diff mbox series

[PULL,02/25] i386/cpu: fixup number of addressable IDs for processor cores in the physical package

Message ID 20240611142524.83762-3-pbonzini@redhat.com
State New
Headers show
Series [PULL,01/25] scsi-disk: Fix crash for VM configured with USB CDROM after live migration | expand

Commit Message

Paolo Bonzini June 11, 2024, 2:25 p.m. UTC 
From: Chuang Xu <xuchuangxclwt@bytedance.com>

When QEMU is started with:
-cpu host,host-cache-info=on,l3-cache=off \
-smp 2,sockets=1,dies=1,cores=1,threads=2
Guest can't acquire maximum number of addressable IDs for processor cores in
the physical package from CPUID[04H].

When creating a CPU topology of 1 core per package, host-cache-info only
uses the Host's addressable core IDs field (CPUID.04H.EAX[bits 31-26]),
resulting in a conflict (on the multicore Host) between the Guest core
topology information in this field and the Guest's actual cores number.

Fix it by removing the unnecessary condition to cover 1 core per package
case. This is safe because cores_per_pkg will not be 0 and will be at
least 1.

Fixes: d7caf13b5fcf ("x86: cpu: fixup number of addressable IDs for logical processors sharing cache")
Signed-off-by: Guixiong Wei <weiguixiong@bytedance.com>
Signed-off-by: Yipeng Yin <yinyipeng@bytedance.com>
Signed-off-by: Chuang Xu <xuchuangxclwt@bytedance.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-ID: <20240611032314.64076-1-xuchuangxclwt@bytedance.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/cpu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 7466217d5ea..365852cb99e 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6455,10 +6455,8 @@  void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
             if (*eax & 31) {
                 int host_vcpus_per_cache = 1 + ((*eax & 0x3FFC000) >> 14);
 
-                if (cores_per_pkg > 1) {
-                    *eax &= ~0xFC000000;
-                    *eax |= max_core_ids_in_package(&topo_info) << 26;
-                }
+                *eax &= ~0xFC000000;
+                *eax |= max_core_ids_in_package(&topo_info) << 26;
                 if (host_vcpus_per_cache > threads_per_pkg) {
                     *eax &= ~0x3FFC000;