target/i386: add missing bits to CR4_RESERVED_MASK
Booting Fedora kernels with -cpu max hangs very early in boot. Disabling
the la57 CPUID bit fixes the problem. git bisect traced the regression to
commit 213ff024a2f92020290296cb9dc29c2af3d4a221 (HEAD, refs/bisect/bad)
Author: Lara Lazier <laramglazier@gmail.com>
Date: Wed Jul 21 17:26:50 2021 +0200
target/i386: Added consistency checks for CR4
All MBZ bits in CR4 must be zero. (APM2 15.5)
Added reserved bitmask and added checks in both
helper_vmrun and helper_write_crN.
Signed-off-by: Lara Lazier <laramglazier@gmail.com>
Message-Id: <20210721152651.14683-2-laramglazier@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
In this commit CR4_RESERVED_MASK is missing CR4_LA57_MASK and
two others. Adding this lets Fedora kernels boot once again.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <20210831175033.175584-1-berrange@redhat.com>
[Removed VMXE/SMXE, matching the commit message. - Paolo]
Fixes: 213ff024a2 ("target/i386: Added consistency checks for CR4", 2021-07-22)
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 69e3895f9d37ca39536775b13ce63e8c291427ba)
Signed-off-by: Michael Roth <michael.roth@amd.com>
1 file changed
