On Wed, Aug 31, 2022 at 02:50:58PM +0200, Gerd Hoffmann wrote: > The KVM_HINTS_HOST_PHYS_BITS bit indicates that qemu has host-phys-bits > turned on. This implies the guest can actually work with the full > available physical address space as advertised by CPUID(0x80000008). > > Temporary hack for RfC patch and testing. This change must actually be > done in the linux kernel, then picked up by qemu via header file sync. > > Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> > --- > include/standard-headers/asm-x86/kvm_para.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/include/standard-headers/asm-x86/kvm_para.h b/include/standard-headers/asm-x86/kvm_para.h > index f0235e58a1d3..105b958c0f56 100644 > --- a/include/standard-headers/asm-x86/kvm_para.h > +++ b/include/standard-headers/asm-x86/kvm_para.h > @@ -37,7 +37,8 @@ > #define KVM_FEATURE_HC_MAP_GPA_RANGE 16 > #define KVM_FEATURE_MIGRATION_CONTROL 17 > > -#define KVM_HINTS_REALTIME 0 > +#define KVM_HINTS_REALTIME 0 > +#define KVM_HINTS_HOST_PHYS_BITS 1 > > /* The last 8 bits are used to indicate how to interpret the flags field > * in pvclock structure. If no bits are set, all flags are ignored. Just a clarification. I think what the bit means is that physical address size data in cpuid is valid. Accordingly I would rename it to +#define KVM_HINTS_PHYS_ADDRESS_SIZE_DATA_VALID 1 or some such. > -- > 2.37.2
