6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Gleixner tglx@linutronix.de
commit 6b072022ab2e1e83b7588144ee0080f7197b71da upstream
so it becomes less obfuscated and rename it because there is nothing generic about it.
Signed-off-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Borislav Petkov (AMD) bp@alien8.de Link: https://lore.kernel.org/r/20231002115902.330295409@linutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/microcode/intel.c | 47 ++++++++++++---------------------- 1 file changed, 17 insertions(+), 30 deletions(-)
--- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -240,19 +240,6 @@ int intel_microcode_sanity_check(void *m } EXPORT_SYMBOL_GPL(intel_microcode_sanity_check);
-/* - * Returns 1 if update has been found, 0 otherwise. - */ -static int has_newer_microcode(void *mc, unsigned int csig, int cpf, int new_rev) -{ - struct microcode_header_intel *mc_hdr = mc; - - if (mc_hdr->rev <= new_rev) - return 0; - - return intel_find_matching_signature(mc, csig, cpf); -} - static void save_microcode_patch(void *data, unsigned int size) { struct microcode_header_intel *p; @@ -559,14 +546,12 @@ out: return ret; }
-static enum ucode_state generic_load_microcode(int cpu, struct iov_iter *iter) +static enum ucode_state parse_microcode_blobs(int cpu, struct iov_iter *iter) { struct ucode_cpu_info *uci = ucode_cpu_info + cpu; unsigned int curr_mc_size = 0, new_mc_size = 0; - enum ucode_state ret = UCODE_OK; - int new_rev = uci->cpu_sig.rev; + int cur_rev = uci->cpu_sig.rev; u8 *new_mc = NULL, *mc = NULL; - unsigned int csig, cpf;
while (iov_iter_count(iter)) { struct microcode_header_intel mc_header; @@ -583,6 +568,7 @@ static enum ucode_state generic_load_mic pr_err("error! Bad data in microcode data file (totalsize too small)\n"); break; } + data_size = mc_size - sizeof(mc_header); if (data_size > iov_iter_count(iter)) { pr_err("error! Bad data in microcode data file (truncated file?)\n"); @@ -605,16 +591,17 @@ static enum ucode_state generic_load_mic break; }
- csig = uci->cpu_sig.sig; - cpf = uci->cpu_sig.pf; - if (has_newer_microcode(mc, csig, cpf, new_rev)) { - vfree(new_mc); - new_rev = mc_header.rev; - new_mc = mc; - new_mc_size = mc_size; - mc = NULL; /* trigger new vmalloc */ - ret = UCODE_NEW; - } + if (cur_rev >= mc_header.rev) + continue; + + if (!intel_find_matching_signature(mc, uci->cpu_sig.sig, uci->cpu_sig.pf)) + continue; + + vfree(new_mc); + cur_rev = mc_header.rev; + new_mc = mc; + new_mc_size = mc_size; + mc = NULL; }
vfree(mc); @@ -634,9 +621,9 @@ static enum ucode_state generic_load_mic save_microcode_patch(new_mc, new_mc_size);
pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n", - cpu, new_rev, uci->cpu_sig.rev); + cpu, cur_rev, uci->cpu_sig.rev);
- return ret; + return UCODE_NEW; }
static bool is_blacklisted(unsigned int cpu) @@ -685,7 +672,7 @@ static enum ucode_state request_microcod kvec.iov_base = (void *)firmware->data; kvec.iov_len = firmware->size; iov_iter_kvec(&iter, ITER_SOURCE, &kvec, 1, firmware->size); - ret = generic_load_microcode(cpu, &iter); + ret = parse_microcode_blobs(cpu, &iter);
release_firmware(firmware);