hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/release-management/issues/IBV2E4 -------------------------------- In guest VM, ID register is needed to do VM migration, but currently 920G do not have an ID register to identify hardware xcall/xint feature, which will be supported by AIDR_EL1.xcall in the next generation, so check the bit for non-920G hardware and do not enable xcall/xint in guest for 920G to avoid the problem in guest. Fixes: 7f2e02718bba ("arm64: entry: Support hardware xcall and xint") Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> --- arch/arm64/kernel/cpufeature.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 5c9d2f98e488..8d4c913d699c 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2443,15 +2443,35 @@ static void mpam_extra_caps(void) #include <asm/xcall.h> DEFINE_STATIC_KEY_FALSE(xcall_enable); +#define AIDR_ELx_XCALL_SHIFT 32 +#define AIDR_ELx_XCALL (UL(1) << AIDR_ELx_XCALL_SHIFT) + static bool is_arch_xcall_xint_support(void) { + u64 aidr_el1 = read_sysreg_s(SYS_AIDR_EL1); + u64 el = read_sysreg(CurrentEL); + /* List of CPUs that support Xcall/Xint */ - static const struct midr_range xcall_xint_cpus[] = { + static const struct midr_range kunpeng_920g_cpus[] = { MIDR_ALL_VERSIONS(MIDR_HISI_HIP12), { /* sentinel */ } }; - if (is_midr_in_range_list(read_cpuid_id(), xcall_xint_cpus)) + if (is_midr_in_range_list(read_cpuid_id(), kunpeng_920g_cpus)) { + if (el == CurrentEL_EL2) + return true; + else + return false; + } + + /* + * Before 1650v100, AIDR[33:32] is reserved zero, Xcall/Xint v1 + * is not supported. + * + * After 1650v100, if AIDR[33:32] = 0x01, Xcall/Xint v1 and v2 + * is supported, else if AIDR[33:32] = 0x0, none of them supported. + */ + if (aidr_el1 & AIDR_ELx_XCALL) return true; return false; -- 2.34.1