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KVM: arm64: Introduce data structure tracking both RES0 and RES1 bits

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We have so far mostly tracked RES0 bits, but only made a few attempts
at being just as strict for RES1 bits (probably because they are both
rarer and harder to handle).

Start scratching the surface by introducing a data structure tracking
RES0 and RES1 bits at the same time.

Note that contrary to the usual idiom, this structure is mostly passed
around by value -- the ABI handles it nicely, and the resulting code is
much nicer.

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-5-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier
2026-02-02 18:43:13 +00:00
parent a3c9200181
commit 0879478913
3 changed files with 161 additions and 139 deletions
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23
arch/arm64/include/asm/kvm_host.h
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@@ -626,13 +626,24 @@ enum vcpu_sysreg {
NR_SYS_REGS /* Nothing after this line! */
};
struct kvm_sysreg_masks {
struct {
u64 res0;
u64 res1;
} mask[NR_SYS_REGS - __SANITISED_REG_START__];
struct resx {
u64 res0;
u64 res1;
};
struct kvm_sysreg_masks {
struct resx mask[NR_SYS_REGS - __SANITISED_REG_START__];
};
static inline void __kvm_set_sysreg_resx(struct kvm_arch *arch,
enum vcpu_sysreg sr, struct resx resx)
{
arch->sysreg_masks->mask[sr - __SANITISED_REG_START__] = resx;
}
#define kvm_set_sysreg_resx(k, sr, resx) \
__kvm_set_sysreg_resx(&(k)->arch, (sr), (resx))
struct fgt_masks {
const char *str;
u64 mask;
@@ -1607,7 +1618,7 @@ static inline bool kvm_arch_has_irq_bypass(void)
}
void compute_fgu(struct kvm *kvm, enum fgt_group_id fgt);
void get_reg_fixed_bits(struct kvm *kvm, enum vcpu_sysreg reg, u64 *res0, u64 *res1);
struct resx get_reg_fixed_bits(struct kvm *kvm, enum vcpu_sysreg reg);
void check_feature_map(void);
void kvm_vcpu_load_fgt(struct kvm_vcpu *vcpu);