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| author |   David Brazdil <dbrazdil@google.com> | 2020-12-02 18:41:08 +0000 |
|---|---|---|
| committer |   Marc Zyngier <maz@kernel.org> | 2020-12-04 10:08:33 +0000 |
| commit | 2d7bf218ca739554bf7277ab0dbfa5399d01f7c6 (patch) | |
| tree | bc3a4579e07a6737c4a7114dacd8114cfcc7648b /arch/arm64/kernel | |
| parent | KVM: arm64: Init MAIR/TCR_EL2 from params struct (diff) | |
| download | linux-dev-2d7bf218ca739554bf7277ab0dbfa5399d01f7c6.tar.xz linux-dev-2d7bf218ca739554bf7277ab0dbfa5399d01f7c6.zip | |
KVM: arm64: Add .hyp.data..ro_after_init ELF section
Add rules for renaming the .data..ro_after_init ELF section in KVM nVHE
object files to .hyp.data..ro_after_init, linking it into the kernel
and mapping it in hyp at runtime.
The section is RW to the host, then mapped RO in hyp. The expectation is
that the host populates the variables in the section and they are never
changed by hyp afterwards.
Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201202184122.26046-13-dbrazdil@google.com
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/vmlinux.lds.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index d6cdcf4aa6a5..43af13968dfd 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_SECTIONS \ + HYP_SECTION_NAME(.data..ro_after_init) : { \ + __hyp_data_ro_after_init_start = .; \ + *(HYP_SECTION_NAME(.data..ro_after_init)) \ + __hyp_data_ro_after_init_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_SECTIONS #define HYPERVISOR_PERCPU_SECTION #endif @@ -234,6 +242,8 @@ SECTIONS _sdata = .; RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) + HYPERVISOR_DATA_SECTIONS + /* * Data written with the MMU off but read with the MMU on requires * cache lines to be invalidated, discarding up to a Cache Writeback |