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ANDROID: KVM: arm64: Add vcpu flag copy primitive

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Contrary to vanilla KVM, pKVM not only deals with flags in a vcpu,
but also synchronises them across host and hypervisor views of the same
vcpu.

Most of the time, this is about copying flags from one vcpu structure
to another, so let's offer a primitive that does this.

Bug: 357781595
Change-Id: Icd67b617c1cd69706ccd99739756458864b422bb
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
This commit is contained in:
Marc Zyngier
2022-06-11 11:50:23 +01:00
committed by Keir Fraser
parent 8ddceb7f75
commit ac89f51eaf
1 changed files with 16 additions and 0 deletions
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arch/arm64/include/asm/kvm_host.h
+16
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@@ -850,9 +850,25 @@ struct kvm_vcpu_arch {
__vcpu_flags_preempt_enable(); \
} while (0)
#define __vcpu_copy_flag(vt, vs, flagset, f, m) \
do { \
typeof(vs->arch.flagset) tmp, val; \
\
__build_check_flag(vs, flagset, f, m); \
\
val = READ_ONCE(vs->arch.flagset); \
val &= (m); \
tmp = READ_ONCE(vt->arch.flagset); \
tmp &= ~(m); \
tmp |= val; \
WRITE_ONCE(vt->arch.flagset, tmp); \
} while (0)
#define vcpu_get_flag(v, ...) __vcpu_get_flag((v), __VA_ARGS__)
#define vcpu_set_flag(v, ...) __vcpu_set_flag((v), __VA_ARGS__)
#define vcpu_clear_flag(v, ...) __vcpu_clear_flag((v), __VA_ARGS__)
#define vcpu_copy_flag(vt, vs, ...) __vcpu_copy_flag((vt), (vs), __VA_ARGS__)
/* SVE exposed to guest */
#define GUEST_HAS_SVE __vcpu_single_flag(cflags, BIT(0))