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KVM: arm64: Add .hyp.data..ro_after_init ELF section

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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
This commit is contained in:
David Brazdil
2020-12-02 18:41:08 +00:00
committed by Marc Zyngier
parent d3e1086c64
commit 2d7bf218ca
4 changed files with 20 additions and 0 deletions
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10
arch/arm64/kernel/vmlinux.lds.S
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@@ -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