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-rw-r--r--arch/x86/kernel/fpu/xstate.c461
1 files changed, 461 insertions, 0 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
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index 000000000000..62fc001c7846
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+++ b/arch/x86/kernel/fpu/xstate.c
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+/*
+ * xsave/xrstor support.
+ *
+ * Author: Suresh Siddha <suresh.b.siddha@intel.com>
+ */
+#include <linux/compat.h>
+#include <linux/cpu.h>
+
+#include <asm/fpu/api.h>
+#include <asm/fpu/internal.h>
+#include <asm/fpu/signal.h>
+#include <asm/fpu/regset.h>
+
+#include <asm/tlbflush.h>
+
+static const char *xfeature_names[] =
+{
+ "x87 floating point registers" ,
+ "SSE registers" ,
+ "AVX registers" ,
+ "MPX bounds registers" ,
+ "MPX CSR" ,
+ "AVX-512 opmask" ,
+ "AVX-512 Hi256" ,
+ "AVX-512 ZMM_Hi256" ,
+ "unknown xstate feature" ,
+};
+
+/*
+ * Mask of xstate features supported by the CPU and the kernel:
+ */
+u64 xfeatures_mask __read_mostly;
+
+static unsigned int xstate_offsets[XFEATURES_NR_MAX] = { [ 0 ... XFEATURES_NR_MAX - 1] = -1};
+static unsigned int xstate_sizes[XFEATURES_NR_MAX] = { [ 0 ... XFEATURES_NR_MAX - 1] = -1};
+static unsigned int xstate_comp_offsets[sizeof(xfeatures_mask)*8];
+
+/* The number of supported xfeatures in xfeatures_mask: */
+static unsigned int xfeatures_nr;
+
+/*
+ * Return whether the system supports a given xfeature.
+ *
+ * Also return the name of the (most advanced) feature that the caller requested:
+ */
+int cpu_has_xfeatures(u64 xfeatures_needed, const char **feature_name)
+{
+ u64 xfeatures_missing = xfeatures_needed & ~xfeatures_mask;
+
+ if (unlikely(feature_name)) {
+ long xfeature_idx, max_idx;
+ u64 xfeatures_print;
+ /*
+ * So we use FLS here to be able to print the most advanced
+ * feature that was requested but is missing. So if a driver
+ * asks about "XSTATE_SSE | XSTATE_YMM" we'll print the
+ * missing AVX feature - this is the most informative message
+ * to users:
+ */
+ if (xfeatures_missing)
+ xfeatures_print = xfeatures_missing;
+ else
+ xfeatures_print = xfeatures_needed;
+
+ xfeature_idx = fls64(xfeatures_print)-1;
+ max_idx = ARRAY_SIZE(xfeature_names)-1;
+ xfeature_idx = min(xfeature_idx, max_idx);
+
+ *feature_name = xfeature_names[xfeature_idx];
+ }
+
+ if (xfeatures_missing)
+ return 0;
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(cpu_has_xfeatures);
+
+/*
+ * When executing XSAVEOPT (or other optimized XSAVE instructions), if
+ * a processor implementation detects that an FPU state component is still
+ * (or is again) in its initialized state, it may clear the corresponding
+ * bit in the header.xfeatures field, and can skip the writeout of registers
+ * to the corresponding memory layout.
+ *
+ * This means that when the bit is zero, the state component might still contain
+ * some previous - non-initialized register state.
+ *
+ * Before writing xstate information to user-space we sanitize those components,
+ * to always ensure that the memory layout of a feature will be in the init state
+ * if the corresponding header bit is zero. This is to ensure that user-space doesn't
+ * see some stale state in the memory layout during signal handling, debugging etc.
+ */
+void fpstate_sanitize_xstate(struct fpu *fpu)
+{
+ struct fxregs_state *fx = &fpu->state.fxsave;
+ int feature_bit;
+ u64 xfeatures;
+
+ if (!use_xsaveopt())
+ return;
+
+ xfeatures = fpu->state.xsave.header.xfeatures;
+
+ /*
+ * None of the feature bits are in init state. So nothing else
+ * to do for us, as the memory layout is up to date.
