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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/hypervisor/1904317
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloademulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
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add deepseek and gemma results
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+
+cpu feature selection is not affected to guest 's cpuid with whpx
+
+On windows with -accel whpx, "-cpu" is ignored without any messages.
+Guest recognizes features as same as host's.
+
+Confirmed on v5.2.0-rc1.
+
+I suggest qemu may do,
+
+- Warn with incompatible -cpu options were given.
+- Enhance cpuid handling.
+
+Background:
+I was investigated mmio and block copy issue in Linux kernel.
+I met a problem that Linux went ill for touching mmio with whpx. (not with tcg)
+I suspect erms(enhanced rep movs) might trigger.
+I tried to mask erms on qemu with -feature,erms, but it was ineffective.
+
+At last, I disabled erms manually, to tweak whpx-all.c to mask erms in cpuid.
+
+FYI, qemu with whpx from/to mmio, "rep movsb" does byte access regardless of erms.
+Linux kernel tends to choose not "rep movsq" but "rep movsb" with erms.
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