From: David Brazdil <dbrazdil@google.com>
To: kvmarm@lists.cs.columbia.edu
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Dennis Zhou <dennis@kernel.org>,
Tejun Heo <tj@kernel.org>, Christoph Lameter <cl@linux.com>,
Mark Rutland <mark.rutland@arm.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Quentin Perret <qperret@google.com>,
Andrew Scull <ascull@google.com>,
kernel-team@android.com, David Brazdil <dbrazdil@google.com>
Subject: [RFC PATCH 06/26] kvm: arm64: Add .hyp.data ELF section
Date: Wed, 4 Nov 2020 18:36:10 +0000 [thread overview]
Message-ID: <20201104183630.27513-7-dbrazdil@google.com> (raw)
In-Reply-To: <20201104183630.27513-1-dbrazdil@google.com>
Add rules for renaming a .data ELF section in KVM nVHE object files to
.hyp.data, linking it into the kernel and mapping it in hyp at runtime.
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
arch/arm64/include/asm/sections.h | 1 +
arch/arm64/kernel/vmlinux.lds.S | 10 ++++++++++
arch/arm64/kvm/arm.c | 7 +++++++
arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 3 +++
4 files changed, 21 insertions(+)
diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sections.h
index 3994169985ef..255f76f592d7 100644
--- a/arch/arm64/include/asm/sections.h
+++ b/arch/arm64/include/asm/sections.h
@@ -11,6 +11,7 @@ extern char __alt_instructions[], __alt_instructions_end[];
extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
extern char __hyp_text_start[], __hyp_text_end[];
+extern char __hyp_data_start[], __hyp_data_end[];
extern char __idmap_text_start[], __idmap_text_end[];
extern char __initdata_begin[], __initdata_end[];
extern char __inittext_begin[], __inittext_end[];
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 1bda604f4c70..a9a1612c084f 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -30,6 +30,13 @@ jiffies = jiffies_64;
*(__kvm_ex_table) \
__stop___kvm_ex_table = .;
+#define HYPERVISOR_DATA_SECTION \
+ HYP_SECTION_NAME(.data) : { \
+ __hyp_data_start = .; \
+ *(HYP_SECTION_NAME(.data)) \
+ __hyp_data_end = .; \
+ }
+
#define HYPERVISOR_PERCPU_SECTION \
. = ALIGN(PAGE_SIZE); \
HYP_SECTION_NAME(.data..percpu) : { \
@@ -37,6 +44,7 @@ jiffies = jiffies_64;
}
#else /* CONFIG_KVM */
#define HYPERVISOR_EXTABLE
+#define HYPERVISOR_DATA_SECTION
#define HYPERVISOR_PERCPU_SECTION
#endif
@@ -207,6 +215,8 @@ SECTIONS
EXIT_DATA
}
+ HYPERVISOR_DATA_SECTION
+
PERCPU_SECTION(L1_CACHE_BYTES)
HYPERVISOR_PERCPU_SECTION
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 5750ec34960e..8bb9fffe2a8f 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1602,6 +1602,13 @@ static int init_hyp_mode(void)
goto out_err;
}
+ err = create_hyp_mappings(kvm_ksym_ref(__hyp_data_start),
+ kvm_ksym_ref(__hyp_data_end), PAGE_HYP);
+ if (err) {
+ kvm_err("Cannot map hyp data section\n");
+ goto out_err;
+ }
+
err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
if (err) {
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index bb2d986ff696..bc1664d365a9 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -16,4 +16,7 @@ SECTIONS {
HYP_SECTION_NAME(.data..percpu) : {
PERCPU_INPUT(L1_CACHE_BYTES)
}
+
+ /* Put after '.data..percpu' because its name matches the same regex. */