+ */
+ if ((xfeatures & xfeatures_mask) == xfeatures_mask)
+ return;
+
+ /*
+ * FP is in init state
+ */
+ if (!(xfeatures & XSTATE_FP)) {
+ fx->cwd = 0x37f;
+ fx->swd = 0;
+ fx->twd = 0;
+ fx->fop = 0;
+ fx->rip = 0;
+ fx->rdp = 0;
+ memset(&fx->st_space[0], 0, 128);
+ }
+
+ /*
+ * SSE is in init state
+ */
+ if (!(xfeatures & XSTATE_SSE))
+ memset(&fx->xmm_space[0], 0, 256);
+
+ /*
+ * First two features are FPU and SSE, which above we handled
+ * in a special way already:
+ */
+ feature_bit = 0x2;
+ xfeatures = (xfeatures_mask & ~xfeatures) >> 2;
+
+ /*
+ * Update all the remaining memory layouts according to their
+ * standard xstate layout, if their header bit is in the init
+ * state:
+ */
+ while (xfeatures) {
+ if (xfeatures & 0x1) {
+ int offset = xstate_offsets[feature_bit];
+ int size = xstate_sizes[feature_bit];
+
+ memcpy((void *)fx + offset,
+ (void *)&init_fpstate.xsave + offset,
+ size);
+ }
+
+ xfeatures >>= 1;
+ feature_bit++;
+ }
+}
+
+/*
+ * Enable the extended processor state save/restore feature.
+ * Called once per CPU onlining.
+ */
+void fpu__init_cpu_xstate(void)
+{
+ if (!cpu_has_xsave || !xfeatures_mask)
+ return;
+
+ cr4_set_bits(X86_CR4_OSXSAVE);
+ xsetbv(XCR_XFEATURE_ENABLED_MASK, xfeatures_mask);
+}
+
+/*
+ * Record the offsets and sizes of various xstates contained
+ * in the XSAVE state memory layout.
+ *
+ * ( Note that certain features might be non-present, for them
+ * we'll have 0 offset and 0 size. )
+ */
+static void __init setup_xstate_features(void)
+{
+ u32 eax, ebx, ecx, edx, leaf;
+
+ xfeatures_nr = fls64(xfeatures_mask);
+
+ for (leaf = 2; leaf < xfeatures_nr; leaf++) {
+ cpuid_count(XSTATE_CPUID, leaf, &eax, &ebx, &ecx, &edx);
+
+ xstate_offsets[leaf] = ebx;
+ xstate_sizes[leaf] = eax;
+
+ printk(KERN_INFO "x86/fpu: xstate_offset[%d]: %04x, xstate_sizes[%d]: %04x\n", leaf, ebx, leaf, eax);
+ }
+}
+
+static void __init print_xstate_feature(u64 xstate_mask)
+{
+ const char *feature_name;
+
+ if (cpu_has_xfeatures(xstate_mask, &feature_name))
+ pr_info("x86/fpu: Supporting XSAVE feature 0x%02Lx: '%s'\n", xstate_mask, feature_name);
+}
+
+/*
+ * Print out all the supported xstate features:
+ */
+static void __init print_xstate_features(void)
+{
+ print_xstate_feature(XSTATE_FP);
+ print_xstate_feature(XSTATE_SSE);
+ print_xstate_feature(XSTATE_YMM);
+ print_xstate_feature(XSTATE_BNDREGS);
+ print_xstate_feature(XSTATE_BNDCSR);
+ print_xstate_feature(XSTATE_OPMASK);
+ print_xstate_feature(XSTATE_ZMM_Hi256);
+ print_xstate_feature(XSTATE_Hi16_ZMM);
+}
+
+/*
+ * This function sets up offsets and sizes of all extended states in
+ * xsave area. This supports both standard format and compacted format
+ * of the xsave aread.
