On Mon, Aug 10, 2026 at 04:29:55PM +0800, Tina Zhang wrote: > Date: Mon, 10 Aug 2026 16:29:55 +0800 > From: Tina Zhang <[email protected]> > Subject: [PATCH v2 8/9] target/i386: Use AMD legacy cache fallback for Hygon > X-Mailer: git-send-email 2.43.7 > > When legacy-cache=on, x86_cpu_realizefn() builds a hardcoded cache > model. It selected the AMD legacy cache table only for CPUs with the > AuthenticAMD vendor ID. Dhyana uses the HygonGenuine vendor ID, so this > explicit compatibility path fell back to QEMU's old Intel legacy cache > table. > > The wrong table is visible through AMD extended cache leaves. With the > Intel legacy table, Dhyana reports 32 KiB, 8-way L1 caches in CPUID > 0x80000005 and a 4 MiB, 16-way L2 cache in CPUID 0x80000006. Linux > uses the AMD/Hygon cache enumeration path for Hygon and reads these AMD > extended cache leaves. > > Use the AMD legacy cache table for Hygon in this fallback path when the > new vendor CPU ABI is enabled. Keep the old fallback for pc-11.0 and
nit: pc-11.1. > older machine types through x-hygon-vendor-abi-fixes=false. Thanks, Zhao
