMM,
XFEATURE_PT_UNIMPLEMENTED_SO_FAR,
XFEATURE_PKRU,
XFEATURE_RSRVD_COMP_10,
XFEATURE_PASID,
XFEATURE_RSRVD_COMP_11,
XFEATURE_RSRVD_COMP_12,
XFEATURE_RSRVD_COMP_13,
@ -134,6 +134,7 @@ enum xfeature {
#define XFEATURE_MASK_Hi16_ZMM (1 << XFEATURE_Hi16_ZMM)
#define XFEATURE_MASK_PT (1 << XFEATURE_PT_UNIMPLEMENTED_SO_FAR)
#define XFEATURE_MASK_PKRU (1 << XFEATURE_PKRU)
#define XFEATURE_MASK_PASID (1 << XFEATURE_PASID)
#define XFEATURE_MASK_LBR (1 << XFEATURE_LBR)
#define XFEATURE_MASK_FPSSE (XFEATURE_MASK_FP | XFEATURE_MASK_SSE)
@ -256,6 +257,14 @@ struct arch_lbr_state {
struct lbr_entry entries[];
} __packed;
/*
* State component 10 is supervisor state used for context-switching the
* PASID state.
*/
struct ia32_pasid_state {
u64 pasid;
} __packed;
struct xstate_header {
u64 xfeatures;
u64 xcomp_bv;

2
arch/x86/include/asm/fpu/xstate.h
View File

@ -35,7 +35,7 @@
XFEATURE_MASK_BNDCSR)
/* All currently supported supervisor features */
#define XFEATURE_MASK_SUPERVISOR_SUPPORTED (0)
#define XFEATURE_MASK_SUPERVISOR_SUPPORTED (XFEATURE_MASK_PASID)
/*
* A supervisor state component may not always contain valuable information,

6
arch/x86/kernel/fpu/xstate.c
View File

@ -37,6 +37,7 @@ static const char *xfeature_names[] =
"AVX-512 ZMM_Hi256" ,
"Processor Trace (unused)" ,
"Protection Keys User registers",
"PASID state",
"unknown xstate feature" ,
};
@ -51,6 +52,7 @@ static short xsave_cpuid_features[] __initdata = {
X86_FEATURE_AVX512F,
X86_FEATURE_INTEL_PT,
X86_FEATURE_PKU,
X86_FEATURE_ENQCMD,
};
/*
@ -318,6 +320,7 @@ static void __init print_xstate_features(void)
print_xstate_feature(XFEATURE_MASK_ZMM_Hi256);
print_xstate_feature(XFEATURE_MASK_Hi16_ZMM);
print_xstate_feature(XFEATURE_MASK_PKRU);
print_xstate_feature(XFEATURE_MASK_PASID);
}
/*
@ -592,6 +595,7 @@ static void check_xstate_against_struct(int nr)
XCHECK_SZ(sz, nr, XFEATURE_ZMM_Hi256, struct avx_512_zmm_uppers_state);
XCHECK_SZ(sz, nr, XFEATURE_Hi16_ZMM, struct avx_512_hi16_state);
XCHECK_SZ(sz, nr, XFEATURE_PKRU, struct pkru_state);
XCHECK_SZ(sz, nr, XFEATURE_PASID, struct ia32_pasid_state);
/*
* Make *SURE* to add any feature numbers in below if
@ -601,7 +605,7 @@ static void check_xstate_against_struct(int nr)
if ((nr < XFEATURE_YMM) ||
(nr >= XFEATURE_MAX) ||
(nr == XFEATURE_PT_UNIMPLEMENTED_SO_FAR) ||
((nr >= XFEATURE_RSRVD_COMP_10) && (nr <= XFEATURE_LBR))) {
((nr >= XFEATURE_RSRVD_COMP_11) && (nr <= XFEATURE_LBR))) {
WARN_ONCE(1, "no structure for xstate: %d\n", nr);
XSTATE_WARN_ON(1);
}