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accel/mshv: disable la57 (5lvl paging)

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This change disable la57 paging on the mshv hypervisor on both the
mshv processor feature bitmap and mask the cpuid feature leaf to the
guest.

Since the removal of hypervisor-assisted gva=>gpa translation in
1c85a4a3d7 we have seen MMIO errors in guests on la57-enabled hw. We
will have to investigate and test this further.

Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
Reviewed-by: Doru Blânzeanu <dblanzeanu@linux.microsoft.com>
Link: https://lore.kernel.org/r/20260416121116.527927-10-magnuskulke@linux.microsoft.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Magnus Kulke
2026-04-16 14:11:16 +02:00
committed by Paolo Bonzini
parent 9c961adc87
commit e7c9532d89
3 changed files with 24 additions and 0 deletions
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7
accel/mshv/mshv-all.c
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@@ -142,6 +142,8 @@ static int create_partition(int mshv_fd, int *vm_fd)
int ret;
uint64_t pt_flags, host_proc_features;
union hv_partition_processor_xsave_features disabled_xsave_features;
union hv_partition_processor_features disabled_partition_features = {0};
struct mshv_create_partition_v2 args = {0};
QEMU_BUILD_BUG_ON(MSHV_NUM_CPU_FEATURES_BANKS != 2);
@@ -177,6 +179,11 @@ static int create_partition(int mshv_fd, int *vm_fd)
}
args.pt_cpu_fbanks[1] = ~host_proc_features;
/* arch-specific features we disable regardless of host support */
mshv_arch_disable_partition_proc_features(&disabled_partition_features);
args.pt_cpu_fbanks[0] |= disabled_partition_features.as_uint64[0];
args.pt_cpu_fbanks[1] |= disabled_partition_features.as_uint64[1];
/* populate args structure */
args.pt_flags = pt_flags;
args.pt_isolation = MSHV_PT_ISOLATION_NONE;