+ */
+static void __init setup_xstate_comp(void)
+{
+ unsigned int xstate_comp_sizes[sizeof(xfeatures_mask)*8];
+ int i;
+
+ /*
+ * The FP xstates and SSE xstates are legacy states. They are always
+ * in the fixed offsets in the xsave area in either compacted form
+ * or standard form.
+ */
+ xstate_comp_offsets[0] = 0;
+ xstate_comp_offsets[1] = offsetof(struct fxregs_state, xmm_space);
+
+ if (!cpu_has_xsaves) {
+ for (i = 2; i < xfeatures_nr; i++) {
+ if (test_bit(i, (unsigned long *)&xfeatures_mask)) {
+ xstate_comp_offsets[i] = xstate_offsets[i];
+ xstate_comp_sizes[i] = xstate_sizes[i];
+ }
+ }
+ return;
+ }
+
+ xstate_comp_offsets[2] = FXSAVE_SIZE + XSAVE_HDR_SIZE;
+
+ for (i = 2; i < xfeatures_nr; i++) {
+ if (test_bit(i, (unsigned long *)&xfeatures_mask))
+ xstate_comp_sizes[i] = xstate_sizes[i];
+ else
+ xstate_comp_sizes[i] = 0;
+
+ if (i > 2)
+ xstate_comp_offsets[i] = xstate_comp_offsets[i-1]
+ + xstate_comp_sizes[i-1];
+
+ }
+}
+
+/*
+ * setup the xstate image representing the init state
+ */
+static void __init setup_init_fpu_buf(void)
+{
+ static int on_boot_cpu = 1;
+
+ WARN_ON_FPU(!on_boot_cpu);
+ on_boot_cpu = 0;
+
+ if (!cpu_has_xsave)
+ return;
+
+ setup_xstate_features();
+ print_xstate_features();
+
+ if (cpu_has_xsaves) {
+ init_fpstate.xsave.header.xcomp_bv = (u64)1 << 63 | xfeatures_mask;
+ init_fpstate.xsave.header.xfeatures = xfeatures_mask;
+ }
+
+ /*
+ * Init all the features state with header_bv being 0x0
+ */
+ copy_kernel_to_xregs_booting(&init_fpstate.xsave);
+
+ /*
+ * Dump the init state again. This is to identify the init state
+ * of any feature which is not represented by all zero's.
+ */
+ copy_xregs_to_kernel_booting(&init_fpstate.xsave);
+}
+
+/*
+ * Calculate total size of enabled xstates in XCR0/xfeatures_mask.
+ */
+static void __init init_xstate_size(void)
+{
+ unsigned int eax, ebx, ecx, edx;
+ int i;
+
+ if (!cpu_has_xsaves) {
+ cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
+ xstate_size = ebx;
+ return;
+ }
+
+ xstate_size = FXSAVE_SIZE + XSAVE_HDR_SIZE;
+ for (i = 2; i < 64; i++) {
+ if (test_bit(i, (unsigned long *)&xfeatures_mask)) {
+ cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);
+ xstate_size += eax;
+ }
+ }
+}
+
+/*
+ * Enable and initialize the xsave feature.
+ * Called once per system bootup.
