Commit 412a3c41 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: cpuid: set CPUID(EAX=0xd,ECX=1).EBX correctly 



This is the size of the XSAVES area.  This starts providing guest support
for XSAVES (with no support yet for supervisor states, i.e. XSS == 0
always in guests for now).

Wanpeng Li suggested testing XSAVEC as well as XSAVES, since in practice
no real processor exists that only has one of them, and there is no
other way for userspace programs to compute the area of the XSAVEC
save area.  CPUID(EAX=0xd,ECX=1).EBX provides an upper bound.

Suggested-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Reviewed-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Tested-by: default avatarWanpeng Li <wanpeng.li@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 55412b2e

arch/x86/kvm/cpuid.c

+16 −6
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ 
#include "mmu.h"

#include "trace.h"



static u32 xstate_required_size(u64 xstate_bv)

static u32 xstate_required_size(u64 xstate_bv, bool compacted)

{

	int feature_bit = 0;

	u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
@@ -31,9 +31,10 @@ static u32 xstate_required_size(u64 xstate_bv) 
	xstate_bv &= XSTATE_EXTEND_MASK;

	while (xstate_bv) {

		if (xstate_bv & 0x1) {

		        u32 eax, ebx, ecx, edx;

		        u32 eax, ebx, ecx, edx, offset;

		        cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx);

			ret = max(ret, eax + ebx);

			offset = compacted ? ret : ebx;

			ret = max(ret, offset + eax);

		}



		xstate_bv >>= 1;
@@ -87,9 +88,13 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu) 
			(best->eax | ((u64)best->edx << 32)) &

			kvm_supported_xcr0();

		vcpu->arch.guest_xstate_size = best->ebx =

			xstate_required_size(vcpu->arch.xcr0);

			xstate_required_size(vcpu->arch.xcr0, false);

	}



	best = kvm_find_cpuid_entry(vcpu, 0xD, 1);

	if (best && (best->eax & (F(XSAVES) | F(XSAVEC))))

		best->ebx = xstate_required_size(vcpu->arch.xcr0, true);



	/*

	 * The existing code assumes virtual address is 48-bit in the canonical

	 * address checks; exit if it is ever changed.
@@ -470,9 +475,14 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, 
				goto out;



			do_cpuid_1_ent(&entry[i], function, idx);

			if (idx == 1)

			if (idx == 1) {

				entry[i].eax &= kvm_supported_word10_x86_features;

			else if (entry[i].eax == 0 || !(supported & mask))

				entry[i].ebx = 0;

				if (entry[i].eax & (F(XSAVES)|F(XSAVEC)))

					entry[i].ebx =

						xstate_required_size(supported,

								     true);

			} else if (entry[i].eax == 0 || !(supported & mask))

				continue;

			entry[i].flags |=

			       KVM_CPUID_FLAG_SIGNIFCANT_INDEX;

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