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linuxkm: add WOLFSSL_COMMERCIAL_LICENSE alternative to kernel_fpu_begin()/kernel_fpu_end() in save_vector_registers_x86()/restore_vector_registers_x86(): allocate wc_linuxkm_fpu_savebufs as a buffer for os_xsave()/os_xrstor(), and use fpregs_lock()/fpregs_unlock() to inhibit softirqs/preemption.

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This commit is contained in:
Daniel Pouzzner
2024-01-05 23:21:24 -06:00
parent d5d476a3a1
commit 9c36bb9073
3 changed files with 157 additions and 39 deletions
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40
linuxkm/module_hooks.c
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@@ -20,8 +20,12 @@
*/
#ifndef WOLFSSL_LICENSE
#ifdef WOLFSSL_COMMERCIAL_LICENSE
#define WOLFSSL_LICENSE "wolfSSL Commercial"
#else
#define WOLFSSL_LICENSE "GPL v2"
#endif
#endif
#define FIPS_NO_WRAPPERS
@@ -346,6 +350,17 @@ static int my_preempt_count(void) {
return preempt_count();
}
/* ditto for fpregs_lock/fpregs_unlock */
#ifdef WOLFSSL_LINUXKM_USE_SAVE_VECTOR_REGISTERS
static void my_fpregs_lock(void) {
fpregs_lock();
}
static void my_fpregs_unlock(void) {
fpregs_unlock();
}
#endif
static int set_up_wolfssl_linuxkm_pie_redirect_table(void) {
memset(
&wolfssl_linuxkm_pie_redirect_table,
@@ -442,21 +457,28 @@ static int set_up_wolfssl_linuxkm_pie_redirect_table(void) {
#endif
wolfssl_linuxkm_pie_redirect_table.nr_cpu_ids = &nr_cpu_ids;
#if defined(CONFIG_SMP) && (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 7, 0))
#if defined(CONFIG_SMP) && \
(LINUX_VERSION_CODE >= KERNEL_VERSION(5, 7, 0)) && \
!defined(WOLFSSL_COMMERCIAL_LICENSE)
wolfssl_linuxkm_pie_redirect_table.migrate_disable = &migrate_disable;
wolfssl_linuxkm_pie_redirect_table.migrate_enable = &migrate_enable;
#endif
#ifdef WOLFSSL_LINUXKM_SIMD_X86
wolfssl_linuxkm_pie_redirect_table.irq_fpu_usable = irq_fpu_usable;
#ifdef kernel_fpu_begin
wolfssl_linuxkm_pie_redirect_table.kernel_fpu_begin_mask =
kernel_fpu_begin_mask;
#else
wolfssl_linuxkm_pie_redirect_table.kernel_fpu_begin =
kernel_fpu_begin;
#endif
wolfssl_linuxkm_pie_redirect_table.kernel_fpu_end = kernel_fpu_end;
#ifdef WOLFSSL_COMMERCIAL_LICENSE
wolfssl_linuxkm_pie_redirect_table.fpregs_lock = my_fpregs_lock;
wolfssl_linuxkm_pie_redirect_table.fpregs_unlock = my_fpregs_unlock;
#else /* !defined(WOLFSSL_COMMERCIAL_LICENSE) */
#ifdef kernel_fpu_begin
wolfssl_linuxkm_pie_redirect_table.kernel_fpu_begin_mask =
kernel_fpu_begin_mask;
#else
wolfssl_linuxkm_pie_redirect_table.kernel_fpu_begin =
kernel_fpu_begin;
#endif
wolfssl_linuxkm_pie_redirect_table.kernel_fpu_end = kernel_fpu_end;
#endif /* !defined(WOLFSSL_COMMERCIAL_LICENSE) */
#endif /* WOLFSSL_LINUXKM_SIMD_X86 */
#endif /* WOLFSSL_LINUXKM_USE_SAVE_VECTOR_REGISTERS */