+ */
+void __init fpu__init_system_xstate(void)
+{
+ unsigned int eax, ebx, ecx, edx;
+ static int on_boot_cpu = 1;
+
+ WARN_ON_FPU(!on_boot_cpu);
+ on_boot_cpu = 0;
+
+ if (!cpu_has_xsave) {
+ pr_info("x86/fpu: Legacy x87 FPU detected.\n");
+ return;
+ }
+
+ if (boot_cpu_data.cpuid_level < XSTATE_CPUID) {
+ WARN_ON_FPU(1);
+ return;
+ }
+
+ cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
+ xfeatures_mask = eax + ((u64)edx << 32);
+
+ if ((xfeatures_mask & XSTATE_FPSSE) != XSTATE_FPSSE) {
+ pr_err("x86/fpu: FP/SSE not present amongst the CPU's xstate features: 0x%llx.\n", xfeatures_mask);
+ BUG();
+ }
+
+ /* Support only the state known to the OS: */
+ xfeatures_mask = xfeatures_mask & XCNTXT_MASK;
+
+ /* Enable xstate instructions to be able to continue with initialization: */
+ fpu__init_cpu_xstate();
+
+ /* Recompute the context size for enabled features: */
+ init_xstate_size();
+
+ update_regset_xstate_info(xstate_size, xfeatures_mask);
+ fpu__init_prepare_fx_sw_frame();
+ setup_init_fpu_buf();
+ setup_xstate_comp();
+
+ pr_info("x86/fpu: Enabled xstate features 0x%llx, context size is 0x%x bytes, using '%s' format.\n",
+ xfeatures_mask,
+ xstate_size,
+ cpu_has_xsaves ? "compacted" : "standard");
+}
+
+/*
+ * Restore minimal FPU state after suspend:
+ */
+void fpu__resume_cpu(void)
+{
+ /*
+ * Restore XCR0 on xsave capable CPUs:
+ */
+ if (cpu_has_xsave)
+ xsetbv(XCR_XFEATURE_ENABLED_MASK, xfeatures_mask);
+}
+
+/*
+ * Given the xsave area and a state inside, this function returns the
+ * address of the state.
+ *
+ * This is the API that is called to get xstate address in either
+ * standard format or compacted format of xsave area.
+ *
+ * Note that if there is no data for the field in the xsave buffer
+ * this will return NULL.
+ *
+ * Inputs:
+ * xstate: the thread's storage area for all FPU data
+ * xstate_feature: state which is defined in xsave.h (e.g.
+ * XSTATE_FP, XSTATE_SSE, etc...)
+ * Output:
+ * address of the state in the xsave area, or NULL if the
+ * field is not present in the xsave buffer.
+ */
+void *get_xsave_addr(struct xregs_state *xsave, int xstate_feature)
+{
+ int feature_nr = fls64(xstate_feature) - 1;
+ /*
+ * Do we even *have* xsave state?
+ */
+ if (!boot_cpu_has(X86_FEATURE_XSAVE))
+ return NULL;
+
+ xsave = &current->thread.fpu.state.xsave;
+ /*
+ * We should not ever be requesting features that we
+ * have not enabled. Remember that pcntxt_mask is
+ * what we write to the XCR0 register.
+ */
+ WARN_ONCE(!(xfeatures_mask & xstate_feature),
+ "get of unsupported state");
+ /*
+ * This assumes the last 'xsave*' instruction to
+ * have requested that 'xstate_feature' be saved.
+ * If it did not, we might be seeing and old value
+ * of the field in the buffer.
+ *
+ * This can happen because the last 'xsave' did not
+ * request that this feature be saved (unlikely)
+ * or because the "init optimization" caused it
+ * to not be saved.
+ */
+ if (!(xsave->header.xfeatures & xstate_feature))
+ return NULL;
+
+ return (void *)xsave + xstate_comp_offsets[feature_nr];
+}
+EXPORT_SYMBOL_GPL(get_xsave_addr);
+
+/*
+ * This wraps up the common operations that need to occur when retrieving
+ * data from xsave state. It first ensures that the current task was
+ * using the FPU and retrieves the data in to a buffer. It then calculates
+ * the offset of the requested field in the buffer.
+ *
+ * This function is safe to call whether the FPU is in use or not.
+ *
+ * Note that this only works on the current task.
+ *
+ * Inputs:
+ * @xsave_state: state which is defined in xsave.h (e.g. XSTATE_FP,
+ * XSTATE_SSE, etc...)
+ * Output:
+ * address of the state in the xsave area or NULL if the state
+ * is not present or is in its 'init state'.
+ */
+const void *get_xsave_field_ptr(int xsave_state)
+{
+ struct fpu *fpu = &current->thread.fpu;
+
+ if (!fpu->fpstate_active)
+ return NULL;
+ /*
+ * fpu__save() takes the CPU's xstate registers
+ * and saves them off to the 'fpu memory buffer.
+ */
+ fpu__save(fpu);
+
+ return get_xsave_addr(&fpu->state.xsave, xsave_state);
+}