linux-kernel - Re: [PATCH 1/3] kvm: wire up KVM_CAP_VM_GPA

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Message-ID: <vlr6f5dnyhb6aw5si6m4vxqemwoyg7lrti7pdy4jzatady5mgr@bv44qwgk6ppu>
Date: Mon, 4 Mar 2024 09:43:53 +0100
From: Gerd Hoffmann <kraxel@...hat.com>
To: Tao Su <tao1.su@...ux.intel.com>
Cc: kvm@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, 
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, 
	"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] kvm: wire up KVM_CAP_VM_GPA_BITS for x86

> > +	kvm_caps.guest_phys_bits = boot_cpu_data.x86_phys_bits;
> 
> When KeyID_bits is non-zero, MAXPHYADDR != boot_cpu_data.x86_phys_bits
> here, you can check in detect_tme().

from detect_tme():

        /*
         * KeyID bits effectively lower the number of physical address
         * bits.  Update cpuinfo_x86::x86_phys_bits accordingly.
         */
        c->x86_phys_bits -= keyid_bits;

This looks like x86_phys_bits gets adjusted if needed.

take care,
  Gerd