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KVM: selftests: riscv: Set PTE A and D bits in VS-stage page table 

Supporting hardware updates of PTE A and D bits is optional for any
RISC-V implementation so current software strategy is to always set
these bits in both G-stage (hypervisor) and VS-stage (guest kernel).

If PTE A and D bits are not set by software (hypervisor or guest)
then RISC-V implementations not supporting hardware updates of these
bits will cause traps even for perfectly valid PTEs.

Based on above explanation, the VS-stage page table created by various
KVM selftest applications is not correct because PTE A and D bits are
not set. This patch fixes VS-stage page table programming of PTE A and
D bits for KVM selftests.

Fixes: 3e06cdf105 ("KVM: selftests: Add initial support for RISC-V
64-bit")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Tested-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2022-04-09 09:15:44 +05:30 committed by Anup Patel
parent 8c3ce496bd
commit fac3725364
1 changed files with 3 additions and 1 deletions
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4
tools/testing/selftests/kvm/include/riscv/processor.h
View File

@ -101,7 +101,9 @@ static inline void set_reg(struct kvm_vm *vm, uint32_t vcpuid, uint64_t id,
#define PGTBL_PTE_WRITE_SHIFT 2
#define PGTBL_PTE_READ_MASK 0x0000000000000002ULL
#define PGTBL_PTE_READ_SHIFT 1
#define PGTBL_PTE_PERM_MASK (PGTBL_PTE_EXECUTE_MASK | \
#define PGTBL_PTE_PERM_MASK (PGTBL_PTE_ACCESSED_MASK | \
PGTBL_PTE_DIRTY_MASK | \
PGTBL_PTE_EXECUTE_MASK | \
PGTBL_PTE_WRITE_MASK | \
PGTBL_PTE_READ_MASK)
#define PGTBL_PTE_VALID_MASK 0x0000000000000001ULL