github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-01 19:13:47 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

RISC-V: KVM: Introduce feature specific reset for SBI FWFT

Browse Source 
The SBI FWFT feature values must be reset upon VCPU reset so
introduce feature specific reset callback for this purpose.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Link: https://lore.kernel.org/r/20250823155947.1354229-3-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2025-08-23 21:29:43 +05:30 committed by Anup Patel
parent 83df1d64d6
commit a6250b18b5
1 changed files with 28 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
arch/riscv/kvm/vcpu_sbi_fwft.c
View File

@ -30,6 +30,13 @@ struct kvm_sbi_fwft_feature {
*/
bool (*supported)(struct kvm_vcpu *vcpu);
/**
* @reset: Reset the feature value irrespective whether feature is supported or not
*
* This callback is mandatory
*/
void (*reset)(struct kvm_vcpu *vcpu);
/**
* @set: Set the feature value
*
@ -75,6 +82,13 @@ static bool kvm_sbi_fwft_misaligned_delegation_supported(struct kvm_vcpu *vcpu)
return misaligned_traps_can_delegate();
}
static void kvm_sbi_fwft_reset_misaligned_delegation(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_config *cfg = &vcpu->arch.cfg;
cfg->hedeleg &= ~MIS_DELEG;
}
static long kvm_sbi_fwft_set_misaligned_delegation(struct kvm_vcpu *vcpu,
struct kvm_sbi_fwft_config *conf,
unsigned long value)
@ -124,6 +138,11 @@ static bool kvm_sbi_fwft_pointer_masking_pmlen_supported(struct kvm_vcpu *vcpu)
return fwft->have_vs_pmlen_7 || fwft->have_vs_pmlen_16;
}
static void kvm_sbi_fwft_reset_pointer_masking_pmlen(struct kvm_vcpu *vcpu)
{
vcpu->arch.cfg.henvcfg &= ~ENVCFG_PMM;
}
static long kvm_sbi_fwft_set_pointer_masking_pmlen(struct kvm_vcpu *vcpu,
struct kvm_sbi_fwft_config *conf,
unsigned long value)
@ -189,6 +208,7 @@ static const struct kvm_sbi_fwft_feature features[] = {
{
.id = SBI_FWFT_MISALIGNED_EXC_DELEG,
.supported = kvm_sbi_fwft_misaligned_delegation_supported,
.reset = kvm_sbi_fwft_reset_misaligned_delegation,
.set = kvm_sbi_fwft_set_misaligned_delegation,
.get = kvm_sbi_fwft_get_misaligned_delegation,
},
@ -196,6 +216,7 @@ static const struct kvm_sbi_fwft_feature features[] = {
{
.id = SBI_FWFT_POINTER_MASKING_PMLEN,
.supported = kvm_sbi_fwft_pointer_masking_pmlen_supported,
.reset = kvm_sbi_fwft_reset_pointer_masking_pmlen,
.set = kvm_sbi_fwft_set_pointer_masking_pmlen,
.get = kvm_sbi_fwft_get_pointer_masking_pmlen,
},
@ -330,11 +351,16 @@ static void kvm_sbi_ext_fwft_deinit(struct kvm_vcpu *vcpu)
static void kvm_sbi_ext_fwft_reset(struct kvm_vcpu *vcpu)
{
int i;
struct kvm_sbi_fwft *fwft = vcpu_to_fwft(vcpu);
const struct kvm_sbi_fwft_feature *feature;
int i;
for (i = 0; i < ARRAY_SIZE(features); i++)
for (i = 0; i < ARRAY_SIZE(features); i++) {
fwft->configs[i].flags = 0;
feature = &features[i];
if (feature->reset)
feature->reset(vcpu);
}
}
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_fwft = {