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| author |  Andrew Jones <ajones@ventanamicro.com>
| 2023-12-20 17:00:19 +0100 |
|---|---|---|
| committer |  Anup Patel <anup@brainfault.org>
| 2023-12-30 11:26:26 +0530 |
| commit | 38b3390ee4880140b6245fe3273fe9ce53f65bde (patch) | |
| tree | 66c6a64af72cdecd051cf7b5bb5d17c582ef278c /arch/riscv/kvm | |
| parent | RISC-V: KVM: Add steal-update vcpu request (diff) | |
| download | linux-38b3390ee4880140b6245fe3273fe9ce53f65bde.tar.gz linux-38b3390ee4880140b6245fe3273fe9ce53f65bde.tar.bz2 linux-38b3390ee4880140b6245fe3273fe9ce53f65bde.zip | |
RISC-V: KVM: Add SBI STA info to vcpu_arch
KVM's implementation of SBI STA needs to track the address of each
VCPU's steal-time shared memory region as well as the amount of
stolen time. Add a structure to vcpu_arch to contain this state
and make sure that the address is always set to INVALID_GPA on
vcpu reset. And, of course, ensure KVM won't try to update steal-
time when the shared memory address is invalid.
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv/kvm')
| -rw-r--r-- | arch/riscv/kvm/vcpu.c | 2 | ||||
| -rw-r--r-- | arch/riscv/kvm/vcpu_sbi_sta.c | 10 |
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 6995b8b641e4..b5ca9f2e98ac 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -83,6 +83,8 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu) vcpu->arch.hfence_tail = 0; memset(vcpu->arch.hfence_queue, 0, sizeof(vcpu->arch.hfence_queue)); + kvm_riscv_vcpu_sbi_sta_reset(vcpu); + /* Reset the guest CSRs for hotplug usecase */ if (loaded) kvm_arch_vcpu_load(vcpu, smp_processor_id()); diff --git a/arch/riscv/kvm/vcpu_sbi_sta.c b/arch/riscv/kvm/vcpu_sbi_sta.c index e28351c9488b..6592d287fc4e 100644 --- a/arch/riscv/kvm/vcpu_sbi_sta.c +++ b/arch/riscv/kvm/vcpu_sbi_sta.c @@ -8,8 +8,18 @@ #include <asm/kvm_vcpu_sbi.h> #include <asm/sbi.h> +void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu) +{ + vcpu->arch.sta.shmem = INVALID_GPA; + vcpu->arch.sta.last_steal = 0; +} + void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu) { + gpa_t shmem = vcpu->arch.sta.shmem; + + if (shmem == INVALID_GPA) + return; } static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu) |