+ HYP_SECTION(.data)
}
--
2.29.1.341.ge80a0c044ae-goog
next prev parent reply other threads:[~2020-11-04 18:36 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-04 18:36 [RFC PATCH 00/26] kvm: arm64: Always-on nVHE hypervisor David Brazdil
2020-11-04 18:36 ` [RFC PATCH 01/26] psci: Export configured PSCI version David Brazdil
2020-11-05 9:47 ` Marc Zyngier
2020-11-04 18:36 ` [RFC PATCH 02/26] psci: Export configured PSCI function IDs David Brazdil
2020-11-05 9:53 ` Marc Zyngier
2020-11-04 18:36 ` [RFC PATCH 03/26] psci: Export psci_cpu_suspend_feature David Brazdil
2020-11-04 18:36 ` [RFC PATCH 04/26] arm64: Move MAIR_EL1_SET to asm/memory.h David Brazdil
2020-11-04 18:36 ` [RFC PATCH 05/26] kvm: arm64: Initialize MAIR_EL2 using a constant David Brazdil
2020-11-04 18:36 ` David Brazdil [this message]
2020-11-04 18:36 ` [RFC PATCH 07/26] kvm: arm64: Support per_cpu_ptr in nVHE hyp code David Brazdil
2020-11-04 18:36 ` [RFC PATCH 08/26] kvm: arm64: Create nVHE copy of cpu_logical_map David Brazdil
2020-11-04 18:36 ` [RFC PATCH 09/26] kvm: arm64: Move hyp-init params to a per-CPU struct David Brazdil
2020-11-04 18:36 ` [RFC PATCH 10/26] kvm: arm64: Refactor handle_trap to use a switch David Brazdil
2020-11-04 18:36 ` [RFC PATCH 11/26] kvm: arm64: Extract parts of el2_setup into a macro David Brazdil
2020-11-04 18:36 ` [RFC PATCH 12/26] kvm: arm64: Add SMC handler in nVHE EL2 David Brazdil
2020-11-05 11:08 ` Marc Zyngier
2020-11-04 18:36 ` [RFC PATCH 13/26] kvm: arm64: Bootstrap PSCI " David Brazdil
2020-11-04 18:36 ` [RFC PATCH 14/26] kvm: arm64: Forward safe PSCI SMCs coming from host David Brazdil
2020-11-04 18:36 ` [RFC PATCH 15/26] arm64: kvm: Add standalone ticket spinlock implementation for use at hyp David Brazdil
2020-11-04 18:36 ` [RFC PATCH 16/26] kvm: arm64: Add offset for hyp VA <-> PA conversion David Brazdil
2020-11-04 18:36 ` [RFC PATCH 17/26] kvm: arm64: Bootstrap PSCI power state of host CPUs David Brazdil
2020-11-04 18:36 ` [RFC PATCH 18/26] kvm: arm64: Intercept PSCI_CPU_OFF host SMC calls David Brazdil
2020-11-05 11:30 ` Marc Zyngier
2020-11-05 11:42 ` David Brazdil
2020-11-04 18:36 ` [RFC PATCH 19/26] kvm: arm64: Extract __do_hyp_init into a helper function David Brazdil
2020-11-04 18:36 ` [RFC PATCH 20/26] kvm: arm64: Add CPU entry point in nVHE hyp David Brazdil
2020-11-04 18:36 ` [RFC PATCH 21/26] kvm: arm64: Add function to enter host from KVM nVHE hyp code David Brazdil
2020-11-04 18:36 ` [RFC PATCH 22/26] kvm: arm64: Intercept PSCI_CPU_ON host SMC calls David Brazdil
2020-11-04 18:36 ` [RFC PATCH 23/26] kvm: arm64: Intercept host's CPU_SUSPEND PSCI SMCs David Brazdil
2020-11-05 10:34 ` Andrew Walbran
2020-11-05 11:04 ` David Brazdil
2020-11-04 18:36 ` [RFC PATCH 24/26] kvm: arm64: Keep nVHE EL2 vector installed David Brazdil
2020-11-04 18:36 ` [RFC PATCH 25/26] kvm: arm64: Trap host SMCs David Brazdil
2020-11-04 18:36 ` [RFC PATCH 26/26] kvm: arm64: Fix EL2 mode availability checks David Brazdil
2020-11-06 12:25 ` [RFC PATCH 00/26] kvm: arm64: Always-on nVHE hypervisor Marc Zyngier
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