diff options
| author | Akihiko Odaki <akihiko.odaki@daynix.com> | 2023-01-12 11:38:52 +0900 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-01-21 18:09:23 +0000 |
| commit | 7af0c2534f4c57b16e92dfca8c5f40fa90fbb3f3 (patch) | |
| tree | 81a282bcae6f2429eddee8f0a2dc07c8b862d378 /arch/arm64/include | |
| parent | bf48040cd9b0c4d93c635ce222014a594e4e93f2 (diff) | |
KVM: arm64: Normalize cache configuration
Before this change, the cache configuration of the physical CPU was
exposed to vcpus. This is problematic because the cache configuration a
vcpu sees varies when it migrates between vcpus with different cache
configurations.
Fabricate cache configuration from the sanitized value, which holds the
CTR_EL0 value the userspace sees regardless of which physical CPU it
resides on.
CLIDR_EL1 and CCSIDR_EL1 are now writable from the userspace so that
the VMM can restore the values saved with the old kernel.
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Link: https://lore.kernel.org/r/20230112023852.42012-8-akihiko.odaki@daynix.com
[ Oliver: Squash Marc's fix for CCSIDR_EL1.LineSize when set from userspace ]
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/cache.h | 3 | ||||
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h index ab7133654a72..a51e6e8f3171 100644 --- a/arch/arm64/include/asm/cache.h +++ b/arch/arm64/include/asm/cache.h @@ -22,6 +22,9 @@ #define CLIDR_CTYPE(clidr, level) \ (((clidr) & CLIDR_CTYPE_MASK(level)) >> CLIDR_CTYPE_SHIFT(level)) +/* Ttypen, bits [2(n - 1) + 34 : 2(n - 1) + 33], for n = 1 to 7 */ +#define CLIDR_TTYPE_SHIFT(level) (2 * ((level) - 1) + CLIDR_EL1_Ttypen_SHIFT) + /* * Memory returned by kmalloc() may be used for DMA, so we must make * sure that all such allocations are cache aligned. Otherwise, diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 374390a9212e..496602e0b299 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -252,6 +252,7 @@ struct kvm_vcpu_fault_info { enum vcpu_sysreg { __INVALID_SYSREG__, /* 0 is reserved as an invalid value */ MPIDR_EL1, /* MultiProcessor Affinity Register */ + CLIDR_EL1, /* Cache Level ID Register */ CSSELR_EL1, /* Cache Size Selection Register */ SCTLR_EL1, /* System Control Register */ ACTLR_EL1, /* Auxiliary Control Register */ @@ -501,6 +502,9 @@ struct kvm_vcpu_arch { u64 last_steal; gpa_t base; } steal; + + /* Per-vcpu CCSIDR override or NULL */ + u32 *ccsidr; }; /* |