linux-kernel - [PATCH v4 10/10] kvm: arm64: Remove unnecessary hyp mappings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 22 Sep 2020 21:49:10 +0100
From:   David Brazdil <dbrazdil@...gle.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, David Brazdil <dbrazdil@...gle.com>,
        Andrew Scull <ascull@...gle.com>
Subject: [PATCH v4 10/10] kvm: arm64: Remove unnecessary hyp mappings

With all nVHE per-CPU variables being part of the hyp per-CPU region,
mapping them individual is not necessary any longer. They are mapped to hyp
as part of the overall per-CPU region.

Acked-by: Andrew Scull<ascull@...gle.com>
Signed-off-by: David Brazdil <dbrazdil@...gle.com>
---
 arch/arm64/include/asm/kvm_mmu.h | 20 --------------------
 arch/arm64/kvm/arm.c             | 16 ----------------
 2 files changed, 36 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index e134c2ba2c5d..8e7919801196 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -531,21 +531,6 @@ static inline int kvm_map_vectors(void)
 DECLARE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);
 DECLARE_KVM_NVHE_PER_CPU(u64, arm64_ssbd_callback_required);
 
-static inline int hyp_map_aux_data(void)
-{
-	int cpu, err;
-
-	for_each_possible_cpu(cpu) {
-		u64 *ptr;
-
-		ptr = per_cpu_ptr_nvhe_sym(arm64_ssbd_callback_required, cpu);
-		err = create_hyp_mappings(ptr, ptr + 1, PAGE_HYP);
-		if (err)
-			return err;
-	}
-	return 0;
-}
-
 static inline void hyp_init_aux_data(void)
 {
 	u64 *ptr;
@@ -555,11 +540,6 @@ static inline void hyp_init_aux_data(void)
 	*ptr = __this_cpu_read(arm64_ssbd_callback_required);
 }
 #else
-static inline int hyp_map_aux_data(void)
-{
-	return 0;
-}
-
 static inline void hyp_init_aux_data(void) {}
 #endif
 
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index cd5293e55fec..22ec7176f95b 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1591,22 +1591,6 @@ static int init_hyp_mode(void)
 		}
 	}
 
-	for_each_possible_cpu(cpu) {
-		kvm_host_data_t *cpu_data;
-
-		cpu_data = per_cpu_ptr_hyp_sym(kvm_host_data, cpu);
-		err = create_hyp_mappings(cpu_data, cpu_data + 1, PAGE_HYP);
-
-		if (err) {
-			kvm_err("Cannot map host CPU state: %d\n", err);
-			goto out_err;
-		}
-	}
-
-	err = hyp_map_aux_data();
-	if (err)
-		kvm_err("Cannot map host auxiliary data: %d\n", err);
-
 	return 0;
 
 out_err:
-- 
2.28.0.681.g6f77f65b4e-goog