Thread (79 messages) 79 messages, 4 authors, 2026-03-06

Re: [PATCH v9 12/30] KVM: arm64: Rename sve_state_reg_region

From: Fuad Tabba <tabba@google.com>
Date: 2026-01-09 15:56:22
Also in: kvm, kvmarm, linux-arm-kernel, linux-kselftest, lkml

On Tue, 23 Dec 2025 at 01:22, Mark Brown [off-list ref] wrote:
quoted hunk ↗ jump to hunk
As for SVE we will need to pull parts of dynamically sized registers out of
a block of memory for SME so we will use a similar code pattern for this.
Rename the current struct sve_state_reg_region in preparation for this.

No functional change.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 arch/arm64/kvm/guest.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index d15aa2da1891..8c3405b5d7b1 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -404,9 +404,9 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
  */
 #define vcpu_sve_slices(vcpu) 1

-/* Bounds of a single SVE register slice within vcpu->arch.sve_state */
-struct sve_state_reg_region {
-       unsigned int koffset;   /* offset into sve_state in kernel memory */
+/* Bounds of a single register slice within vcpu->arch.s[mv]e_state */
nit: I'm not sure that the space saving of s[mv]e_state is worth the
added difficulty or reading compared with writing sve_state/sme_state

That said:
Reviewed-by: Fuad Tabba <tabba@google.com>

Cheers,
/fuad


quoted hunk ↗ jump to hunk
+struct vec_state_reg_region {
+       unsigned int koffset;   /* offset into s[mv]e_state in kernel memory */
        unsigned int klen;      /* length in kernel memory */
        unsigned int upad;      /* extra trailing padding in user memory */
 };
@@ -415,7 +415,7 @@ struct sve_state_reg_region {
  * Validate SVE register ID and get sanitised bounds for user/kernel SVE
  * register copy
  */
-static int sve_reg_to_region(struct sve_state_reg_region *region,
+static int sve_reg_to_region(struct vec_state_reg_region *region,
                             struct kvm_vcpu *vcpu,
                             const struct kvm_one_reg *reg)
 {
@@ -485,7 +485,7 @@ static int sve_reg_to_region(struct sve_state_reg_region *region,
 static int get_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 {
        int ret;
-       struct sve_state_reg_region region;
+       struct vec_state_reg_region region;
        char __user *uptr = (char __user *)reg->addr;

        /* Handle the KVM_REG_ARM64_SVE_VLS pseudo-reg as a special case: */
@@ -511,7 +511,7 @@ static int get_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 static int set_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 {
        int ret;
-       struct sve_state_reg_region region;
+       struct vec_state_reg_region region;
        const char __user *uptr = (const char __user *)reg->addr;

        /* Handle the KVM_REG_ARM64_SVE_VLS pseudo-reg as a special case: */

--
2.47.3
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