[xen stable-4.18] x86/amd: Extend CPU erratum #1474 fix to more affected models

[patchbot@xxxxxxx]

commit 62b3d7f8e45a7ec1597f0ed61a99d1f423b22315
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Thu Feb 1 17:58:17 2024 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 1 17:58:17 2024 +0100

    x86/amd: Extend CPU erratum #1474 fix to more affected models
    
    Erratum #1474 has now been extended to cover models from family 17h ranges
    00-2Fh, so the errata now covers all the models released under Family
    17h (Zen, Zen+ and Zen2).
    
    Additionally extend the workaround to Family 18h (Hygon), since it's based 
on
    the Zen architecture and very likely affected.
    
    Rename all the zen2 related symbols to fam17, since the errata doesn't
    exclusively affect Zen2 anymore.
    
    Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 23db507a01a4ec5259ec0ab43d296a41b1c326ba
    master date: 2023-12-21 12:19:40 +0000
---
 xen/arch/x86/cpu/amd.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/xen/arch/x86/cpu/amd.c b/xen/arch/x86/cpu/amd.c
index 0f305312ff..d43288ae97 100644
--- a/xen/arch/x86/cpu/amd.c
+++ b/xen/arch/x86/cpu/amd.c
@@ -54,7 +54,7 @@ bool __read_mostly amd_acpi_c1e_quirk;
 bool __ro_after_init amd_legacy_ssbd;
 bool __initdata amd_virt_spec_ctrl;
 
-static bool __read_mostly zen2_c6_disabled;
+static bool __read_mostly fam17_c6_disabled;
 
 static inline int rdmsr_amd_safe(unsigned int msr, unsigned int *lo,
                                 unsigned int *hi)
@@ -978,24 +978,24 @@ void amd_check_zenbleed(void)
                       val & chickenbit ? "chickenbit" : "microcode");
 }
 
-static void cf_check zen2_disable_c6(void *arg)
+static void cf_check fam17_disable_c6(void *arg)
 {
        /* Disable C6 by clearing the CCR{0,1,2}_CC6EN bits. */
        const uint64_t mask = ~((1ul << 6) | (1ul << 14) | (1ul << 22));
        uint64_t val;
 
-       if (!zen2_c6_disabled) {
+       if (!fam17_c6_disabled) {
                printk(XENLOG_WARNING
     "Disabling C6 after 1000 days apparent uptime due to AMD errata 1474\n");
-               zen2_c6_disabled = true;
+               fam17_c6_disabled = true;
                /*
                 * Prevent CPU hotplug so that started CPUs will either see
-                * zen2_c6_disabled set, or will be handled by
+                * zen_c6_disabled set, or will be handled by
                 * smp_call_function().
                 */
                while (!get_cpu_maps())
                        process_pending_softirqs();
-               smp_call_function(zen2_disable_c6, NULL, 0);
+               smp_call_function(fam17_disable_c6, NULL, 0);
                put_cpu_maps();
        }
 
@@ -1294,8 +1294,8 @@ static void cf_check init_amd(struct cpuinfo_x86 *c)
        amd_check_zenbleed();
        amd_check_erratum_1485();
 
-       if (zen2_c6_disabled)
-               zen2_disable_c6(NULL);
+       if (fam17_c6_disabled)
+               fam17_disable_c6(NULL);
 
        check_syscfg_dram_mod_en();
 
@@ -1307,7 +1307,7 @@ const struct cpu_dev amd_cpu_dev = {
        .c_init         = init_amd,
 };
 
-static int __init cf_check zen2_c6_errata_check(void)
+static int __init cf_check amd_check_erratum_1474(void)
 {
        /*
         * Errata #1474: A Core May Hang After About 1044 Days
@@ -1315,7 +1315,8 @@ static int __init cf_check zen2_c6_errata_check(void)
         */
        s_time_t delta;
 
-       if (cpu_has_hypervisor || boot_cpu_data.x86 != 0x17 || !is_zen2_uarch())
+       if (cpu_has_hypervisor ||
+           (boot_cpu_data.x86 != 0x17 && boot_cpu_data.x86 != 0x18))
                return 0;
 
        /*
@@ -1330,10 +1331,10 @@ static int __init cf_check zen2_c6_errata_check(void)
        if (delta > 0) {
                static struct timer errata_c6;
 
-               init_timer(&errata_c6, zen2_disable_c6, NULL, 0);
+               init_timer(&errata_c6, fam17_disable_c6, NULL, 0);
                set_timer(&errata_c6, NOW() + delta);
        } else
-               zen2_disable_c6(NULL);
+               fam17_disable_c6(NULL);
 
        return 0;
 }
@@ -1341,4 +1342,4 @@ static int __init cf_check zen2_c6_errata_check(void)
  * Must be executed after early_time_init() for tsc_ticks2ns() to have been
  * calibrated.  That prevents us doing the check in init_amd().
  */
-presmp_initcall(zen2_c6_errata_check);
+presmp_initcall(amd_check_erratum_1474);
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.18