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| author |   Sean Christopherson <seanjc@google.com> | 2021-12-07 22:09:20 +0000 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-02-10 13:50:33 -0500 |
| commit | bd1ba5732bb954c31e2be07e8ee1397a910835e4 (patch) | |
| tree | 8a6d4f7347bd18c6ec387ed03830577fade53484 /include/asm-generic/hyperv-tlfs.h | |
| parent | KVM: x86/mmu: Consolidate comments about {Host,MMU}-writable (diff) | |
| download | wireguard-linux-bd1ba5732bb954c31e2be07e8ee1397a910835e4.tar.xz wireguard-linux-bd1ba5732bb954c31e2be07e8ee1397a910835e4.zip | |
KVM: x86: Get the number of Hyper-V sparse banks from the VARHEAD field
Get the number of sparse banks from the VARHEAD field, which the guest is
required to provide as "The size of a variable header, in QWORDS.", where
the variable header is:
Variable Header Bytes = {Total Header Bytes - sizeof(Fixed Header)}
rounded up to nearest multiple of 8
Variable HeaderSize = Variable Header Bytes / 8
In other words, the VARHEAD should match the number of sparse banks.
Keep the manual count as a sanity check, but otherwise rely on the field
so as to more closely align with the logic defined in the TLFS and to
allow for future cleanups.
Tweak the tracepoint output to use "rep_cnt" instead of simply "cnt" now
that there is also "var_cnt".
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20211207220926.718794-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/asm-generic/hyperv-tlfs.h')
| -rw-r--r-- | include/asm-generic/hyperv-tlfs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index 8f97c2927bee..b8babc4d3fe4 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -183,6 +183,7 @@ enum HV_GENERIC_SET_FORMAT { #define HV_HYPERCALL_RESULT_MASK GENMASK_ULL(15, 0) #define HV_HYPERCALL_FAST_BIT BIT(16) #define HV_HYPERCALL_VARHEAD_OFFSET 17 +#define HV_HYPERCALL_VARHEAD_MASK GENMASK_ULL(26, 17) #define HV_HYPERCALL_REP_COMP_OFFSET 32 #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32) #define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32) |