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Tsirkin" To: Gerd Hoffmann Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Marcelo Tosatti , Marcel Apfelbaum , Eduardo Habkost , Paolo Bonzini , Richard Henderson , Sergio Lopez Subject: Re: [PATCH 1/2] [hack] reserve bit KVM_HINTS_HOST_PHYS_BITS Message-ID: <20220831090215-mutt-send-email-mst@kernel.org> References: <20220831125059.170032-1-kraxel@redhat.com> <20220831125059.170032-2-kraxel@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220831125059.170032-2-kraxel@redhat.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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 > --- > 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