linux-kernel - [RFC 17/19] KVM: x86/mmu: Add try_get_mt_mask to x86

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Message-Id: <20211110223010.1392399-18-bgardon@google.com>
Date:   Wed, 10 Nov 2021 14:30:08 -0800
From:   Ben Gardon <bgardon@...gle.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Peter Shier <pshier@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>,
        Kai Huang <kai.huang@...el.com>,
        Keqian Zhu <zhukeqian1@...wei.com>,
        David Hildenbrand <david@...hat.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: [RFC 17/19] KVM: x86/mmu: Add try_get_mt_mask to x86_ops

Add another function for getting the memory type mask to x86_ops.
This version of the function can fail, but it does not require a vCPU
pointer. It will be used in a subsequent commit for in-place large page
promotion when disabling dirty logging.

No functional change intended.


Signed-off-by: Ben Gardon <bgardon@...gle.com>
---
 arch/x86/include/asm/kvm-x86-ops.h | 1 +
 arch/x86/include/asm/kvm_host.h    | 2 ++
 arch/x86/kvm/svm/svm.c             | 8 ++++++++
 arch/x86/kvm/vmx/vmx.c             | 1 +
 4 files changed, 12 insertions(+)

diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index cefe1d81e2e8..c86e9629ff1a 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -84,6 +84,7 @@ KVM_X86_OP_NULL(sync_pir_to_irr)
 KVM_X86_OP(set_tss_addr)
 KVM_X86_OP(set_identity_map_addr)
 KVM_X86_OP(get_mt_mask)
+KVM_X86_OP(try_get_mt_mask)
 KVM_X86_OP(load_mmu_pgd)
 KVM_X86_OP_NULL(has_wbinvd_exit)
 KVM_X86_OP(get_l2_tsc_offset)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 88fce6ab4bbd..ae13075f4d4c 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1400,6 +1400,8 @@ struct kvm_x86_ops {
 	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 	int (*set_identity_map_addr)(struct kvm *kvm, u64 ident_addr);
 	u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
+	bool (*try_get_mt_mask)(struct kvm *kvm, gfn_t gfn,
+				bool is_mmio, u64 *mask);
 
 	void (*load_mmu_pgd)(struct kvm_vcpu *vcpu, hpa_t root_hpa,
 			     int root_level);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 21bb81710e0f..d073cc3985e6 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4067,6 +4067,13 @@ static bool svm_has_emulated_msr(struct kvm *kvm, u32 index)
 	return true;
 }
 
+static bool svm_try_get_mt_mask(struct kvm *kvm, gfn_t gfn,
+				bool is_mmio, u64 *mask)
+{
+	*mask = 0;
+	return true;
+}
+
 static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
 {
 	return 0;
@@ -4660,6 +4667,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.set_tss_addr = svm_set_tss_addr,
 	.set_identity_map_addr = svm_set_identity_map_addr,
 	.get_mt_mask = svm_get_mt_mask,
+	.try_get_mt_mask = svm_try_get_mt_mask,
 
 	.get_exit_info = svm_get_exit_info,
 
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 4129614262e8..8cd6c1f50d3e 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7658,6 +7658,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.set_tss_addr = vmx_set_tss_addr,
 	.set_identity_map_addr = vmx_set_identity_map_addr,
 	.get_mt_mask = vmx_get_mt_mask,
+	.try_get_mt_mask = vmx_try_get_mt_mask,
 
 	.get_exit_info = vmx_get_exit_info,
 
-- 
2.34.0.rc0.344.g81b53c2807-goog